War Department Corps of Engineers U.S. Army. 1934.
Five blue print maps/diagrams, sheet size 21 x 32 inches, two staples at left edge. A few small corner creases; very good condition. Includes General Site Map, Spillway Dam Plan and Section of Foundation Exploration, Typical Sections Spillway Dam & Abutments, Spillway Dam Cofferdam Layout, and Spillway Dam Crib Sections. Plus smaller diagram stapled to front "Summary Hydragraph Columbia River at Bonneville" Item #53086