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Contra Costa Watershed Forum

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Marsh Creek

Watershed Size 60066.05 acres
Length of Longest Branch of Creek 34.57 miles
Total Channel Length in Watershed 167.18 miles
Average Annual Rainfall 16.56 inches
Estimated Mean Daily Flow 28.27 cfs
Estimated 100-Year Flood Flow 5740 cfs*
Highest Elevation in Watershed 3849 feet
Population (estimated) 38500 people
Estimated Percent Impervious 15.00%
Recognized Pollutants of Concern Mercury & Metals**