Redridge Steel Dam, Salmon Trout River, Beacon Hill, Houghton County, ...
Significance: The water supply impounded by the log dam, built by the Atlantic Mining Company across the Salmon Trout River in 1894, proved inadequate when the Baltic Mining Company built a stamp mill on Lake S... More
Tivoli Island Bridge, Spanning Rock River Channel from mainland to wes...
Significance: In 1866, Zenas King from Ohio received a patent for an innovative tubular iron-arch design. Increasing the sectional area of the top chord toward the ends of the arch, he claimed, strengthened th... More
Tivoli Island Bridge, Spanning Rock River Channel from mainland to wes...
Significance: In 1866, Zenas King from Ohio received a patent for an innovative tubular iron-arch design. Increasing the sectional area of the top chord toward the ends of the arch, he claimed, strengthened th... More
Tivoli Island Bridge, Spanning Rock River Channel from mainland to wes...
Significance: In 1866, Zenas King from Ohio received a patent for an innovative tubular iron-arch design. Increasing the sectional area of the top chord toward the ends of the arch, he claimed, strengthened th... More
Tivoli Island Bridge, Spanning Rock River Channel from mainland to wes...
Significance: In 1866, Zenas King from Ohio received a patent for an innovative tubular iron-arch design. Increasing the sectional area of the top chord toward the ends of the arch, he claimed, strengthened th... More
Tivoli Island Bridge, Spanning Rock River Channel from mainland to wes...
Significance: In 1866, Zenas King from Ohio received a patent for an innovative tubular iron-arch design. Increasing the sectional area of the top chord toward the ends of the arch, he claimed, strengthened th... More
Tivoli Island Bridge, Spanning Rock River Channel from mainland to wes...
Significance: In 1866, Zenas King from Ohio received a patent for an innovative tubular iron-arch design. Increasing the sectional area of the top chord toward the ends of the arch, he claimed, strengthened th... More
Tivoli Island Bridge, Spanning Rock River Channel from mainland to wes...
Significance: In 1866, Zenas King from Ohio received a patent for an innovative tubular iron-arch design. Increasing the sectional area of the top chord toward the ends of the arch, he claimed, strengthened th... More
Tivoli Island Bridge, Spanning Rock River Channel from mainland to wes...
Significance: In 1866, Zenas King from Ohio received a patent for an innovative tubular iron-arch design. Increasing the sectional area of the top chord toward the ends of the arch, he claimed, strengthened th... More
Jefferson Street Viaduct, Spanning Des Moines River at U.S. Highway 63...
Significance: As one of Iowa's most handsomely proportioned highway trusses, the Jefferson Viaduct a continuous Warren deck truss is technologically noteworthy as an uncommon application of deck truss techn... More
Jefferson Street Viaduct, Spanning Des Moines River at U.S. Highway 63...
Significance: As one of Iowa's most handsomely proportioned highway trusses, the Jefferson Viaduct a continuous Warren deck truss is technologically noteworthy as an uncommon application of deck truss techn... More
Jefferson Street Viaduct, Spanning Des Moines River at U.S. Highway 63...
Significance: As one of Iowa's most handsomely proportioned highway trusses, the Jefferson Viaduct a continuous Warren deck truss is technologically noteworthy as an uncommon application of deck truss techn... More
Jefferson Street Viaduct, Spanning Des Moines River at U.S. Highway 63...
Significance: As one of Iowa's most handsomely proportioned highway trusses, the Jefferson Viaduct a continuous Warren deck truss is technologically noteworthy as an uncommon application of deck truss techn... More
Jefferson Street Viaduct, Spanning Des Moines River at U.S. Highway 63...
Significance: As one of Iowa's most handsomely proportioned highway trusses, the Jefferson Viaduct a continuous Warren deck truss is technologically noteworthy as an uncommon application of deck truss techn... More
Jefferson Street Viaduct, Spanning Des Moines River at U.S. Highway 63...
Significance: As one of Iowa's most handsomely proportioned highway trusses, the Jefferson Viaduct a continuous Warren deck truss is technologically noteworthy as an uncommon application of deck truss techn... More
Jefferson Street Viaduct, Spanning Des Moines River at U.S. Highway 63...
Significance: As one of Iowa's most handsomely proportioned highway trusses, the Jefferson Viaduct a continuous Warren deck truss is technologically noteworthy as an uncommon application of deck truss techn... More
Jefferson Street Viaduct, Spanning Des Moines River at U.S. Highway 63...
Significance: As one of Iowa's most handsomely proportioned highway trusses, the Jefferson Viaduct a continuous Warren deck truss is technologically noteworthy as an uncommon application of deck truss techn... More
Jefferson Street Viaduct, Spanning Des Moines River at U.S. Highway 63...
Significance: As one of Iowa's most handsomely proportioned highway trusses, the Jefferson Viaduct a continuous Warren deck truss is technologically noteworthy as an uncommon application of deck truss techn... More
Jefferson Street Viaduct, Spanning Des Moines River at U.S. Highway 63...
Significance: As one of Iowa's most handsomely proportioned highway trusses, the Jefferson Viaduct a continuous Warren deck truss is technologically noteworthy as an uncommon application of deck truss techn... More
Jefferson Street Viaduct, Spanning Des Moines River at U.S. Highway 63...
Significance: As one of Iowa's most handsomely proportioned highway trusses, the Jefferson Viaduct a continuous Warren deck truss is technologically noteworthy as an uncommon application of deck truss techn... More
Jefferson Street Viaduct, Spanning Des Moines River at U.S. Highway 63...
Significance: As one of Iowa's most handsomely proportioned highway trusses, the Jefferson Viaduct a continuous Warren deck truss is technologically noteworthy as an uncommon application of deck truss techn... More
Jefferson Street Viaduct, Spanning Des Moines River at U.S. Highway 63...
Significance: As one of Iowa's most handsomely proportioned highway trusses, the Jefferson Viaduct a continuous Warren deck truss is technologically noteworthy as an uncommon application of deck truss techn... More
Jefferson Street Viaduct, Spanning Des Moines River at U.S. Highway 63...
Significance: As one of Iowa's most handsomely proportioned highway trusses, the Jefferson Viaduct a continuous Warren deck truss is technologically noteworthy as an uncommon application of deck truss techn... More
Jefferson Street Viaduct, Spanning Des Moines River at U.S. Highway 63...
Significance: As one of Iowa's most handsomely proportioned highway trusses, the Jefferson Viaduct a continuous Warren deck truss is technologically noteworthy as an uncommon application of deck truss techn... More
Jefferson Street Viaduct, Spanning Des Moines River at U.S. Highway 63...
Significance: As one of Iowa's most handsomely proportioned highway trusses, the Jefferson Viaduct a continuous Warren deck truss is technologically noteworthy as an uncommon application of deck truss techn... More
Jefferson Street Viaduct, Spanning Des Moines River at U.S. Highway 63...
Significance: As one of Iowa's most handsomely proportioned highway trusses, the Jefferson Viaduct a continuous Warren deck truss is technologically noteworthy as an uncommon application of deck truss techn... More
Jefferson Street Viaduct, Spanning Des Moines River at U.S. Highway 63...
Significance: As one of Iowa's most handsomely proportioned highway trusses, the Jefferson Viaduct a continuous Warren deck truss is technologically noteworthy as an uncommon application of deck truss techn... More
Jefferson Street Viaduct, Spanning Des Moines River at U.S. Highway 63...
Significance: As one of Iowa's most handsomely proportioned highway trusses, the Jefferson Viaduct a continuous Warren deck truss is technologically noteworthy as an uncommon application of deck truss techn... More
Jefferson Street Viaduct, Spanning Des Moines River at U.S. Highway 63...
Significance: As one of Iowa's most handsomely proportioned highway trusses, the Jefferson Viaduct a continuous Warren deck truss is technologically noteworthy as an uncommon application of deck truss techn... More
Jefferson Street Viaduct, Spanning Des Moines River at U.S. Highway 63...
Significance: As one of Iowa's most handsomely proportioned highway trusses, the Jefferson Viaduct a continuous Warren deck truss is technologically noteworthy as an uncommon application of deck truss techn... More
Jefferson Street Viaduct, Spanning Des Moines River at U.S. Highway 63...
Significance: As one of Iowa's most handsomely proportioned highway trusses, the Jefferson Viaduct a continuous Warren deck truss is technologically noteworthy as an uncommon application of deck truss techn... More
Range Line Road Bridge, Spanning West Branch of Eau Claire River, on R...
Significance: The Range Line Road Bridge is a single span Warren truss consisting almost entirely of riveted angles. A distinctive feature is the continuous top chord that extends to the shoe, eliminating the ... More
Range Line Road Bridge, Spanning West Branch of Eau Claire River, on R...
Significance: The Range Line Road Bridge is a single span Warren truss consisting almost entirely of riveted angles. A distinctive feature is the continuous top chord that extends to the shoe, eliminating the ... More
Range Line Road Bridge, Spanning West Branch of Eau Claire River, on R...
Significance: The Range Line Road Bridge is a single span Warren truss consisting almost entirely of riveted angles. A distinctive feature is the continuous top chord that extends to the shoe, eliminating the ... More
Range Line Road Bridge, Spanning West Branch of Eau Claire River, on R...
Significance: The Range Line Road Bridge is a single span Warren truss consisting almost entirely of riveted angles. A distinctive feature is the continuous top chord that extends to the shoe, eliminating the ... More
Range Line Road Bridge, Spanning West Branch of Eau Claire River, on R...
Significance: The Range Line Road Bridge is a single span Warren truss consisting almost entirely of riveted angles. A distinctive feature is the continuous top chord that extends to the shoe, eliminating the ... More
Range Line Road Bridge, Spanning West Branch of Eau Claire River, on R...
Significance: The Range Line Road Bridge is a single span Warren truss consisting almost entirely of riveted angles. A distinctive feature is the continuous top chord that extends to the shoe, eliminating the ... More
Range Line Road Bridge, Spanning West Branch of Eau Claire River, on R...
Significance: The Range Line Road Bridge is a single span Warren truss consisting almost entirely of riveted angles. A distinctive feature is the continuous top chord that extends to the shoe, eliminating the ... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Apalachicola River Bridge, State Route 20 spanning the Apalachicola Ri...
Significance: This structure is significant as the first long-span steel bridge and first continuous truss bridge built in Florida. As the third bridge in the state to cross the Apalachicola River, a major wate... More
Bridge of Pines, Ermatinger Drive in Irvine Park, Chippewa Falls, Chip...
Significance: In 1906, the city of Chippewa Falls established Irvine Park. The Bridge of Pines represents two phases of the park's development, In 1907 the Wisconsin Bridge and Iron Company erected a one-span... More
Bridge of Pines, Ermatinger Drive in Irvine Park, Chippewa Falls, Chip...
Significance: In 1906, the city of Chippewa Falls established Irvine Park. The Bridge of Pines represents two phases of the park's development, In 1907 the Wisconsin Bridge and Iron Company erected a one-span... More
Bridge of Pines, Ermatinger Drive in Irvine Park, Chippewa Falls, Chip...
Significance: In 1906, the city of Chippewa Falls established Irvine Park. The Bridge of Pines represents two phases of the park's development, In 1907 the Wisconsin Bridge and Iron Company erected a one-span... More