The scene before you is the result of a tectonic collision that went on for millions of years, beginning in the Jurassic period – about 200 million years ago – and ending here about 15 million years ago. During that time the Pacific seafloor . . . — — Map (db m210703) HM
Operation of the Fourth Street Bridge
The Peter R. Maloney Bridge, otherwise known as the Fourth Street Bridge, opened in 1917 after a two-year period of construction. Joseph B. Strauss, the leading designer of bascule bridges in the . . . — — Map (db m162761) HM
To reach the site of the south tower foundation, workers constructed a temporary roadway on a timber access trestle, or wharf, from the San Francisco shore. The dangers of the exposed location soon became apparent in 1933, when a freighter collided . . . — — Map (db m176570) HM
When asked how long the Golden Gate Bridge would last, Chief Engineer Joseph Strauss replied, "Forever." The Bridge was designed to be strong and durable, but to make it a lasting monument requires continual maintenance and improvements.
Since . . . — — Map (db m176575) HM
Bridge construction began in 1933, in the midst of the Great Depression. The unemployment rate was 25 percent, and jobs were much sought after. With the exception of highly specialized jobs, the Bridge was built by local labor. Besides the pay, the . . . — — Map (db m176574) HM
The Golden Gate Bridge is one of the world’s largest examples of the Art Deco style.
Named for the Exposition Internationale des Arts Décoratifs et Industriels Modernes, held in Paris in 1925, the Art Deco style was used by architect Irving . . . — — Map (db m176578) HM
Defending the Golden Gate
Battery Lancaster's mission was unique among the many artillery installations on this bluff. From 1900 through World War I, Lancaster's three guns offered the only artillery coverage from the south for the . . . — — Map (db m176564) HM
San Francisco grew rapidly in the early 1900s, but the mile-wide Golden Gate Strait limited access and development to the north. Traveling north to Marin County and the Redwood Empire beyond required a lengthy trip by ferryboat.
In 1923, popular . . . — — Map (db m176567) HM
In 1921, engineer Joseph B. Strauss submitted a design for a bridge that would cross the Golden Gate Strait — a hybrid bridge with a suspension span supported at each end by cantilever trusses. By 1929, consulting engineers Leon S. Moisseiff and . . . — — Map (db m176569) HM
Quick Facts on the Golden Gate Bridge
Period of construction: Just over four years. Construction commenced on January 5, 1933 and the Bridge was open to vehicular traffic on May 29, 1937.
Cost: $35 million dollars in the 1930’s, . . . — — Map (db m176583) HM
The curve of an arch experiences pushing forces, or compression.
At the south (San Francisco) end of the suspension bridge, a large steel arch carries the roadway deck over Fort Point, the brick fort below.
Fort Point was completed in . . . — — Map (db m176563) HM
The steel trusses on each side of the roadway deck structure along its length can be identified by their triangles. The trusses support beams holding up the roadway and stiffen the deck structure against wind. They span 50 feet (15 meters) between . . . — — Map (db m176573) HM
The Strauss Circle commemorates
the 75th anniversary of the Golden Gate Bridge
and honors the legacy of
Joseph B. Strauss, its first chief engineer. — — Map (db m195724) HM
Until 10,000 years ago, the sea level was over 300 ft (100 m) lower than today. An ancient river cut a canyon here, forming the Golden Gate Strait. When a warmer climate ended the Ice Age, the sea level rose and flooded the interior valley to form . . . — — Map (db m176566) HM
Joseph Strauss dreamed of a golden bridge spanning San Francisco Bay.
But people opposed it fearing it would never survive the strong tides, it would lower property values, it would ruin the view. More than 2,000 lawsuits were filed to stop . . . — — Map (db m195723) HM
Ever since the modern suspension bridge was invented in the early 1800s, one of the biggest challenges engineers have faced is preventing these flexible structures from moving too much in the wind.
A storm on December 1, 1951, caused the Golden . . . — — Map (db m131193) HM
By mid-1935, the north and south towers stood ready to support the two main cables. Each of the cables measured a little over 3 feet (1 meter) in diameter and weighed 12,000 tons. They were far too heavy to carry across the Golden Gate Strait on . . . — — Map (db m176572) HM
Only rarely must the Golden Gate Bridge withstand earthquakes or strong wind, but everyday it must fight another threat: corrosion of the steel which creates a byproduct called rust.
Steel is an alloy comprised principally of iron along with . . . — — Map (db m176579) HM
Tallest Bridge Towers
The Golden Gate Bridge not only set the record for longest bridge span when completed in 1937, it also had the tallest towers.
Honeycomb Legs — Strong, but Light
This innovation introduced by the Golden Gate . . . — — Map (db m176580) HM
The side view (elevation view) of the Golden Gate Bridge shown here in bronze is 1:2,000: the actual bridge is 2,000 times larger. The distance between the actual towers is 4,200 feet (1,280 m), which set the world record for the longest span when . . . — — Map (db m195726) HM
"The Golden Gate!" Army explorer John Charles Fremont named the entrance to San Francisco Bay in 1846. His Majesty Emperor Joshua Abraham Norton decreed in 1869 a bridge be built “…across the Golden Gate to Sausalito Ridge.” Work finally began 64 . . . — — Map (db m31685) HM
This tower has been named for Pacific Gas and Electric Company in appreciation of its gift of light to the Golden Gate Bridge. PG&E made the largest single private contribution toward the permanent lightning of the twin towers, installed for the . . . — — Map (db m243378) HM
Suspension bridges are the longest-spanning bridges in the world. Prior to the record set by the Golden Gate Bridge in 1937, 4,200 ft (1,280 m), the longest-spanning bridge in the world was the George Washington Bridge, with a span of 3,500 ft . . . — — Map (db m176582) HM
One of the greatest construction challenges took place underwater. The south tower was located more than 1,100 feet (335 meters) from the San Francisco shore. To build the south tower structures, divers played a critical role descending up to 110 . . . — — Map (db m176576) HM
A long-span suspension bridge usually has tall towers. The height of the Bridge's towers directs the tensile (pulling) forces in the main cables upward, so that the cables can efficiently hold up the roadway deck.
The 746-foot-tall . . . — — Map (db m176571) HM
Beginning in the 1860s, foundries South of Market Street fabricated mining machinery, railroad cars, and ships. This 1912 machine shop is the last. Fred V. Wilbert forged fine tools here. Edwin A. Klockars (1898-1994), a native of Munsmo, Finland, . . . — — Map (db m110905) HM
Emperor of the United States
and Protector of Mexico 1859-80,
whose prophetic wisdom
conceived and decreed the
bridging of San Francisco Bay
August 18 1869
Dedicated by E Clampus Vitus, Feb. 25, 1939 — — Map (db m241732) HM
Begun in 1933 in the depths of the Depression, the San Francisco-Oakland Bay Bridge put hundreds of men to work on two six-hour shifts, morning and night, for three years and seven months, to finish two months ahead of schedule on November 12, . . . — — Map (db m92904) HM
The Francis Lefty O'Doul Third Street Bridge,
City Landmark No. 194, was built in 1933.
The Strauss Engineering Company, designers
Of the Golden Gate Bridge, designed this heel
trunnion type steel truss bascule bridge. The
bridge is weighted at . . . — — Map (db m162763) HM
Tom Loughlin’s sculpture repurposes steel girders and a light salvaged from the original East Span of the Bay Bridge which was opened in 1936., damaged in the 1989 Loma Prieta earthquake, and taken out of service in 2013. Demolition of the original . . . — — Map (db m210549) HM
With a strategic location in the center of the San Francisco Bay opposite the Golden Gate, Yerba Buena Island has been home to three branches of the U.S. Military – the Army, Navy and Coast Guard.
From 1867 to 1897 the Army used the island . . . — — Map (db m218468) HM
County of San Joaquin
Mackville Road Bridge
Dedicated to the citizens of the Clements and Lockeford areas and San Joaquin County, January 1977
Board of Supervisors
George L. Baker • Norman D. Shumway • Adrian C. Fondse • Clifford . . . — — Map (db m151208) HM
In the 1800's the United States was experiencing its industrial revolution. Inventors were running rampant. The new horseless carriage was the rage. America soon realized that the horse and buggy were a thing of the past. Bicyclists, having trouble . . . — — Map (db m230997) HM
An officer for the Town of Hillsborough from April 1, 1956 until his untimely death on August 5, 1959, who made the supreme sacrifice at the hands of a criminal suspect whom he had apprehended. — — Map (db m18330) HM
After the 1906 earthquake and its resulting fires destroyed much of San Francisco, public support surged for a reliable water supply. This allowed San Francisco to look beyond the Bay Area to resolve the region’s growing need for reliable, . . . — — Map (db m202491) HM
In 1923, the cities of San Mateo, Burlingame, and Hillsborough began planning for a bridge to link the San Francisco Bay peninsula cities with East Bay and Central Valley communities. Even after the Dumbarton Bridge opened, in 1927, these . . . — — Map (db m28727) HM
History
The Cut Stone Bridge before you was constructed in 1863 for one of the earliest rail lines on the peninsula, the San Francisco & San Jose Railroad, which ran between the two cities of its name until it merged with the Central Pacific . . . — — Map (db m206367) HM
Built in 1892-93 and believed to be the tallest covered bridge in the country, it stood as the only entry to Felton for 45 years. In 1937 it was retired from active service to become a pedestrian bridge and figured prominently in many films of that . . . — — Map (db m2348) HM
Dedicated to the pioneer spirit of America
which bridges past, present and future
Designed in 1844 by Thomas Willis Pratt
Constructed 1969 by Roaring Camp & Big Trees
Narrow Guage RR. First Pratt-Truss covered bridge
built in . . . — — Map (db m190688) HM
You are looking at the Santa Cruz Municipal Wharf, a place where people gather for fun and relaxation. When this wharf was built in 1914, it supported commerce and transportation. Steamships loaded with freight and passengers left for ports around . . . — — Map (db m205960) HM
This aqueduct was built in 1918 as connecting link of main canal of Anderson Cottonwood Irrigation Dist., to carry water across Anderson Gulch to irrigate lands in southern Shasta Co. Aqueduct is 1249 ft. long, 8 ft. wide, 5 ft. deep and 20 ft. from . . . — — Map (db m70339) HM
It took a bit of grit and determination for the Forest Service and Civilian Conservation Corps (CCC) crew to build this sturdy bridge...
Raymond Huber, who supervised the project remembers... “I was given a pickup and a plan of a 160-foot . . . — — Map (db m69821) HM
Two separate markers have been mounted on the same rock.Marker on the Right:
Diestelhorst Auto Camp
Gotlieb Justus Diestelhorst came to Shasta in 1852, to grow produce and vegetables to sell. He found the soil . . . — — Map (db m70331) HM
To cross Clear Creek in 1865 it would have cost you 10 cents to walk across, 25 cents to ride over on horseback, and $1.25 to cross by wagon. Charles Camden, the bridge owner, spent $20,000 to improve the road between here and the town of Shasta. . . . — — Map (db m12565) HM
U S Forest Ranger
John F. Williams
Memorial Bridge
Gave his life to save
the life of a drowning
girl at this location
June 24, 1940 — — Map (db m70257) HM
President Franklin Delano Roosevelt established the Civilian Conservation Corps on March 31, 1933, to provide employment for America's youth and promote the nation's economic recovery. The CCC's work involved conservation projects on forest, park . . . — — Map (db m547) HM
The Arch is the strongest form of architecture known to Man.
This steel arch replaces the original concrete arch first erected on this site in 1922. Due to the lack of maintenance over the years, surface cracks appeared. Because there were no . . . — — Map (db m62809) HM
The bridges, oil refineries, factories and ports along the East Bay shoreline reflect a commercial history that dates back to the Gold Rush. The Carquinez Strait provided easy passage for ships carrying cargo and people to and from the gold . . . — — Map (db m232404) HM
Valley of the Moon is a translation of Sonoma Valley's name given by the Pomo and Coast Miwok peoples, the area's original inhabitants.
Many writers and artists have found creativity here. Mary Francis Kennedy (MFK Fisher), excited by the . . . — — Map (db m231586) HM
Picturesque mining center and trading post, 1849, once called Dentville. Early ferry to the southern mines; county seat 1862-72; rare wooden covered bridge reputedly designed by U. S. Grant, brother-in-law of the Dent brothers, 1854; old flour mill, . . . — — Map (db m178066) HM
Knight's Ferry Bridge
has been designated a
National Historic Landmark
This property possesses national significance
in commemorating the history of the
United States of America Knight’s Ferry Bridge is an exceptionally fine . . . — — Map (db m146387) HM
Founded 1849 by Judge O D Dickerson.
Named for Jesse Hill
Operator of the Ferry Boat that landed just upstream under the present bridge site. — — Map (db m58204) HM
This turnstyle bridge served the California & Oregon Railroad Co. It was surveyed in September 1870 and was completed in August 1871. The bridge was first crossed by the steam locomotive "Falcon" and by the "Clipper" the following day with one . . . — — Map (db m89184) HM
The Union Hill Mines, which began in 1862, were located up the western slope of Union Hill from the mouth of Weaver Creek, at the head of Union Gulch. It was one of the largest placer mines in Trinity County. Water was ditched from Weaver Creek and . . . — — Map (db m70306) HM
Beneath this bridge lies the site of the historic Gold Rush mining camp of Stevens Bar (or Stephens Bar) founded in 1849.
The first bridge to span the upper Tuolumne River was constructed just above this point in 1857. Following its destruction . . . — — Map (db m53342) HM
Built in 1917-18, this entrance to Davis is among the oldest surviving examples of I-beam construction on a railroad grade separation. The underpass was part of the Lincoln Highway. The bicycle bore was added in 1978. Listed in the National Register . . . — — Map (db m57189) HM
Dedicated April 23, 2000
WEST SACRAMENTO
by
James Stretesky
First Northern Bank
Daniel F. Ramos Family
Frank C. Ramos Family
Dr. & Mrs. James O. Farley
West Sacramento Land Company
West Sacramento Chamber of Commerce
Pony Express Trail . . . — — Map (db m15708) HM
Sacramento’s graceful Tower Bridge has spanned the river since 1936. It is the only historically significant vertical-lift bridge in California and was placed on the National Register of Historic Places in 1982. Lights added in 1986 in honor of its . . . — — Map (db m15711) HM
Identifying A Need
By the early 1930s, Americans were moving away from trains and ships and turning to automobiles as their main mode of transportation. As a result, traffic on roadways increased dramatically. In Sacramento, M Street (now . . . — — Map (db m229443) HM
In 1859 the rich Comstock Silver Lode was discovered in Washoe Territory, Nevada, causing many miners to quickly pack up and head east. Immediately a company was formed to construct a road connecting this area of California to the Comstock finds. . . . — — Map (db m65968) HM
Built in 1860, the Oregon Creek Covered Bridge was floated from its foundations by the flood waters from the breaking of English Dam in 1883. It was restored to place by using ox teams and log rollers, but turned end for end in the process. — — Map (db m65967) HM
This bridge symbolizes the revitalization of lower downtown Denver in the late twentieth century and represents one of the many contributions made to our community by Emanuel "Manny" Salzman. After moving to LoDo in 1980, Manny and his wife, Joanne, . . . — — Map (db m97412) HM
During the late 18th century and early 19th century, Cañon City prospered as a trade and transportation center serving the agriculture and mining industries of the region. From its earliest days, Cañon City attracted visitors to soak in warm . . . — — Map (db m153316) HM
A Fitting Name
This amazing chasm was originally known as the "Grand Cañon of the Arkansas," which was sometimes confused with the "Grand Canyon of the Colorado." In the summer of 1874, Charles Savage, a famous railroad photographer from . . . — — Map (db m232533) HM
Lt. Zubulon M. Pike and his men, who traveled through this area in November and December 1806, were the first American explorers to view the Arkansas River Canyon now known as the Royal Gorge. A small party from the Maj. Stephen H. Long expedition . . . — — Map (db m34858) HM
Highest suspension bridge in the world
Completed in seven months - Dedicated Dec. 7, 1929
Chief Engineer George Cole
Consulting Engineer O.K. Peck
This property has been placed on
National Register of Historic Places
By
U.S. . . . — — Map (db m39304) HM
Paving the Way
The Rio Grande Railroad Viaduct helped bring the world to the Royal Gorge.
"The opening of the new bridge is hailed with joy by Florence," wrote the Florence Daily Record on July 14, 1931, as the first autos . . . — — Map (db m232499) HM
Clockwise, from top
• The Pioneer Museum in Florence highlights the town's industrial past. Ample coal and water made the town an optimal site fer processing ore shipped via the Florence and Cripple Creek . . . — — Map (db m153002) HM
Royal Gorge Railroad War
Racing to lay the first tracks into the Colorado Rockies in April 1878, the Denver & Rio Grande and its rival, the Atchison, Topeka & Santa Fe, reached the Royal Gorge in a dead heat. Competing construction crews . . . — — Map (db m152999) HM
Four bridges once stood southwest of the original town site of Sapinero. Cars and trucks used the high bridge to travel between Gunnison and Montrose. Anglers used the low bridge to access the river.
The Denver & Rio Grande Railroad needed two . . . — — Map (db m158933) HM
(left side)
Bridging Our History
This bridge is the second Billy Drew Bridge erected on this site. The original Billy Drew Bridge was built in 1976 as part of Golden’s celebration of the Centennial-Bicentennial, the nation’s 200th . . . — — Map (db m70396) HM
Colorado Transcript, September 13, 1882: “Washington Avenue Bridge was badly damaged last Saturday evening by some ignoramus driving and crowding a big drove of cattle on to it. The damage has since been repaired.”
Golden . . . — — Map (db m49897) HM
John M. Ferrell came to the Golden valley from upstate New York in June of 1859. He camped on the southeastern banks of Clear Creek and created the Washington Avenue crossing for the gold rushers. When Golden was organized, Ferrell became one of its . . . — — Map (db m49895) HM
In June, 1859, while the first bridge was being built over Clear Creek, the famous reporter Horace Greeley passed through Golden. He attempted to cross Clear Creek from this point on the south bank. Horace embarked on his mule from the river bank . . . — — Map (db m49898) HM
Before the first bridge on this site was completed, travelers forded the river just east of this bridge. It became risky during the peak of the spring river flows due to the melting snows that filled the streams and rivers.
In June of 1859, . . . — — Map (db m50179) HM
Captain Charles H. Baker, who discovered gold in the San Juan in 1860, led a party of prospectors to this area in 1861. They placer mined on El Rio de las Animas, built the first bridge (300 feet north), and established the town called Animas . . . — — Map (db m177471) HM
The Florida River Railroad Bridge No. 437 (distance in miles from Denver, Colorado), provided an important river crossing in the Denver and Rio Grande's (D&RG) route to Denver. The Union Bridge Company fabricated the Pratt through-truss bridge in . . . — — Map (db m177463) HM
Promoters called this the "Scenic Line of the World" to entice travelers to see western Colorado by rail. The Denver & Rio Grande guidebook Around the Circle invited readers to join the trip: "Unlike many of the Colorado canyons, . . . — — Map (db m158937) HM
Fir logs, up to 30 feet in length, formed the base for the diversion dam. Although built in the winter when the river was sluggish, pumps were needed to divert the flow around the construction site. The dam is used to fill the tunnel when the water . . . — — Map (db m120247) HM
Surveyors took daily measurements to ensure that drillers, powdermen, muckers, and haulers stayed on course inching their way toward the valley. Crews at the other end plowed toward the canyon. Using points across the river, as well as in the . . . — — Map (db m120245) HM
The Tunnel That Made the Desert Bloom
Early settlers in the Uncompahgre Valley found getting water to the fertile but arid soil an ongoing challenge. Originally, irrigation water from the Uncompahgre River was diverted onto the land through . . . — — Map (db m120134) HM
Spanning the South Platte River, the Rainbow Arch Bridge carried vehicular traffic from its completion in 1923 until its closure in 1988. Engineer James B. Marsh of Des Moines, Iowa, designed the structure in 1922. Denver bridge contractor Charles . . . — — Map (db m47194) HM
Built in 1928, the Greehorn Bridge carried Pueblo County Road 273/Apache City Road over Greeenhorn Creek and was a rare example of a Warren deck truss structure. Because of its association with the early route known as the Great North - South . . . — — Map (db m189636) HM
French General Jean Baptiste Donatien de Vimeur, comte de Rochambeau, and thousands of French ground and naval forces arrived in Newport in July of 1780 to assist the Americans in the War for Independence. After wintering in Newport, Rochambeau’s . . . — — Map (db m26915) HM
Commodore Isaac Hull
Bridge
Named for the Heroic Commander
Of the U.S. Frigate “Constitution”
During Its Great Naval Victories
In the War of 1812
Born in Derby March 9, 1773
Resided in Shelton 1785 – 1794
This . . . — — Map (db m25381) HM
The Post Road Bridge
1807 Westport was a prosperous shipping community with wharves, docks, and shipyards along both sides of the Saugatuck River. The first Post Road Bridge was owned and built by the Connecticut Turnpike Company, a public . . . — — Map (db m30644) HM
The Farmington Canal crossed various topographic features- rivers, hills, roads and woodlands. Boats traveling the length of the canal passed through 28 locks that compensated for changes in elevation. Perhaps the most impressive engineering . . . — — Map (db m111590) HM
A toll bridge was built here
in 1734 by order of
the General Assembly
it was the first
highway bridge across
the Farmington River — — Map (db m102001) HM
By the 1890’s New Milford’s old wooden bridges had outlived their usefulness, considering their age, the increasing amount of traffic and the coming of the horseless carriage. A sturdy and very ornate iron bridge, built by the Berlin Iron Bridge . . . — — Map (db m22740) HM
The Work of the Salt Marsh
You are standing at the edge of an ancient marsh, above layers of peat forty feet deep. Once an inland freshwater lake, the Hammock estuary is now flooded twice daily by nutrient-rich salt tides.
Tidal salt . . . — — Map (db m243105) HM
Comstock Covered Bridge
Built in 1873 by the Towns of Colchester and East Hampton
The Comstock Covered Bridge is one of only three historic covered bridges remaining in Connecticut. With a main span 80 feet in length (measured from the faces of . . . — — Map (db m84109) HM
Length 78 feet – width 16 feet
Listed on the Register of
Historic Places
by the U.S. Department of
the Interior,
National Park Service
Erected in 1891
by
the Berlin Iron Bridge Company
Red Bridge is of lenticular pony truss . . . — — Map (db m26587) HM
Site of
King’s Bridge - 1711
connecting
Peacocke Lane (Maple Street)
to Governor’s Lane (Avenue)
Freelove Baldwin Stow Chapter
D.A.R.
July 4, 1962 — — Map (db m26331) HM
[ east side of the column ]
This Bridge Dedicated
On the 300th Anniversary
Of the Settlement Of
The Town of Milford
A Memorial to Three
Milford Men Who Were
Governors of the Colony
and
State Of Connecticut
[ north side . . . — — Map (db m26445) HM
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