Its mouth is located at an elevation of 866 feet (264 meters) at its confluence with the North Fork Pacheco Creek.
Its source is located at 37°13′39″N 121°26′20″W / 37.22750°N 121.43889°W / 37.22750; -121.43889 on the south flank of Bear Mountain in the Diablo Range in Santa Clara County.
It is now a reservoir, originally named Murray Lake, on the upper reach of Mississippi Creek.
The lake was originally named after its builder Murray Hopkins who not only built the reservoir, but the 40 miles of County Line Road along the crest of the Diablo Range between San Antonio Valley and Fifield Ranch.
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