Photo by Steve Thuman                                   Photo by Joe Christenson

A watershed is the area where all of the water that is on or under the land drains to the same place. In other words, it is where the water from the higher elevations settle in lower elevations. Watersheds come in all shapes and sizes. They cross county, state, and national boundaries. No matter where you are, you’re in a watershed, including your home!

In more scientific terms, a watershed is the basic geographic unit that is defined by hydrology. It is an area of land that drains water to a given reference point, typically a confluence with another major creek or large water body. All land is part of a watershed. Defined by their natural hydrological functions, watersheds do not follow state, county, or city boundaries.

Contra Costa County has 31 major watersheds that drain to the Bay or Delta. Additionally, Contra Costa County includes the headwaters of creeks that drain through other counties before reaching the Bay.








Bookmark and Share