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The Bollman Bridge is a two-span through-truss, resting on granite abutments at each end and a granite pier in the middle of the river. The truss structure is a mixture of wrought and cast iron. The truss configuration is the design patented by Bollman as the "Bollman suspension truss" in 1852.
Boundary Map of the Union Mills Homestead Historic District, Carroll County, at Maryland Historical Trust; Union Mills Homestead; Historic American Engineering Record (HAER) No. md-170, "Bollman Truss Bridge, Union Mills Homestead Park, 3311 Littlestown Pike, Westminster, Carroll County, MD", 1 photo, 1 photo caption page
Bollman's Bridge Patent (1852) Ilchester, Maryland, Bollman truss bridge over Patapsco River. The bridge was destroyed by a flood. On January 6, 1852, Bollman was awarded patent No. 8,624 for his unique design known as the "Bollman truss." [2] He left the B&O and founded W. Bollman and Company in 1858 with his partners John Clark and John H ...
The original bridge was a "Bollman suspension truss".The Monocacy river bridge and viaduct structures were a mixture of wrought iron tension members and cast iron compression members, including other decorative elements, such as Doric styled vertical members and end towers, all cast iron and detailed.
Originally a timber bridge, replaced with a steel trestle in 1896, and then a concrete arch in 1928. Rock Creek. The original bridge consisted of four 100-ft Bollman trusses. In 1893, the main course of Rock Creek was diverted primarily upstream of the bridge. Before the diversion, a loop in the creek caused it to run almost parallel to the bridge.
Multispan masonry bridge Bollman Suspension and Trussed Bridge: ... Bollman Truss Bullfrog Road Bridge: 1908 ... Map all coordinates using OpenStreetMap.
[16] [17] The Thomas Viaduct at Relay, Maryland, was the longest bridge in the United States upon its completion in 1835. It also remains in use. The B&O made extensive use of the Bollman iron truss bridge design in the mid-19th century. Its durability and ease of assembly aided faster railroad construction.
Built in 1836–1837, the B&O's first crossing over the Potomac was an 830-foot (250 m) covered wood truss. [2] It was the only rail crossing of the Potomac River until after the American Civil War. The single-track bridge, composed of six river spans plus a span over the Chesapeake and Ohio Canal, was designed by Benjamin Henry Latrobe, II.
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