THE HISTORICAL
MARKER DATABASE
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2199 entries match your criteria. Entries 401 through 500 are listed. ⊲ Previous 100 — Next 100 ⊳

 
 

Natural Features Topic

 
By Don Morfe, November 7, 2008
View from the Visitor Center
401 ► Hawaii, Maui County, Hana — Haleakala National Park — Kipahulu: Costal District —
The landscape of Haleakala National Park rises from a lush valley beneath a waterfall at sea level to a red desert of cinder cones here at the volcanic summit of Haleakala. An astounding array of climates and life zones lies in between. Yet the . . . — — Map (db m62199) HM
402 ► Hawaii, Maui County, Hana, Kipahulu — Ma Ka Hana Ka 'Ike / Insight Through Experience —
In 1848 under Kang Kamehameha III, the Mahele (divide) privatized land for the first time in Hawai'i. The changes wrought by the Mahele are still felt today. Maka'aiana (common people) were allowed to apply for ownership of kuleana (small . . . — — Map (db m292635) HM
403 ► Hawaii, Maui County, Hana, Kipahulu — 'Ike Aku, 'Ike Mai, Kokua Aku, Kokua Mai, Pela Ka Nohona 'Ohana — Haleakāla National Park — National Park Service, U.S. Department of the Interior —
The Kipahulu District protects multiple intact ahupua'a, traditional land divisions that protect natural resources from mauka to makai (mountain to sea). Boundaries were often along streams and ridges and were marked by ahu (alter) with a pua'a . . . — — Map (db m292633) HM
404 ► Hawaii, Maui County, Kaanapali — The Stones of Moemoe and Wahine O Manua — Ka'anapali Historical Trail —
The Stones of Moemoe and Wahine O Manua These two large pohaku (stones) are steeped in legend. The larger one is over six feet long and resembles a reclining person. It is called Moemoe (to lie in wait or sleep). The taller stone sheltered an abused . . . — — Map (db m290120) HM
405 ► Hawaii, Maui County, Kula — Haleakalā National Park — Summit District —
The landscape of Haleakalā National Park rises from a lush valley beneath a waterfall at sea level to a red desert of cinder cones here at the volcanic summit of Haleakala. An astounding array of climates and life zones lies in between. Yet the . . . — — Map (db m71753) HM
406 ► Hawaii, Maui County, Wailuku — Kūka‘emoku — [ʻĪao Valley] —
Commonly called ʻĪao Needle, the traditional Hawaiian name for this 2,250 foot high peak is Kūka‘emoku. This peak is known as the phallic stone of Kanaloa, Hawaiian god of the ocean. During periods of warfare, the peak was . . . — — Map (db m31540) HM
407 ► Hawaii, Maui County, Wailuku — Kūka'emoku - 'Īao Needle —
The traditional name for this 2,250 foot high peak is Küka'emoku. The peak is known as the phallic stone of Kanaloa, Hawaiian god of the ocean. During periods of warfare, the peak was used as a lookout by warriors. It was here that some of . . . — — Map (db m292777) HM
408 ► Hawaii, Maui County, Wailuku — Ka Wai Ola O Kāne (The Living Waters of Kāne) —
Iao translates as "cloud supreme" and refers to the bank of clouds that often sits over the valley. These clouds bring the frequent rains that feed the streams. It is these waters that carved this landscape over the past 1.5 million years. . . . — — Map (db m292783) HM
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409 ► Hawaii, Maui County, Wailuku — Ko Lalo Kuilani Aloha —
Blessings of Leeward Life The giant ocean nursery before you, Ma'alaea Bay, lies us the cradle of Maui's leeward coast, to your left. This sheltered coast is often called South Maui. It boasts of rich seas, accessible beaches, and the . . . — — Map (db m293183) HM
410 ► Idaho, Ada County, Meridian — 193 — Initial Point —
All Idaho land surveys refer to a beginning point --"Initial Point"-- 16 miles directly south of here. When he began surveying Idaho in 1867, Lafayette Cartee, first surveyor general of Idaho Territory, established the initial point on a . . . — — Map (db m53439) HM
411 ► Idaho, Bannock County, Downey — 171 — Red Rock Pass —
You are standing in the outlet of ancient Lake Bonneville, a vast prehistoric inland sea, of which Salt Lake is modern remnant Covering over 20,000 square miles when it overflowed here about 14,500 years ago, its winding shoreline would have . . . — — Map (db m105831) HM
412 ► Idaho, Bannock County, Lava Hot Springs — 13 — Lava Hot Springs —
Long before white men discovered these springs, Sept. 9, 1812, Indians gathered here to use the free hot water. Except wheen they found hot springs, pre-historic Indians had a hard time getting hot water. The wove watertight baskets into . . . — — Map (db m124585) HM
413 ► Idaho, Bannock County, Lava Hot Springs — Lava Hot Springs' healing waters —
(This marker is composed of series of photographs and their captions.) Good for what ails you! Idaho's hot springs have drawn people to them for hundreds, if not thousands, of years. Long before indoor plumbing and hot water . . . — — Map (db m108255) HM
414 ► Idaho, Bannock County, Pocatello — Pocatello — Area Geology —
Portneuf Narrows — The Portneuf River cuts through a weak spot in the Bannock Range near a fault that formed 100 million years ago, during development of the Idaho – Wyoming thrust belt. Rocks north of the Narrows have been turned upside down . . . — — Map (db m267796) HM
415 ► Idaho, Bannock County, Pocatello — Volcanic Activity Near Pocatello —
Some 600,000 years ago, basalt lava at 2000 degrees Fahrenheit flowed down the Portneuf River canyon from vents near Bancroft in Gem Valley. Two flows, advancing up to several miles per day, travelled the 60 miles to Ross Park in southern . . . — — Map (db m267797) HM
416 ► Idaho, Bannock County, Pocatello — Why is Portneuf Gap Here? — Portneuf Gap-Gittins Cutoff Historic Loop —
This canyon was cut by the ancestral Bear River around a million years ago. The canyon cuts across the north-south trend of the Bannock Range, following the trend of an east-west fault that formed about 100 million years ago during formation of the . . . — — Map (db m267595)
417 ► Idaho, Bingham County, Blackfoot — 436 — Big Butte —
Towering 2500 feet high, two over lapping rock domes form a 300,000 year-old butte that dominates this lava plain. After a hot flow of molten rhyolite (acidic rock) boiled up through older lava, a second rhyolite dome pushed up a block . . . — — Map (db m103820) HM
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418 ► Idaho, Bingham County, Blackfoot — 287 — Lava Formations —
Molten rock, forced upward for 30 to 50 miles through fissures in the earth, has cooled into the hard lava found here. Continued pressure from below has made great cracks in the contorted surface. This lava solidified only a few thousand . . . — — Map (db m108346) HM
419 ► Idaho, Bingham County, Blackfoot — 428 — Three Buttes —
Rising above this level plain of lava flows and windblown soils these high landmarks are recent additions to Idaho’s landscape. East Butte (farthest east) flowed up and cooled quickly about 600,000 years ago, while Big Southern Butte . . . — — Map (db m103818) HM
420 ► Idaho, Blaine County, Bellevue — Timmerman Junction Oregon Trail Kiosk —
(Five panels in the kiosk deal with the history of Goodale's Cutoff and the surrounding area) Idaho's Emigrant Trails Westward-bound emigrants entered Idaho after crossing Thomas Fork Valley. They soon encountered the climb . . . — — Map (db m110138) HM
421 ► Idaho, Blaine County, Ketchum — 292 — Salmon River —
Rising as a small stream in the valley to the south, the Salmon winds 420 miles across Idaho before flowing into Snake River. Discovered in 1895 by Lewis and Clark, and explored with great difficulty by fur traders and prospectors, the . . . — — Map (db m110050) HM
422 ► Idaho, Boundary County, Bonners Ferry — 321 — Glacial Lakes —
Moving from the north down this valley, the edge of the continental ice sheet blocked rivers and formed glacial lakes. Then as the ice gradually melted, a lake rose here behind the receding ice dam, and extended up Kootenai valley into . . . — — Map (db m122174) HM
423 ► Idaho, Boundary County, Bonners Ferry — Moyie River Canyon —
[front side] Constructed in 1964, the 1223 ft. long steel truss bridge spans the Moyie River Canyon at a height of 464 ft. It replaces the old bridge built in 1923 and 1¼ miles of narrow, winding highway. It is the second highest bridge in . . . — — Map (db m73505) HM
424 ► Idaho, Butte County, Arco — A Plain of Volcanoes —
The shallow arc of Idaho’s Snake River Plain spans southern Idaho, gently rising from west to east. Current theories suggest that the plain marks the path of continental movement over a deep hotspot now lying beneath the Yellowstone Plateau. As the . . . — — Map (db m71602)
425 ► Idaho, Butte County, Arco — Are We Loving Them to Death? —
Walking off trails may be destroying these spatter cones which are some of the rarest volcanic features on the face of the earth. Photographs taken at different times demonstrate that unrestricted visitor use left these fragile volcanic cones . . . — — Map (db m80429) HM
426 ► Idaho, Butte County, Arco — Big Cinder Butte —
On old maps, this region was referred to as "the Cinder Buttes." Towering above the surrounding landscape by more than 700 feet (200 meters) and spreading across an area of more than three square miles (eight square kilometers) the tallest and . . . — — Map (db m140015) HM
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427 ► Idaho, Butte County, Arco — Boy Scout Cave — Craters of the Moon National Monument and Preserve —
Look for lava and ice stalactites ("lavacicles" and "icicles") on the ceiling and walls of this lava tube. They were formed by dripping hot lava and melting ice. Born of fire, this cave now retains ice year-round—a cool place to visit on a hot . . . — — Map (db m92943)
428 ► Idaho, Butte County, Arco — Goodale's Cutoff —
Beginning in the 1850s, armed skirmishes broke out between Shoshone Indians and emigrants traveling by wagon train to the west. Many pioneers tried new paths through Idaho that would avoid the Snake River, where they were most vulnerable to attack. . . . — — Map (db m140017) HM
429 ► Idaho, Butte County, Arco — Indian Tunnel — Craters of the Moon National Monument and Preserve —
Indian Tunnel is named for the mysterious stone circles that lie near the path to this large lava tube. Ancient stone structures are visible in many locations throughout the Monument. Archeologists believe that some of these structures may have had . . . — — Map (db m183501)
430 ► Idaho, Butte County, Arco — Just Down the Road — Craters of the Moon National Monument —
The Strangest 75 square miles on the North American continent Comment from an early traveler The landscape before you was explosively created by volcanic eruptions. Cracks in the earth's crust allowed lava to blast, plop, . . . — — Map (db m92942)
431 ► Idaho, Butte County, Arco — Silent Cone —
This silent volcano made some noise approximately 6,500 years ago when eruptions ejected cinders and pumped out lava from the crater. Today, the shady north-facing slope of this cinder cone supports a forest of Limber pines and a few larger . . . — — Map (db m140026) HM
432 ► Idaho, Butte County, Arco — Vanishing Landmark —
From this vantage point, you gaze across 25 miles of lava to Big Southern Butte. Early pioneers, following Goodale’s Cutoff from the Oregon Trail, used this land mark to navigate around the rugged lavas of the Snake River Plain. As a traveler today, . . . — — Map (db m70595) HM
433 ► Idaho, Butte County, Arco — Volcanoes Along the Rift —
Before you lies the Great Rift, a 52-mile (84 kilometer) long system of fissures which a chain of volcanoes erupted. Crescent Butte is the oldest of these cinder cones, created during the earliest eruptions here about 15,000 years ago. North . . . — — Map (db m140027) HM
434 ► Idaho, Butte County, Arco — Where's the Volcano? —
Say the word volcano and usually the image flashes to mind of a single great symmetrical cone. But, the volcanic activity in Craters of the Moon National Monument and the Snake River Plain has taken a different form. Parallel cracks in the . . . — — Map (db m71601)
435 ► Idaho, Butte County, Howe — 227 — John Day’s River —
Fur traders named this stream for John Day, a pioneer trapper who died in the valley north of here, Feb. 16, 1820 John Day had started west with John Jacob Astor’s Pacific Fur Company that discovered Snake River Valley to the south of . . . — — Map (db m103827) HM
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436 ► Idaho, Caribou County, Grace — Black Canyon Gorge —
Bear River has its source in lakes on the north slope of Hayden Peak, 12,485 feet in elevation, near the western limit of Utah's high Uintas. The horseshoe shaped river follows a course 500 miles long, but its mouth is only 90 miles from its source. . . . — — Map (db m140343) HM
437 ► Idaho, Caribou County, Grace — Lava Flows and Wagon Trains —
Geological processes created the complex landscape of southeastern Idaho and eventually determined the routes covered wagons would take along the Oregon Trail. In their journals, trail emigrants often wrote something about the two volcanic cinder . . . — — Map (db m140253) HM
438 ► Idaho, Caribou County, Soda Springs — "It Roars Like a Mad Dragon" — S.E. Matthews, Soda Springs Geyer Corporation, December 1937 —
Many Oregon & California bound emigrants mention seeing ten to twelve foot hight white mounds and cones in their diaries and journals while passing through the Soda Springs area in the mid-1800s. Often, one of the first natural curiosities that . . . — — Map (db m106251) HM
439 ► Idaho, Caribou County, Soda Springs — 220 — Bear River Lava —
Until about 28,000 years ago, Bear River used to flow northwest from here through Portneuf Canyon into Snake River. Then these lava eruption blocked that route, diverting Bear River south into what now is Salt Lake. At that time a . . . — — Map (db m106728) HM
440 ► Idaho, Caribou County, Soda Springs — 260 — Brigham Young Summer Home —
On this site in 1870, the first house in Soda Springs, Uppertown was built under the direction of John Walmsley. It was a one room log cabin twenty-two by eighteen feet, with floor, windows, and shingle roof, known as the Brigham Young Summer Home. . . . — — Map (db m35466) HM
441 ► Idaho, Caribou County, Soda Springs — China Hat Geological Site —
Noticeable for their distinct shapes, China Hat and nearby China Cap are rhyolite domes that intruded and pierced the basalt of the Blackfoot Lava Field. The basaltic phase of this volcanic province was active in middle Pleistocene around 500,000 . . . — — Map (db m105966) HM
442 ► Idaho, Caribou County, Soda Springs — Coach History —
In 1958, Dr. Evan and Lois Kackley donated the Yellowstone Coach to the City of Soda Springs. According to Dr. Kackley's written letters to the city council he stated, "This particular coach was used to carry Pres. Theodore Roosevelt and the . . . — — Map (db m106694) HM
443 ► Idaho, Caribou County, Soda Springs — Guiding Landmark... — Sheep Rock —
Towering 1200 feet above the waters of Bear River is Sheep Rock, a prominent landmark described in emigrant diaries and journals as they traveled west on the Oregon and California trails. Trapper and mountain men, in the early 1830s, indicate that a . . . — — Map (db m106737) HM
444 ► Idaho, Caribou County, Soda Springs — 385 — Hooper Spring —
Free clear sparkling soda water still is available in a beautiful Soda Springs city park located 2 miles from here. A prime attraction for more than 160 years, soda water from these springs was marketed nationally after rail service . . . — — Map (db m106256) HM
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445 ► Idaho, Caribou County, Soda Springs — Sheep Rock Geology —
Lava eruptions west of Sheep Rock at least 140,000 years ago blocked the Bear River from draining into the Snake River system. Instead, the Bear was forced to drain into what was then Lakes Thatcher and Bonneville to the south. The Bear River's . . . — — Map (db m106847) HM
446 ► Idaho, Caribou County, Soda Springs — 158 — Soda Springs —
In this area are a group of springs famous to Oregon Trail travelers, most of whom stopped to try the "acid taste and effervessing gasses" of the waters. Earlier, fur traders often -- less elegantly -- called the place "Beer Springs" . . . — — Map (db m105967) HM
447 ► Idaho, Caribou County, Soda Springs — Travertine Terraces - World Famous Water —
The gently sloping mound around the geyser is travertine. The stone often develops into flights of pools enclosed within little dams. These dams form through a mix of water and carbon dioxide which makes carbonic acid, and dissolved calcium . . . — — Map (db m109952) HM
448 ► Idaho, Caribou County, Wayan — 433 — Cariboo Mountain —
Rising to an elevation of more than 9,800 feet, Cariboo Mountain -- visible north of here -- has two of Idaho's highest gold camps. Jesse "Cariboo Jack" Fairchild discovered gold high on Cariboo Mountain in August, 1870, and a mining rush . . . — — Map (db m105965) HM
449 ► Idaho, Cassia County, Almo — Distant Views —
This vast scene holds many intriguing stories. If the land could speak, it would tell of pioneers and wagons crossing the wide Ralf River Valley from Strevell Pass to Emigrant Canyon bound for California in 1843-1882. The land would speak of stage . . . — — Map (db m123956) HM
450 ► Idaho, Cassia County, Almo — Fading Away —
There are thousands of names here I registered on a large Rock. -- Richard Augustus Keen at City of Rocks, June 22, 1852 Throughout the West emigrants recorded their passing by writing their names -- often with axle grease -- at unique . . . — — Map (db m123960) HM
451 ► Idaho, Cassia County, Almo — Twin Sisters —
They rise in a cone-like form from the bottom of the valley to a height of from 400 to 600 feet they are round and quite regular in form, tapering gradually to a point. -- Emigrant journal entry (Sawyer) describing the Twin Sisters, circa . . . — — Map (db m123994) HM
452 ► Idaho, Cassia County, Oakley — 344 — City of Rocks —
A vast display of towering granite rocks (16 miles southeast of here) attracted emigrants who were on their way to California. A gold rush visitor, July 14, 1849, reported that "you can imagine among these massive piles, church domes, . . . — — Map (db m31637) HM
453 ► Idaho, Cassia County, Oakley — Granite Pass —
One day west of the City of Rocks: Never saw such dust! In some places it was actually to the top of the forewheels! Fine white dust; more like flour. Our men were a perfect fright, being literally covered. -- Emigrant journal entry, circa . . . — — Map (db m124025) HM
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454 ► Idaho, Clark County, Dubois — Fort Henry Historic Byway — Battle of Camas Meadows —
( six panels are located beneath the interpretive site shelter:) A Region Where History Was Made The scenic routes shown on this map will take you to several historic and scenic landmarks in northeastern Idaho. You will . . . — — Map (db m124526) HM
455 ► Idaho, Clearwater County, Weippe — Weippe Prairie —
This marker was dedicated 1957 to commemorate the arrival of the Lewis and Clark Expedition at Weippe Prairie, Idaho, Sept. 23, 1805. Also to honor the memory of Dr. J.T. Moser who pioneered here in the 1890's and to honor the memory of his . . . — — Map (db m121440) HM
456 ► Idaho, Clearwater County, Weippe — Weippe Prairie —
Welcome to Weippe Prairie This has always been a traditional gathering place for the Nez Perce people where camas bulbs are harvested and baked each year. The blue flower of the camas lily grow so thick here in the spring time that from . . . — — Map (db m121610) HM
457 ► Idaho, Custer County, Mackay — Earthquake! - The Event —
There are no records from explorers’ journals or pioneers’ memories of earthquakes occurring in this area. Scientists have not detected activity in recent time. But, old fault scars indicate that earthquakes occurred before. Geologists recognized . . . — — Map (db m109708) HM
458 ► Idaho, Custer County, Mackay — Earthquake! - The Results —
• The scarp before you extends for 21 miles, paralleling the mountain front. In some places, multiple scarps formed. • Ground motion, or “ground roll,” did $15,000,000 damage to roads and buildings in the Challis and Mackay areas. . . . — — Map (db m109709) HM
459 ► Idaho, Custer County, Mackay — Earthquake! - The Stage —
Idaho is part of the world’s longest mountain chain above sea level. This chain extends from the tip of South America to Alaska’s north coast. The widest section is in the western United States - from the Sierra Nevada to the Rocky Mountains. The . . . — — Map (db m109706) HM
460 ► Idaho, Custer County, Mackay — 356 — Earthquakes —
On October 28, 1983, a major earthquake fracture, 26 miles long and 7 miles deep, surfaced as Lost River Valley slid away from Mount Borah. During that rock shift, Mount Borah’s ridge front rose about 6 inches, while this valley . . . — — Map (db m109704) HM
461 ► Idaho, Custer County, Mackay — 229 — Goodin's River —
Known as Goddin's River in the days of the fur trade. This stream originally was named for the trapper who discovered it. Thyery Goddin, a prominent Iroquois who explored this river in 1819 or 1820, had come here with Donald Mackenzies fur . . . — — Map (db m109705) HM
462 ► Idaho, Custer County, Mackay — 45 — Mount Borah —
Idaho’s highest peak, 12,662 feet, is named for William E. Borah, who served in the United States Senate from 1907 until his death in 1940. Ten or a dozen large but shallow inland seas have covered this area in the past billion years. They . . . — — Map (db m109703) HM
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463 ► Idaho, Custer County, Stanley — The Boiling Fountain —
Alexander Ross and his Hudsons Bay Company fur trappers were the first white men to visit these hot springs. His dairy describes camping "at the boiling fountain" when they came here on October 1, 1824. Hot springs result when hot water reached . . . — — Map (db m110040) HM
464 ► Idaho, Elmore County, Mountain Home — 4 — Site 4 ★ Hot Springs — Main Oregon Trail Back County Byway —
Saturday August 16 "...we passed a hot springs near the foot of the same range, the water of which was nearly at a boiling temperature, so that one could not hold is finger in it, and a dog careless stepping across it put one foot in and ran . . . — — Map (db m125752) HM
465 ► Idaho, Franklin County, Preston — 432 — Old Delta Sediments —
Diverted into this valley by lava flows, the Bear River deposited a huge, mostly red clay delta here where it entered a vast inland sea that covered much of Utah. About 14,500 years ago , its shoreline suddenly went down about 80 feet . . . — — Map (db m105834) HM
466 ► Idaho, Franklin County, Weston — 553 — Pass of the Standing Rock —
The Pass of the Standing Rock was held sacred by the ancient ones of the Shoshone and other Native American Tribes long before John C. Fremont's exploratory party came to Weston Canyon on August 29, 1843. Fremont's surveyors spent the entire day . . . — — Map (db m140345) HM
467 ► Idaho, Fremont County, Ashton — Teton Mountain Range — Les Trois Teton or , The Three Breasts —
John Colter after serving with the Lewis and Clark Expedition journeyed to the Teton Yellowstone Country in 1807, and became the first mountain man to see the Teton Mountain Range. Early fur trappers gathered in the valley at the base of the Teton . . . — — Map (db m108571) HM
468 ► Idaho, Fremont County, Ashton — 267 — The Three Tetons —
The Three Tetons The giant peaks to the southeast were a famous early western landmark known to fur hunters and mountain men. Perhaps as early as 1819, French-speaking trappers were calling them the Trois Tetons - - the three breasts. More . . . — — Map (db m103907) HM
469 ► Idaho, Fremont County, Ashton — 396 — Volcanic Calderas —
Some 2,000,000 years ago, massive eruptions of hot rock boiled for 60 miles from this high rim on across Yellowstone Park. An exceptionally large crater remained when that lava surface collapsed. Another smaller caldera followed north . . . — — Map (db m103937)
470 ► Idaho, Gooding County, Bliss — Formation of Malad Gorge —
Thousands of years ago, immense flows of water from alpine glaciers and high levels of precipitation sent waters cascading over a broad area of the Snake River Canyon directly into the Snake River. Weak joints in the basalt walls gave way to these . . . — — Map (db m71547)
471 ► Idaho, Gooding County, Bliss — 300 — Fossil Beds —
Fossil bones of zebras, beaver, otter, pelicans and other water birds are found in sediments left from a 3,400,000 year old pond on the bluff across the river. Lava flows, pouring out over the plains on this side, met and dammed up sedimentary . . . — — Map (db m31598) HM
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472 ► Idaho, Gooding County, Bliss — The Malad Springs — One of the Largest in the Country —
Few places in Idaho or the United States show evidence of spring water more clearly than in Malad Gorge. These springs flow from the vast Snake River Aquifer through porous pillow basalts. On the opposite side of the canyon, where the river widens, . . . — — Map (db m71549)
473 ► Idaho, Gooding County, Bliss — Woody's Cove / The Hagerman Valley —
Woody's Cove This deep, basalt canyon was formed similar to Malad Gorge – by a retreating cataract, a huge waterfall. About four million years ago, local volcanoes spewed enormous amounts of lava over the area. Then, about one . . . — — Map (db m71593)
474 ► Idaho, Gooding County, Hagerman — A Changing Climate —
Idaho was a very different place during the Pliocene Epoch (three to four million years ago). Like much of the planet, this area was warmer and more humid, with annual rain fall of 20 inches. Studies of ancient pollen found in the sand and clay . . . — — Map (db m139552) HM
475 ► Idaho, Gooding County, Hagerman — Ancient Lakes —
Can you find traces of the three ancient lakes that helped form Hagerman Valley and preserved the fossils found here? The first, known as Lake Idaho, covered most of present-day southwestern Idaho about three to eight million years ago. Over time, . . . — — Map (db m139556) HM
476 ► Idaho, Gooding County, Hagerman — Sediments and Fossils —
The rock layers in the bluff across the river are made of sediments - particles of sand, silt, and clay. These layers, called strata, were carried here by the ancient Snake River and were deposited as the river entered an ancient lake. This process . . . — — Map (db m139554) HM
477 ► Idaho, Gooding County, Hagerman — Volcanoes Along the Snake — Lava Landscape —
The features before you testify to a fiery volcanic past. Distant hills, called buttes, are actually "shield" volcanoes. Named for their shape, these shield volcanoes formed when lava flowed from cracks, or vents, in the earth's crust. Over the past . . . — — Map (db m139611) HM
478 ► Idaho, Idaho County, Grangeville — The Camas Connection —
Before the continent was called America, before settlers came looking for land, the Nez Perce people lived and traveled throughout a vast area we now know as Idaho, Oregon, and Washington. They lived a semi-nomadic lifestyle, following the growing . . . — — Map (db m141249) HM
479 ► Idaho, Idaho County, Kooskia — The Lolo Trail — "I belong to the land from which I came." Toohoolhoolzote —
(This marker is composed of two panels and is presented here as if the panels were joined.) The land today looks much the same as it did to Lewis and Clark. Today, as stewards of this beautiful land, we have an opportunity to leave a . . . — — Map (db m123213) HM
480 ► Idaho, Idaho County, Riggins — From The Beginning — Riggins’ Geologic History, Flora and Fauna — Salmon River Heritage Waking Tour —
Before recorded history, the area we know as Riggins was on the west coast of the North American Continent. Thousands of miles to the west was the Pacific Plate, covered by ocean with only a few high points rising above the water. This plate was . . . — — Map (db m119411) HM
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481 ► Idaho, Idaho County, White Bird — 298 — Salmon River —
A vast mountain wilderness, cut by the mile deep Salmon River Canyon stretches across Idaho south and east of here. Travel through the Salmon River Mountains always was hard in the early days. An 1872 railroad survey showed the Salmon . . . — — Map (db m109667) HM
482 ► Idaho, Jerome County, Twin Falls — 326 — Emigrant Road —
More than a century ago, fur trappers and emigrants followed an old Indian trail that crossed here on its way to Oregon. Hudson's Bay Company traders preferred this route between Fort Hall and Fort Boise, but early emigrant wagons had to . . . — — Map (db m31500) HM
483 ► Idaho, Kootenai County, Coeur d'Alene — 170 — Coeur d'Alene Lake —
Look to the north: blocking the northward passage of the rivers which form this lake, a great dam of glacial ice once towered above the horizon as far as the eye can see. When the glacier melted, about 600,000 years ago, it left a moraine - a . . . — — Map (db m122872) HM
484 ► Idaho, Kootenai County, Harrison — 281 — Submerged Valley —
Glacial activity about 9000 to 12000 years ago created this lake out of what previously had been the valley of a river. The ice sheet occupied major valleys north of here. As the glacier receded, melt waters flooded across the outlet of this . . . — — Map (db m122125) HM
485 ► Idaho, Kootenai County, Hauser — 256 — Purcell Trench —
A long, glaciated valley, extending from British Columbia this far into Idaho, brought part of a continental ice sheet past here thousands of years ago. Rocks and boulders transported here by glacial ice backed up Lake Coeur d'Alene. . . . — — Map (db m122127) HM
486 ► Idaho, Lemhi County, Carmen — William Clark's "Pirimids" —
Clark's "Pirimids" are lessons in erosion and deposition. Looks closely at the columns to see layers of sediment: sandstone, gravel, and larger rocks that were eroded from ancient hills and deposited in valleys millions of years ago. Time and . . . — — Map (db m123683) HM
487 ► Idaho, Lemhi County, Tendoy — "Immence Ranges of High Mountains Still to the West of Us…" — - Meriwether Lewis, August 12, 1805 —
Filling in the Blanks The maps of North America carried by Lewis and Clark showed only a vast, uncharted space between the Mandan villages of the Missouri Rier and the Pacific Coast. The mountains separating the Missouri and Columbia river . . . — — Map (db m109507) HM
488 ► Idaho, Lemhi County, Tendoy — Agency Creek — Looking West to the Salmon River Country — Beaverhead-Deerlodge & Salmon-Chaillis National Forest —
First Taste of the Columbia "we proceeded on to the top of the dividing ridge from which I discovered immence ranges of high mountains still to the West of us with their tops partially covered with snow. I now decended the mountain about . . . — — Map (db m109543) HM
489 ► Idaho, Lemhi County, Tendoy — Crossing the Great Divide — Corps of Discovery —
High Point of the Journey "thus far I had accomplished one of those great objects on which my mind has been unalterably fixed for many years.," wrote Meriwether Lewis, 456 days after setting out from St. Louis. Lewis, George . . . — — Map (db m109504) HM
490 ► Idaho, Lemhi County, Tendoy — The Withington Caldera — Lewis and Clark in Lemhi County —
About 50 million years ago, this was one of the most violent landscapes on Earth. A sub-surface mass of molten rock rose and subsided in cycles, spewing gas, mineral fragments and ash in explosions hundreds of times more powerful that an atomic . . . — — Map (db m109446) HM
491 ► Idaho, Lewis County, Nezperce — 372 — Camas Prairie —
Most of Camas Prairie's wind blown soil rests upon Columbia River lava flows. Coming from a series of widespread eruptions, they covered older, eroded granite rocks here some 6 to 17 million years ago. Some earlier volcanic extrusions, . . . — — Map (db m140897) HM
492 ► Idaho, Madison County, Rexburg — 301 — Menan Buttes —
Menan Buttes Two cones of glassy lava are located directly south of here. The largest rises 800 feet above the surrounding plain. Hot molten lava, erupting from great depth, met cold surface water in the wet flood plain of Snake river: the . . . — — Map (db m103901) HM
493 ► Idaho, Nez Perce County, Lapwai — Ant & Yellowjacket — támsoy ka・?alatálo —
The basalt arch on the hillside across the road depicts támsoy ka・?alatálo, insects Ant and Yellowjacket, locked in combat. Many features in this river valley relate to nimi・pu・ (Nez Perce) traditional stories. . . . — — Map (db m121414) HM
494 ► Idaho, Nez Perce County, Spalding — Clearwater River — kú・s kayxkáyx —
For thousands of years the river scene at this village site hardly changed. The stream was full of fish, served as a trade route for neighboring tribes, and attracted wildlife to this green corridor. While the river fostered a life of bounty and . . . — — Map (db m121715) HM
495 ► Idaho, Oneida County, Holbrook — Twin Springs Historic Site — Curlew National Grassland —
Twin Springs is an oasis amid rolling hills of sagebrush; or as the early pioneers described "an endless sea of Artemisia". Wildlife, birds and people are drawn to Twin Springs' still water and rich grasses. Indigenous people traveled this valley . . . — — Map (db m124144) HM
496 ► Idaho, Oneida County, Keogh — 317 — Lake Bonneville —
20,000 years ago, this land was under water. Not far to the north, you can see the old shore of Lake Bonneville. Formed in a basin from which no river reached the ocean, this became the largest lake in North America. Finally the lake . . . — — Map (db m32888) HM
497 ► Idaho, Owyhee County, Marsing — 192 — Owyhee Country —
The name applied to these mountains and the whole surrounding region is an outdated spelling of the word "Hawaii". Fur-trading ships brought Hawaiian natives -- then called "Owyhees" -- to the Northwest. In 1818, Donald Mackenzie brought the . . . — — Map (db m110212) HM
498 ► Idaho, Payette County, Fruitland — 263 — Snake River —
The valley of the Snake, historic passage from the Midwest to the Northwest, has been a primary route for travel since the days of Indians and fur traders. The Oregon Trail forded the river at Old Fort Boise, the Hudson's Bay Company 12 . . . — — Map (db m23195) HM
499 ► Idaho, Power County, American Falls — Coldwater Hill Rest Area Oregon Trail Kiosk — The Oregon Trail —
(There are five historical panels in this kiosk:) Idaho's Emigrant Trail Westward-bound emigrants entered Idaho after crossing Thomas Fork Valley. They soon encountered the climb and descent of Big Hill, witnessed nature's . . . — — Map (db m124029) HM
500 ► Idaho, Power County, American Falls — Snake River Rest Area Oregon Trail Kiosk — The Oregon Trail —
(There are five historical panels in this kiosk:) Idaho's Emigrant Trails Westward-bound emigrants entered Idaho after crossing Thomas Fork Valley. They soon encountered the climb and descent of Big Hill, witnessed . . . — — Map (db m124037) HM

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Oct. 19, 2026