Creek Description

Walnut Creek runs from Mount Diablo and the East Bay Hills through the Cities of Walnut Creek, Pleasant Hill, Lafayette, and Danville before reaching the Carquinez Strait. 70% of its 29 miles are natural, with no obvious reinforcements or concrete channel. 45% of its watershed (the land that drains to the creek) is residential, while 30% is covered by impervious surfaces such as roads and houses. This large watershed encompasses over 90,000 acres and contains many smaller creeks that enter the main stem of Walnut Creek, including Grayson Creek.