Mile Rock Tunnel, Under Forty-eighth Avenue from Cabrillo Street to , San Francisco, San Francisco County, CA
Photo Caption Pages
Under Forty-eighth Avenue from Cabrillo Street to, San Francisco, CA
Find maps of San Francisco, CA
Documentation compiled after 1968.
Survey number HAER CA-162
Building/structure dates: 1915 initial construction
Significance: The Mile Rock tunnel was constructed in 1914 and 1915 and is an example of the whole-scale reconstruction and reconfiguration of the City of San Francisco's public works system that occurred following the 1906 earthquake. This reconstruction effort drew worldwide interest and support, and offered challenges and opportunities to engineers all over the nation. Designed by M.M O'Shaughnessy, a renowned civil engineer best known for his design of Hetch Hetchy Water System, the tunnel was the first constructed in the city that used a combination of open cut timber cribbing and boring through solid rock and represented a technological and engineering innovation in the city. It served as the storm drainage facility for the Sunset and West Mission districts and portions of the Richmond and Ingleside districts. The tunnel has experienced little modification through the years. Ongoing, occasional maintenance has occurred, but there has been no major reconstruction or redesign and the tunnel retains a high degree of integrity of location, design, setting, and workmanship.
O'Shaughnessy, Michael M.
Historic American Engineering Record (Library of Congress)
1. SITE OVERVIEW FROM ABOVE SHOWING MANHOLE, BOAT LOADING CUT AT LEFT, AND TUNNEL OUTFALL CUT AT RIGHT. VIEW TO NORTHWEST.
2. MANHOLE. VIEW TO WEST.
3. TOP OF MANHOLE, DETAIL.
4. LOOKING LANDWARD TO SOUTHEAST, PAST MANHOLE, TO ABANDONED PORTAL.
5. ABANDONED PORTAL DETAIL. VIEW TO SOUTH.
6. SEAWARD VIEW OF BOAT LANDING CUT INTO ROCK, ALSO SHOWING CEMENT POURED ATOP TUNNEL.
7. DETAIL OF BOAT LANDING, LOOKING EAST.
8. LOOKING DOWN AT OUTFALL PORTAL, LOW TIDE.
9. MILE ROCK TUNNEL DURING EXCAVATION OF OPEN CUT PORTION IN 1915. DEPARTMENT OF PUBLIC WORKS, MAP AND PLAN ROOM, PHOTO #2513.
10. DETAIL OF INTERIOR OF MILE ROCK TUNNEL UNDER CONSTRUCTION. DEPARTMENT OF PUBLIC WORKS, MAP AND PLAN ROOM, PHOTO #2115.
11. INTERIOR OF MILE ROCK TUNNEL IN 1915, SHOWING CONCRETE LINING AND WOOD CRIBBING UNDER CONSTRUCTION. Department of Public Works, Map and Plan Room, photo #2116.
12. INTERIOR OF MILE ROCK TUNNEL UNDER CONSTRUCTION IN 1915. Department of Public Works, Map and Plan Room, photo #2350.
13. INTERIOR OF MILE ROCK TUNNEL, COMPLETED AND READY FOR FINAL INSPECTION, AUGUST 1915. Department of Public Works, Map and Plan Room, photo #2512.
14. INSPECTION PARTY IN AUTO DRIVEN THROUGH MILE ROCK TUNNEL, AUG. 26, 1915. Department of Public Works, Map and Plan Room, photo #2545.
15. MILE ROCK TUNNEL INSPECTED, AUGUST 26, 1915, WITH MAYOR ROLPH AND MEMBERS OF PUBLIC WORKS BOARD PRESENT. Department of Public Works, Map and Plan Room, photo #2546.
16. SHIPWRECKS AT MILE ROCK SEWER OUTFALL, JANUARY 23, 1940. Department of Public Works, Map and Plan Room, photo #A 6271.
17. PLAN AND PROFILE. SHEET 1 OF 3. CASE A, DRAWING 782.
18. SEWER SECTIONS FOR MILE ROCK TUNNEL. SHEET 2 OF 3. CASE A, DRAWING 783.
19. MANHOLE ON 9 ' 0' X 11' 0' 11 ' 0' SEWER, SECTIONS. SHEET 3 OF 3. CASE A, DRAWING 784.
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