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The National Register of Historic Places in the United States is a register including buildings, sites, structures, districts, and objects. The Register automatically includes all National Historic Landmarks as well as all historic areas administered by the U.S. National Park Service. Since its introduction in 1966, more than 90,000 separate listings have been added to the register.
The Jones and Laughlin Steel Corporation began as the American Iron Company, founded in 1852 by Bernard Lauth and Benjamin Franklin Jones, a few miles south of Pittsburgh along the Monongahela River. Lauth's interest was bought in 1854 by James Laughlin. The first firm to bear the name of Jones and Laughlin was organized in 1861 and headquartered at Third & Ross in downtown Pittsburgh.
The Wisconsin Bridge and Iron Company (WB&I) was a fabricator and erector of iron and steel bridges and other large structures.
The Kansas City Bridge Company was a bridge building company that built many bridges throughout the Midwest United States in the early 1900s. The company was founded in 1893 and ceased business around 1960.
The Cambria Iron Company of Johnstown, Pennsylvania was a major 19th-century industrial producer of iron and steel. Founded in 1852, it had the nation's largest steel foundry in the 1870s, and was renamed the Cambria Steel Company in 1898. The company used many innovations in the steelmaking process, including those of William Kelly and Henry Bessemer. The company was acquired in 1923 by the Bethlehem Steel Company. The company's historic facilities, extending some 12 miles (19 km) along the Conemaugh and Little Conemaugh Rivers, are a National Historic Landmark District.
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 Western Bridge and Construction Company, located in Omaha, Nebraska, was one of the foremost bridge engineering and manufacturing companies in the Midwestern United States. Several of their bridges are now listed on the National Register of Historic Places. Their headquarters were located in the Bee Building in Downtown Omaha.
The Keystone Bridge Company, founded in 1865 by Andrew Carnegie, was an American bridge building company. It was one of the 28 companies absorbed into the American Bridge Company in 1900. The company advertised its services for building steel, wrought iron, wooden railway and road bridges. It held a patent for wrought iron bridges and also supplied wrought iron columns for buildings. Thomas Carnegie worked for Keystone Bridge as treasurer for roughly 20 years, from the founding of the company until his death in 1886.
Canton Bridge Company was a firm that was later incorporated into the American Bridge Company. The firm was established in Canton, Ohio in 1892 and became one of the nation's biggest bridge-builders during the early 20th century. It designed and/or built many bridges that later became listed on the U.S. National Register of Historic Places (NRHP).
The Missouri Valley Bridge & Iron Co., also known as Missouri Valley Bridge Company, was a engineering, construction, and steel fabrication firm that operated through the late nineteenth and most of the twentieth centuries. It was based in Leavenworth, Kansas, with a WWII facility in Evansville, Indiana.
Topeka Bridge & Iron Co. was a bridge company. Its works include many bridges that are now listed on the U.S. National Register of Historic Places. Its Canyon Diablo Bridge was a concrete Luten arch bridge built in 1914. Its Amelia Park Bridge, for another example, was built in 1914.
Daniel B. Luten also known as Daniel Benjamin Luten was an American bridge builder and engineer based in Indianapolis, Indiana.
Fargo Bridge & Iron Co. was a bridge company based in North Dakota in the early part of the 20th century.
Standard Bridge Company was an American bridge company that was "one of the most important bridge building firms in Nebraska history."
Monarch Engineering Co. was an American firm of Denver, Colorado, active in engineering and construction services. John A. Crook and his brother, Guy A. Crook of Falls City, were founders of the Monarch Engineering company which had its origin and main offices at Falls City, with offices in Kansas City, and Denver. Under the management of these men the Monarch Engineering company had risen to become an important and prosperous concern and a vast amount of bridge construction, city paving, irrigation-dam building, and public building work has been done under their supervision. Within ten years after the firm had been in operation, or since 1908, its activities constantly increased and in 1917 they purchased the Denver Steel and Iron Works in order to facilitate the material supply part of the construction work in which they were engaged.
The Illinois Steel Company was an American steel producer with five plants in Illinois and Wisconsin. Founded through a consolidation in 1889, Illinois Steel grew to become the largest steel producer in the United States. In 1898, several other steel and transportation companies were merged into it to form the Federal Steel Company, itself merged into U.S. Steel in 1901.
The Virginia Bridge & Iron Co., also known as Virginia Bridge Company, was a bridge company based in Roanoke, Virginia.
The Omaha Structural Steel Works was a company also known as Omaha Steel Works and as Omaha Structural Steel Bridge Co.in Omaha, Nebraska
The Pittsburgh-Des Moines Steel Company, and often referred to as Pitt-Des Moines Steel or PDM was an American steel fabrication company. It operated from 1892 until approximately 2002 when its assets were sold to other companies, including Chicago Bridge & Iron Company. The company began as a builder of steel water tanks and bridges. It also later fabricated the "forked" columns for the World Trade Center in the 1960s, and was the steel fabricator and erector for the Gateway Arch in St. Louis. A number of its works are listed on the National Register of Historic Places.
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