1 ► Idaho, Ada County, Meridian — 193 — Initial Point —

On Main Street at Franklin Road, on the right when traveling north on Main Street.

2 ► Idaho, Bannock County, Downey — 171 — Red Rock Pass —

On U.S. 91 at milepost 30.2 near South Old Oxford Highway, on the right when traveling north.

3 ► Idaho, Bannock County, Lava Hot Springs — 13 — Lava Hot Springs —

Near Main Street near U.S. 30, on the right when traveling west.

4 ► Idaho, Bannock County, Lava Hot Springs — Lava Hot Springs' healing waters —

On Main Street near U.S. 30, on the right when traveling west.

5 ► Idaho, Bingham County, Blackfoot — 436 — Big Butte —

On U.S. 20 at Twin Buttes Road, on the right when traveling east on U.S. 20.

6 ► Idaho, Bingham County, Blackfoot — 287 — Lava Formations —

On Interstate 15 at milepost 101.3, on the right when traveling north.

7 ► Idaho, Bingham County, Blackfoot — 428 — Three Buttes —

On U.S. 20 at Twin Buttes Road, on the right when traveling east on U.S. 20.

8 ► Idaho, Blaine County, Bellevue — Timmerman Junction Oregon Trail Kiosk —

Near U.S. 20 at State Highway 75, on the left when traveling west.

9 ► Idaho, Blaine County, Ketchum — 292 — Salmon River —

On State Highway 75 at milepost 161 near Salmon River Road (Forest Road 215), on the right when traveling south.

10 ► Idaho, Boundary County, Bonners Ferry — 321 — Glacial Lakes —

On U.S. 95 at milepost 504 near Deep Creek Loop (State Highway 2), on the left when traveling north.

11 ► Idaho, Boundary County, Bonners Ferry — Moyie River Canyon —

On U.S. 2, 0.4 miles south of Old US Highway 2, on the right when traveling south.

12 ► Idaho, Butte County, Arco — A Plain of Volcanoes —

Near U.S. 20 at milepost 265,, 1.2 miles west of Van Buren Boulevard, on the right when traveling east.

13 ► Idaho, Butte County, Arco — Are We Loving Them to Death? —

Near U.S. 23/96.

14 ► Idaho, Butte County, Arco — Big Cinder Butte —

On U.S. 26/93 near North Laidlaw Park Road, on the right when traveling east.

15 ► Idaho, Butte County, Arco — Boy Scout Cave — Craters of the Moon National Monument and Preserve —

Near U.S. 20.

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16 ► Idaho, Butte County, Arco — Goodale's Cutoff —

On U.S. 26/93 near North Laidlaw Park Road, on the right when traveling east.

17 ► Idaho, Butte County, Arco — Indian Tunnel — Craters of the Moon National Monument and Preserve —

Near U.S. 20.

18 ► Idaho, Butte County, Arco — Just Down the Road — Craters of the Moon National Monument —

On U.S. 20, 1.5 miles west of Craters Loop Road, on the right when traveling east.

19 ► Idaho, Butte County, Arco — Silent Cone —

On U.S. 26/93 near North Laidlaw Park Road.

20 ► Idaho, Butte County, Arco — Vanishing Landmark —

On U.S. 20.

21 ► Idaho, Butte County, Arco — Volcanoes Along the Rift —

On U.S. 26/93 near Loop Road, on the right when traveling east.

22 ► Idaho, Butte County, Arco — Where's the Volcano? —

On U.S. 20 west of Craters Loop Road, on the right when traveling east.

23 ► Idaho, Butte County, Howe — 227 — John Day’s River —

On State Highway 33 at N 1480W (County Highway 1480), on the right when traveling west on State Highway 33.

24 ► Idaho, Caribou County, Grace — Black Canyon Gorge —

On Turner Road at River Road, on the left when traveling west on Turner Road.

25 ► Idaho, Caribou County, Grace — Lava Flows and Wagon Trains —

On State Highway 34 near U.S. 30, on the right when traveling south.

26 ► Idaho, Caribou County, Soda Springs — "It Roars Like a Mad Dragon" — S.E. Matthews, Soda Springs Geyer Corporation, December 1937 —

Near East 1st Street South near South Main Street.

27 ► Idaho, Caribou County, Soda Springs — 220 — Bear River Lava —

On Soda Point Power Plant Road near Reservoir Road, on the right when traveling south.

28 ► Idaho, Caribou County, Soda Springs — China Hat Geological Site —

On State Highway 34 near Blackfoot River Road, on the right when traveling west.

29 ► Idaho, Caribou County, Soda Springs — Coach History —

On East 2nd Street South (U.S. 30) near South Main Street, on the right when traveling west.

30 ► Idaho, Caribou County, Soda Springs — Guiding Landmark... — Sheep Rock —

On Soda Point Power Plant Road near Reservoir Road, on the right when traveling south.

31 ► Idaho, Caribou County, Soda Springs — 385 — Hooper Spring —

On East 2nd Street South near South Main Street, on the right when traveling west.

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32 ► Idaho, Caribou County, Soda Springs — Sheep Rock Geology —

On Soda Point Power Plant Road near Reservoir Road, on the right when traveling south.

33 ► Idaho, Caribou County, Soda Springs — 158 — Soda Springs —

On U.S. 30 near South 3rd Street West, on the left when traveling west.

34 ► Idaho, Caribou County, Soda Springs — Travertine Terraces - World Famous Water —

Near South Main Street.

35 ► Idaho, Caribou County, Wayan — 433 — Cariboo Mountain —

On Wayan Loop Road (State Highway 34) near Wayan Loop Road, on the right when traveling east.

36 ► Idaho, Cassia County, Almo — Distant Views —

On Circle Creek Overlook Road near City of Rocks Road (Highway 3075 S), on the left when traveling west.

37 ► Idaho, Cassia County, Almo — Twin Sisters —

On Twin Sister Road (Road 3400 S) near Birch Creek Road, on the left when traveling south.

38 ► Idaho, Cassia County, Oakley — 344 — City of Rocks —

On State Highway 27 at milepost 1,, 0.2 miles north of 1800 South Road, on the right when traveling south.

39 ► Idaho, Cassia County, Oakley — Granite Pass —

On Twin Sister Road (Road 3400 S) near Birch Creek Road (Junction Valley Road), on the right when traveling west.

40 ► Idaho, Clark County, Dubois — Fort Henry Historic Byway — Battle of Camas Meadows —

On A-2 Clark County Road (Main Street) near Old Highway 22, on the right when traveling east.

41 ► Idaho, Clearwater County, Weippe — Weippe Prairie —

On West Pierce Street (State Highway 11 at milepost 17) near West 7th Street, on the right when traveling east.

42 ► Idaho, Clearwater County, Weippe — Weippe Prairie —

On Larson Road near Cemetery Road, on the right when traveling east.

43 ► Idaho, Custer County, Mackay — Earthquake! - The Event —

Near Doublespring Pass Road (Forest Road 116) near Forest Road 679, on the left when traveling east.

44 ► Idaho, Custer County, Mackay — Earthquake! - The Results —

Near Doublespring Pass Road (Forest Road 116) near Forest Road 679, on the left when traveling east.

45 ► Idaho, Custer County, Mackay — Earthquake! - The Stage —

Near Doublespring Pass Road (Forest Road 116) near Forest Road 679, on the left when traveling east.

46 ► Idaho, Custer County, Mackay — 356 — Earthquakes —

On U.S. 93 at Doublespring Pass Road, on the right when traveling north on U.S. 93.

47 ► Idaho, Custer County, Mackay — 229 — Goodin's River —

On U.S. 93 at Fish Hatchery Road, on the left when traveling north on U.S. 93.

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48 ► Idaho, Custer County, Mackay — 45 — Mount Borah —

On U.S. 93 at Doublespring Pass Road, on the right when traveling north on U.S. 93.

49 ► Idaho, Custer County, Stanley — The Boiling Fountain —

Near State Highway 75 near Yankee Fork Road, on the left when traveling west.

50 ► Idaho, Elmore County, Mountain Home — 4 — Site 4 ★ Hot Springs — Main Oregon Trail Back County Byway —

On Northeast Teapot Road near Worth Lee Road, on the right when traveling west.

51 ► Idaho, Franklin County, Preston — 432 — Old Delta Sediments —

On U.S. 36 at milepost 12.9 at North Sage Ridge Road, on the right when traveling north on U.S. 36.

52 ► Idaho, Franklin County, Weston — 553 — Pass of the Standing Rock —

On Weston Canyon Road (State Highway 36) near West 300 South, on the left when traveling west.

53 ► Idaho, Fremont County, Ashton — Teton Mountain Range — Les Trois Teton or , The Three Breasts —

On Mesa Falls Scenic Byway (State Highway 47) near Forest Road 386, on the right when traveling north.

54 ► Idaho, Fremont County, Ashton — 396 — Volcanic Calderas —

On U.S. 20, 0.1 miles north of Anderson Mill Canyon Road, on the right when traveling north.

55 ► Idaho, Gooding County, Bliss — Formation of Malad Gorge —

Near Ritchie Road, 0.4 miles north of County Road E2350S.

56 ► Idaho, Gooding County, Bliss — 300 — Fossil Beds —

On U.S. 30 at milepost 176,, 1.8 miles south of E 2000 S, on the left when traveling north.

57 ► Idaho, Gooding County, Bliss — The Malad Springs — One of the Largest in the Country —

Near Ritchie Road, 0.4 miles north of County Road E2350S.

58 ► Idaho, Gooding County, Bliss — Woody's Cove / The Hagerman Valley —

Near Ritchie Road, 0.4 miles north of County Road E2350S.

59 ► Idaho, Gooding County, Hagerman — A Changing Climate —

Near Bell Rapids Road near Upper Salmon Falls Road, on the right when traveling west.

60 ► Idaho, Gooding County, Hagerman — Ancient Lakes —

Near Bell Rapids Road near Upper Salmon Falls Road, on the right when traveling west.

61 ► Idaho, Gooding County, Hagerman — Sediments and Fossils —

Near Bell Rapids Road near Upper Salmon Falls Road, on the right when traveling west.

62 ► Idaho, Gooding County, Hagerman — Volcanoes Along the Snake — Lava Landscape —

Near Bell Rapids Road near Upper Salmon Falls Road, on the left when traveling west.

63 ► Idaho, Idaho County, Grangeville — The Camas Connection —

On Pine Street near U.S. 95, on the right when traveling south.

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64 ► Idaho, Idaho County, Kooskia — The Lolo Trail — "I belong to the land from which I came." Toohoolhoolzote —

Near U.S. 12 at milepost 121, on the right when traveling west.

65 ► Idaho, Idaho County, Riggins — From The Beginning — Riggins’ Geologic History, Flora and Fauna — Salmon River Heritage Waking Tour —

Near North Main Street (U.S. 95) near North Dixon Street, on the right when traveling north.

66 ► Idaho, Idaho County, White Bird — 298 — Salmon River —

On U.S. 95 at Old White Bird Hill Road, on the right when traveling north on U.S. 95.

67 ► Idaho, Jerome County, Twin Falls — 326 — Emigrant Road —

On U.S. 93 at milepost 51,, 0.8 miles north of Golf Course Road, on the right when traveling north.

68 ► Idaho, Kootenai County, Coeur d'Alene — 170 — Coeur d'Alene Lake —

On State Highway 97 at milepost 96 near East Wolf Lodge Bay Road, on the left when traveling north.

69 ► Idaho, Kootenai County, Harrison — 281 — Submerged Valley —

On Harrison Road (State Highway 97 at milepost 67) near East O'Gara Road, on the left when traveling north.

70 ► Idaho, Kootenai County, Hauser — 256 — Purcell Trench —

On State Highway 53 near North Beck Road, on the left when traveling west.

71 ► Idaho, Lemhi County, Carmen — William Clark's "Pirimids" —

On Tower Rock Road near Redtail Lane, on the left when traveling east.

72 ► Idaho, Lemhi County, Tendoy — "Immence Ranges of High Mountains Still to the West of Us..." — - Meriwether Lewis, August 12, 1805 —

Near Forest Road 158 at Warm Springs Road (Forest Road 185) when traveling south.

73 ► Idaho, Lemhi County, Tendoy — Agency Creek — Looking West to the Salmon River Country —

On Warm Springs Road (Forest Road 158) near Lewis and Clark Highway (Forest Road 013), on the right when traveling south.

74 ► Idaho, Lemhi County, Tendoy — Crossing the Great Divide — Corps of Discovery —

Near Lemhi Pass Road near Lewis and Clark Highway (Forest Road 013), on the right when traveling south.

75 ► Idaho, Lemhi County, Tendoy — The Withington Caldera — Lewis and Clark in Lemhi County —

On Warm Springs Road (Forest Road 185) near Back Road (County Road 28), on the left when traveling east.

76 ► Idaho, Lewis County, Nezperce — 372 — Camas Prairie —

On State Highway 162 near Yellow Bird Road, on the right when traveling west.

77 ► Idaho, Madison County, Rexburg — 301 — Menan Buttes —

On State Highway 33, 1.5 miles east of Butte Road, on the right when traveling east.

78 ► Idaho, Madison County, Rexburg — 267 — The Three Tetons —

On State Highway 33 at Plano Road, on the right when traveling east on State Highway 33.

79 ► Idaho, Nez Perce County, Lapwai — Ant & Yellowjacket — támsoy ka・?alatálo —

On U.S. 12 at milepost 11 near U.S. 95, on the left when traveling east.

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80 ► Idaho, Nez Perce County, Lapwai — Clearwater River — kú・s kayxkáyx —

Near Watson's Store Road near 403 Road, on the left when traveling east.

81 ► Idaho, Oneida County, Holbrook — Twin Springs Historic Site — Curlew National Grassland —

On Blanch Spring Road near Old Highway 37.

82 ► Idaho, Oneida County, Keogh — 317 — Lake Bonneville —

On Interstate 84 at milepost 269, on the right when traveling north.

83 ► Idaho, Owyhee County, Marsing — 192 — Owyhee Country —

On I.O.N. Highway No. 456 (U.S. 95 at milepost 14) near Summer Camp Road, on the left when traveling south.

84 ► Idaho, Payette County, Fruitland — 263 — Snake River —

On Interstate 84 at milepost 1,, 1.9 miles north of U.S. 95, on the right when traveling east.

85 ► Idaho, Power County, American Falls — Coldwater Hill Rest Area Oregon Trail Kiosk — The Oregon Trail —

On Interstate 86 at milepost 18 near Cold Water Road, on the right when traveling east.

86 ► Idaho, Power County, American Falls — Snake River Rest Area Oregon Trail Kiosk — The Oregon Trail —

Near U.S. 86 at milepost 30 near Rock Creek Road, on the right when traveling west.

87 ► Idaho, Teton County, Tetonia — 315 — Teton Range —

On State Highway 33 at milepost 136.5 at Trouts Ranch Road, on the left when traveling north on State Highway 33.

88 ► Idaho, Twin Falls County, Hagerman — 330 — Fishing Falls —

On U.S. 30 at milepost 190,, 0.6 miles north of N 1000 E, on the right when traveling north.

89 ► Idaho, Twin Falls County, Hagerman — 204 — Salmon Falls —

On U.S. 30 at milepost 187,, 0.1 miles Chisholm Drive, on the left when traveling north.

90 ► Idaho, Twin Falls County, Hagerman — 166 — Thousand Springs —

On U.S. 30 at milepost 187,, 0.1 miles south of Chisholm Drive, on the left when traveling north.

91 ► Idaho, Twin Falls County, Hansen — Ancient Lake Bonneville — "Southern Idaho's Largest Flood in World History" —

Near State Highway 50, 0.3 miles north of County Road E3900N, on the left when traveling north.

92 ► Idaho, Twin Falls County, Kimberly — History Through the Eyes of a Camera —

On Twin Falls Grade near 4050 North Road, on the right when traveling north.

93 ► Idaho, Twin Falls County, Murtaugh — 284 — Caldron Linn —

On U.S. 30 at milepost 234,, 0.2 miles west of E 3500 N, on the right when traveling east.

94 ► Idaho, Twin Falls County, Twin Falls — Shoshone Falls —

On Champlin Road near North 3339 East.

95 ► Idaho, Twin Falls County, Twin Falls — 172 — Shoshone Falls —

On U.S. 93 at milepost 50,, 0.1 miles Bridgeview Road, on the right when traveling south.

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