historic context of maryland highway bridges built between 1948 ...
historic context of maryland highway bridges built between 1948 ...
historic context of maryland highway bridges built between 1948 ...
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SECTIONSIXResults <strong>of</strong> Field Investigationsenvisioned in the 1938 Primary Bridge Program by the State Roads Commission. Its completionin 1957 was an important milestone in the nation‘s interstate <strong>highway</strong> system. The construction<strong>of</strong> the tunnel‘s approach road, the Harbor Tunnel Thruway (now I 895), was an integral part <strong>of</strong>the Baltimore Harbor Tunnel project. Whitman, Requardt & Associates (WR&A) served as theconsulting bridge engineer in the design <strong>of</strong> the bridge which carried the Harbor Tunnel Thruwayover the tracks <strong>of</strong> the Baltimore & Ohio (B&O Railroad). The B&O placed several restrictionson the bridge‘s design, allowing only one pier skewed 45 degrees to fit <strong>between</strong> the existingtracks and a large sanitary trunk sewer in the 1,000 foot-long railroad track area. Based on theseand other considerations, WR&A chose a ―K‖ truss design, a highly unusual and complex designfor this bridge. Completed in 1957, the I 895 Bridge over the CSX tracks remains the only<strong>highway</strong> bridge utilizing a ―K‖ truss design <strong>built</strong> in Maryland.National Register <strong>of</strong> Historic Places Eligibility:The I 895 Bridge (MIHP # B-4632, Bridge BC07800) over the CSX (formerly Baltimore &Ohio) Railroad tracks is National Register-eligible under Criterion A on the state level for its<strong>historic</strong>al association with the construction <strong>of</strong> the Baltimore Harbor Tunnel, with the period <strong>of</strong>significance <strong>of</strong> 1957. Completion <strong>of</strong> the tunnel was one <strong>of</strong> four major bridge/tunnel constructionprojects envisioned in the 1938 Primary Bridge Program by the State Roads Commission. Itscompletion in 1957 was an important milestone in the nation‘s interstate <strong>highway</strong> system. Theconstruction <strong>of</strong> the tunnel‘s approach road, the Harbor Tunnel Thruway (now I 895), was anintegral part <strong>of</strong> the Baltimore Harbor Tunnel project.The I 895 Bridge over the CSX tracks is not associated with an individual on the local, state, ornational level and is not National Register-eligible under Criterion B.The I 895 Bridge over the CSX tracks is National Register-eligible under Criterion C on the statelevel as the only <strong>highway</strong> bridge using a ―K‖ truss design <strong>built</strong> in Maryland, with a period <strong>of</strong>significance <strong>of</strong> 1957. Whitman, Requardt & Associates (WR&A) served as the consulting bridgeengineer in the design <strong>of</strong> the bridge which carried the Harbor Tunnel Thruway over the tracks <strong>of</strong>the Baltimore & Ohio (B&O Railroad). The B&O placed several restrictions on the bridge‘sdesign, allowing only one pier skewed 45 degrees to fit <strong>between</strong> the existing tracks and a largesanitary trunk sewer in the 1,000 foot-long railroad track area. Based on these and otherconsiderations, WR&A chose the ―K‖ truss design, a highly unusual and complex design for thisbridge.National Register-eligibility under Criterion D was not investigated as a part <strong>of</strong> this study.\15-SEP-11\\ 7-7