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Scheduled Maintenance Notice
USGS will be performing maintenance on the time series data processing system beginning at 09:00 EDT on September 10, 2026. During this period, delivery of the latest time series data will be delayed. The maintenance is expected to finish within 2 hours, after which all backlogged time series data will be processed and delivered to WDFN web portals and APIs.

Available data

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2 data types available - data from 2021-11-01 to 2022-06-01

3 data types available - data from 2021-11-01 to 2022-05-30

2 data types available - data from 2020-12-29 to 2022-05-19

7 Observed properties (data types) available - with data from 2021-11-04 to 2022-05-19

72 Sampling activities

3 data types available - data from 2021-11-01 to 2022-05-30

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Metadata Element	Location Metadata	Metadata Code
Agency	U.S. Geological Survey	USGS
Location identification number	11183670	n/a
Location name	WALNUT C A DIAMOND BLVD BRIDGE NR CONCORD CA	n/a
Site type	Stream	ST
Decimal latitude (WGS84)	37.96955277777778	n/a
Decimal longitude (WGS84)	-122.05378333333333	n/a
Latitude-longitude method	Interpolated from Digital MAP.	N
Latitude-longitude accuracy	Accurate to + or - .5 sec (PLGR/PPS GPS).	5
District	California	06
State	California	06
County	Contra Costa County	013
Country	United States of America	n/a
Altitude of gage/land surface	33 feet	n/a
Method altitude determined	Interpolated from Digital Elevation Model	N
Altitude accuracy	1.6 feet	n/a
Altitude datum	North American Vertical Datum of 1988	NAVD88
Subbasin hydrologic unit	Suisun Bay	18050001
Drainage basin		n/a
Date of first construction		n/a
Drainage area	85.3 square miles	n/a
Contributing drainage area		n/a
Time zone abbreviation	PST	n/a
Site honors Daylight Saving Time	Y	n/a
National aquifer		n/a
Local aquifer		n/a
Local aquifer type		n/a
Well depth		n/a
Hole depth		n/a
Source of depth data		n/a