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Lake Elsman is a 6,200-acre-foot (7,600,000 m 3) reservoir, created by an  earthen dam called Austrian Dam on  Los Gatos Creek in the Santa Cruz Mountains of California. At several points it is over 140' deep  and its normal surface area is 96 acres.  It provides 12% of San Jose Water Works' total water capacity in some years.  The lake and dam is owned by the  San Jose Water Company, 
In 1988 and 1989, two earthquakes at
M=5.3 and 5.4 respectively occurred at Lake Elsman that transferred stress that led to the 1989 M=6.9 1989 Loma Prieta earthquake. 
Construction of the Austrian Dam was completed in 1950.
Beneath the reservoir are the remains of the settlements of Austrian Gulch and Germantown.  The dam is more than 900 feet (270 m) long and 180 feet (55 m) high.  The dam was damaged in the Loma Prieta quake.  The performance of Austrian Dam during that earthquake reinforces concerns about damage to the tops of earth dams by earthquakes.  
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"Lake Elsman". Find Lakes . Retrieved 2012.
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"Dams Within the Jurisdiction of the State of California (A-G)" (PDF). California Department of Water Resources. Archived from the original (PDF) on March 9, 2012 . Retrieved 2012.
"Lake Elsman". . Geographic Names Information System United States Geological Survey.
"Lake Elsman - Santa Clara County, CA". Trails.com . Retrieved .
"Austrian Dam". . Geographic Names Information System United States Geological Survey.
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Wiley, Neil. "Lake Elsman". Mountain Network News. Mountain Network News . Retrieved 2012.
Perfettini, Hugo; Stein, Ross S.; Simpson, Robert; Cocco, Massimo (September 10, 1999). "Stress transfer by the 1988-1989 M=5.3 and 5.4 Lake Elsman foreshocks to the Loma Prieta fault' Unclamping at the site of peak mainshock slip" (PDF). . Journal of Geophysical Research 104 (B9): 20, 169-20, 182. doi: 10.1029/1999jb900092 . Retrieved 2012.
John V. Young (2002). . Great West Books. Ghost Towns of the Santa Cruz Mountains ISBN 9780944220122 . Retrieved .
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Riverside County Integrated Project (PDF). Riverside County Integrated Project. 2000. pp. Appendix H, 3-41.