USGS Home
Contact USGS
Search USGS

National Water Information System: Web Interface

USGS Water Resources   

Data Category:
Home Current Conditions Site Information Mapper Surface Water Groundwater Water Quality Water Use Revisions Geographic Area:
United States Alabama Alaska American Samoa Arizona Arkansas British Columbia California Canton and Enderbury Islands Colorado Connecticut Delaware Dist. of Columbia Florida Georgia Guam Hawaii Idaho Illinois Indiana Iowa Johnston Atoll Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Midway Islands Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Northern Mariana Islands Ohio Oklahoma Oregon Pennsylvania Puerto Rico Rhode Island Ryukyu Islands, Southern South Carolina South Dakota Swan Islands Tennessee Texas Trust Territories, Pacific Is U.S.Misc Caribbean Islands U.S.Misc Pacific Islands Utah Vermont Virgin Islands Virginia Wake Island Washington West Virginia Wisconsin Wyoming

Page Loading - Please Wait...

DESCRIPTION:

Latitude 37°46'23",   Longitude 121°59'37"   NAD27

Contra Costa County, California, Hydrologic Unit 18050001

Drainage area: 5.89 square miles

Datum of gage: 549.17 feet above   NAVD88.

AVAILABLE DATA:

Data Type	Begin Date	End Date	Count
Current / Historical Observations     (availability statement)	1987-10-01	2025-09-02
Daily Data
Discharge, cubic feet per second	1952-10-01	2025-09-01	26634
Daily Statistics
Discharge, cubic feet per second	1952-10-01	2025-07-22	26593
Monthly Statistics
Discharge, cubic feet per second	1952-10	2025-07
Annual Statistics
Discharge, cubic feet per second	1953	2025
Peak streamflow	1952-12-07	2024-02-18	72
Field measurements	1952-12-07	2025-07-23	657
Field/Lab water-quality samples (Legacy QW is frozen as of March 2024, newer data may be found on MLP)	2017-04-05	2017-05-13	21
Water-Year Summary	2005	2024	20
Revisions	Loading...

OPERATION:

Record for this site is maintained by the USGS California Water Science Center

Email questions about this site to California Water Science Center Water-Data Inquiries