Lewis and Clark County is a county located in the U.S. state of Montana. As of the 2020 United States Census, the population was 70,973. Its county seat is Helena, the state capital. The numerical designation for Lewis and Clark County is 5. The county was established on June 2, 1865 as one of the nine original counties of the Territory of Montana named Edgerton County in honor of Sidney Edgerton, first Governor of the Territory of Montana, and was renamed Lewis and Clark County on March 1, 1868 in honor of explorers Meriwether Lewis and William Clark.
A truss bridge is a bridge whose load-bearing superstructure is composed of a truss, a structure of connected elements, usually forming triangular units. The connected elements may be stressed from tension, compression, or sometimes both in response to dynamic loads. The basic types of truss bridges shown in this article have simple designs which could be easily analyzed by 19th and early 20th-century engineers. A truss bridge is economical to construct because it uses materials efficiently.
The Laughery Creek Bridge is a triple whipple truss bridge on the border of Dearborn County, Indiana, and Ohio County, Indiana. It crosses Laughery Creek. This bridge was built in 1878. The Wrought Iron Bridge Company, a prolific late 19th-century bridge company, constructed the bridge. The bridge is seated on stone abutments. The deck surface is not original and is currently concrete. The bridge, nearly 300 feet in length, is a single span pin connected triple intersection Whipple through truss, and is the only example in the world of this truss type. The name bridge's nickname, "Triple Whipple Bridge" is a play on words. The double-intersection Pratt, which was called the Whipple truss configuration, was a far more common variation of the standard Pratt configuration. Since the Laughery Creek Bridge's members have three intersections instead of two, this gives rise to the "Triple Whipple" name. This bridge was listed on the National Register of Historic Places in 1976.
The Milton–Madison Bridge is a continuous truss bridge that connects Milton, Kentucky and Madison, Indiana. It carries approximately 10,000 cars a day. The old structure was replaced with a completely new continuous truss which was constructed on temporary piers adjacent to the operational span between 2011 and 2012 and slid into place after demolition of the old span using a construction method called "truss sliding." The new crossing opened to vehicle traffic in April 2014, and a pedestrian sidewalk opened that October.
The King Iron Bridge & Manufacturing Company was a late-19th-century bridge building company located in Cleveland, Ohio. It was founded by Zenas King (1818–1892) in 1858 and subsequently managed by his sons, James A. King and Harry W. King and then his grandson, Norman C. King, until the mid-1920s. Many of the bridges built by the company were used during America's expansion west in the late 19th century and early 20th century, and some of these bridges are still standing today.
The Yale Bridge or Lewis River Bridge spans the Lewis River near Yale, Washington. It was built in 1932 by Cowlitz and Clark counties. The suspension bridge has a clear span of 300 feet (91 m), with a total length of 532 feet (162 m), replacing a previous steel truss bridge at the site. Construction of the Ariel Dam had created Lake Merwin with a water depth of 90 feet (27 m) at the site, requiring a new bridge that did not need to have support piers in the water. The road deck, stiffened by a steel Warren truss, is 50 feet (15 m) above the high water line of the reservoir.
The Lake Shore Drive Bridge, also known as the M-26 Bridge or the Eagle River Bridge, is a pedestrian bridge in Eagle River, Michigan, crossing the Eagle River. It carried highway M-26 over the river from 1915 until 1990, when the adjacent Eagle River Timber Bridge replaced it for automobile traffic. The Lake Shore Drive Bridge is listed as a Michigan State Historic Site and is a contributing property of the Eagle River Historic District.
The Yellowstone River Bridge is a site on the National Register of Historic Places located in Fallon, Montana. It was added to the Register on January 4, 2010. The Yellowstone River Bridge near the community of Fallon is a 2-span riveted continuous steel Warren through truss. Built between 1943 and 1944, the bridge was one of only a very few major bridge projects undertaken by the Montana Highway Department during World War II.
The Cameron Suspension Bridge crosses the Little Colorado River at Cameron, Arizona, United States.
The AJX Bridge is a historic Pratt truss bridge in southwestern Johnson County, Wyoming. The bridge was built in 1931 across the South Fork of the Powder River near Kaycee, Wyoming. AJX Bridge was built to provide a river crossing for U.S. Route 87. It was placed on the National Register of Historic Places in 1985 as part of a Multiple Property Submission devoted to historic bridges in Wyoming.
Hardy Bridge is a Warren through truss, three-span, two-lane bridge in the western United States. It crosses the Missouri River and is located at milepost 6 on Old U.S. Route 91, about fourteen miles (23 km) southwest of Cascade, Montana, which is southwest of Great Falls.
Natural Pier Bridge is a steel Warren through truss bridge spanning the Clark Fork river located 1 mile (1.6 km) west of Alberton, Montana, United States, which incorporates a natural rock outcrop as anchorage for a pier. It was nominated to the National Register of Historic Places as part of a related group of historic Montana bridges known as Montana's Historic Steel Truss Bridges and achieved listing on January 4, 2010. Built in 1917 by the Lord Construction Company of Missoula, Montana, it is one of only a few remaining bridges of its type in the state, and of those it is the only one that incorporates a natural feature in its design.
Sadliers Crossing Railway Bridge is a heritage-listed railway bridge at over Bremer River between Tallon Street, Sadliers Crossing and Dixon Street, Wulkuraka, Queensland, Australia on the Main Line (this section is now the Ipswich and Rosewood railway line. It was added to the Queensland Heritage Register on 13 November 2008.
The Bridgewater Corners Bridge carries Vermont Route 100A across the Ottauquechee River in the Bridgewater Corners village of Bridgewater, Vermont. It was built in 1928 by the American Bridge Company, following devastating flooding. It is a single-span Pratt through truss structure, and was listed on the National Register of Historic Places in 1992.
The Straight Street Bridge is a vehicular bridge over the Passaic River in Paterson, New Jersey, that is listed on the National Register of Historic Places.
The Railroad Street Bridge is a historic Pratt through truss bridge, carrying Railroad Street across the Lamoille River in Johnson, Vermont. It was built in 1928, after the state's devastating 1927 floods, and is one of its few surviving Pratt through truss bridges. It was listed on the National Register of Historic Places in 2007 as Bridge 6.
Fort Benton Bridge spans the Missouri River at the town of Fort Benton, Montana. It was built in 1888. It has also been known as Old Bridge and was listed on the National Register of Historic Places in 1980.
The Scenic Bridge crossing Clark Fork River about four miles east of Tarkio in Mineral County, Montana, was built in 1928. It is located at Milepost 0 on Old U.S. Route 10 W. It has also been denoted 24MN304 and MDT No. L31012000+08. It was listed on the National Register of Historic Places in 2010.
The Martin Road Bridge is a former road bridge which carried Martin Road across the Shiawassee River in Caledonia Township near Corunna. It was one of the oldest metal through truss highway bridges in Michigan, and was listed on the National Register of Historic Places in 1991. As of 2016, the bridge has been removed from its original site, and will be restored and reassembled at the Auburn Heights Preserve in Yorklyn, Delaware.
The Main Street Bridge, once known as the West Main Street Bridge, is a historic pony Pratt truss bridge crossing the South Branch Raritan River in Clinton of Hunterdon County, New Jersey. It was designed by Francis C. Lowthorp and built in 1870 by William Cowin of Lambertville. The bridge was added to the National Register of Historic Places on September 28, 1995 as part of the Clinton Historic District. It is one of the few early examples of iron Pratt truss bridges remaining in the United States. It was documented by the Historic American Engineering Record in 1991.
