Walnut Creek (California)

The Walnut Creek mainstem is a 12.3-mile-long (19.8-kilometer) northward-flowing stream in northern California. The Walnut Creek watershed lies in central Contra Costa County, California and drains the west side of Mount Diablo and the east side of the East Bay Hills. The Walnut Creek mainstem is now mostly a concrete or earthen flood control channel until it reaches Pacheco Creek on its way to Suisun Bay. Walnut Creek was named for the abundant native Northern California walnut trees (Juglans hindsii) which lined its banks historically. The city of Walnut Creek, California was named for the creek when its post office was established in the 1860s.

This article is about the stream in Contra Costa County. For the associated city, see Walnut Creek, California. For the stream in Southern California, see Walnut Creek (Southern California).
Walnut Creek
Arroyo de Las Nueces, Arroyo de Los Nogales
Secondary beaver dam on lower Walnut Creek provides happy hunting perch for a great egret. Courtesy Cheryl Reynolds, Worth a Dam, 2013
Location of the mouth of Walnut Creek in California
Location
CountryUnited States
StateCalifornia
RegionContra Costa County
CitiesWalnut Creek, Pleasant Hill, Four Corners, Concord, Pacheco, Vine Hill, Mococo, Martinez
Physical characteristics
SourceConfluence of Las Trampas Creek and Tice Creek
 • locationWalnut Creek, California 375338N 1220335W
 • coordinates37°53′38″N 122°3′35″W
 • elevation144 ft (44 m)
MouthSuisun Bay
 • location
Martinez, California
 • coordinates
38°1′27″N 122°4′13″W
 • elevation
2 ft (0.61 m)
Basin size146 sq mi (380 km2)
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