The Watershed Project works with community groups and volunteers to monitor the health of creeks in Contra Costa County. This site explores the data we’ve collected, as well as additional data collected by other groups. To get involved in our creek monitoring program, please contact Satoko Mills.
Contra Costa County has over 20 major creeks, as identified by the Contra Costa County Watershed Atlas. Spread out through natural and urban spaces, these waterways exist in several forms: natural, concrete, or underground. An estimated 35% of the land that drains to these creeks is made up of impervious surfaces such as roads and houses, which contributes to runoff pollution during storms, as the rain is not able to filter through the soil.
Note: Shaded regions are watersheds that The Watershed Project (TWP) currently monitors, click to navigate to a creek overview page.
CEDEN (California Environmental Data Exchange Network) is a state database housing water quality data from multiple agencies and groups.