A comparison of the buildings at Banning Dr., red arrow, and SN west tunnel portal, yellow arrow, show the buildings did not survive into the 1950s. Historicaerials.com shows structures in 1946, but not in 1958. Left, BUT BUU-289-44 Aug. 2, 1939, courtesy the East Bay Municipal Utility District; center, BUT-8G-83 Mar. 30, 1950 Courtesy the East Bay Regional Park District; right, AV 253 11-23, HJW, 1-12000, May 4, 1957, courtesy Contra Costa County Public Works Department.
L96-95-USDA AAA Western Division and HJW Geospatial Inc, Pacific Aerial Surveys, Oakland CA,
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