BR_M24085_ExtgPln_infoonly.pdf

These engineering drawings are detailed technical schematics for the Columbia River Bridge (Astoria-Megler Bridge) produced by the Oregon State Highway Department's Bridge Division. The documents provide comprehensive plan and elevation views, including detailed specifications for various bridge components such as viaduct contracts, deck details, pile caps, core details, and structural elements like expansion piers, railings, and bridge spans. The drawings include precise measurements, reinforcement specifications, concrete class requirements, and alternate construction sequences for different bridge sections, with scales ranging from 1:40 to 1:500 and multiple detailed cross-sectional views.

The technical drawings are specifically for the bridge located in Astoria, Oregon, spanning the Columbia River between Oregon and Washington. They include intricate engineering details such as prestressed pile specifications, deck build-up instructions, reinforcement bar configurations, concrete strength requirements (4000 psi at 28 days), and specific notes about material tolerances, construction sequences, and structural integrity considerations. The documents appear to be part of a comprehensive engineering and construction planning set, dated between 1963 and 1966, and include multiple alternates and detailed structural components to support the bridge's complex engineering requirements across different spans and structural elements.