Bon Tempe Lake is a reservoir in Marin County, California, managed by the Marin Municipal Water District. It is the widest lake in the Mount Tamalpais watershed, and on Lagunitas Creek. Beneath its dam is Alpine Lake. Lake Lagunitas is immediately to its east.
Fishing and hiking are activities around the lake. Rainbow trout and both largemouth and smallmouth bass are caught in the lake.
The California Office of Environmental Health Hazard Assessment released a warning regarding eating fish caught from this lake based on the elevated mercury level.
