8.5x11, looseleaf mimeographed report, 30 pp. plus 14 fold-out exhibits, including two foldout maps depicting Oakland and Alameda and a dozen exhibits displaying technical details of the proposed tunnel and tube.The Posey and Webster Street Tubes are two parallel underwater tunnels connecting the cities of Oakland and Alameda, California, running beneath the Oakland Estuary. Both are immersed tubes, constructed by sinking precast concrete segments to a trench in the Estuary floor, then sealing them together to create a tunnel. The Posey Tube, completed in 1928, carries one-way (Oakland-bound) ... View More...
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