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Streamflow Measurements for the Nation

! Streamflow measurement pages will be decommissioned in early 2026. Please find the modernized pages in WDFN that suit you best. Learn more about our modernization plans and timeline and new pages.

USGS 11183670 WALNUT C A DIAMOND BLVD BRIDGE NR CONCORD CA
Contra Costa County, California
Hydrologic Unit Code 18050001
Latitude  37°58'10.39", Longitude 122°03'13.62" NAD83
Drainage area 85.3  square miles
Gage datum 33 feet above NAVD88
Output formats
HTML table with channel data
HTML table without channel data
Tab-separated data with channel data
Tab-separated data without channel data
Graph of data
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Meas.
Number		   Date       Time Time
Datum		 Measurement
Used?		   Who Measuring
Agency		 Stream
flow
(ft3/s)		 Gage
Height
(ft)		 GH
Change
(ft)		 Meas.
Duration
(hr)		 Meas.
Rated		   Control Flow
Adjust.
Code 		 Channel
Number		 Channel
Name		 Meas.
type 		 Stream
flow
method 		 Velocity
method 		 Channel
flow
(ft3/s)		 Channel
width
(ft)		 Channel
area
(ft2)		 Channel
vel.
(ft/s)		 Channel
stability 		 Channel
material 		 Channel
evenness 		 Long.
vel.
desc. 		 Horz.
vel.
desc. 		 Vert.
vel.
desc. 		 Channel
loc.
code 		 Channel
loc.
dist.(ft)
162022-05-19 09:26:54PDTYesBDCYRUSGS7.458.800.000.40GoodClearNONE11WADEQSCMMVADV7.4510.37.421.00SOFTGRVLEVENSTDYEVENSTNDUPST100.00
152022-04-28 12:54:06PDTYesBDCYRUSGS10.78.880.010.50GoodClearNONE11WADEQSCMMVADV10.710.78.611.25SOFTGRVLEVENSTDYEVENUNKNUPST100.00
142022-04-21 10:02PDTYesBDCYRUSGS45213.04-0.040.40FairClearOTHR11BRDSQADCPVADCP44466.42441.82SOFTGRVLEVENSTDYEVENSTNDDNST40.00
132022-04-05 11:14:45PDTYesBDCYRUSGS9.638.870.000.50GoodClearNONE11WADEQSCMMVADV9.639.807.271.32SOFTGRVLUNEVSTDYEVENUNKNUPST150.00
122022-03-11 08:49:46PSTYesBDCYRUSGS9.899.010.000.50FairDebrisLightNONE11WADEQSCMMVADV9.8926.314.70.67FIRMGRVLEVENSTDYEVENSTNDDNST60.00
112022-01-28 11:15:04PSTYesBDCYRUSGS14.49.020.000.50GoodClearNONE11WADEQSCMMVADV14.426.015.40.93FIRMGRVLEVENSTDYEVENSTNDDNST50.00
102022-01-04 11:09:56PSTYesBDCYRUSGS15610.96-0.060.70GoodClearNONE11WADEQSCMMVADV15651.01021.53SOFTGRVLEVENSTDYEVENSTNDDNST100.00
92021-12-23 12:29:14PSTYesBDCYRUSGS242016.97-0.580.80Fair NONE11BRDSQSCMMVPAA24202228832.74SOFTGRVLEVENSTDYEVENSTNDDNST80.00
82021-12-16 14:31:51PSTYesBDCYRUSGS23011.71-0.140.70GoodUnspecifedNONE11WADEQSCMMVADV23055.51461.58FIRMGRVLEVENSTDYEVENSTNDDNST80.00
72021-12-13 12:30:10PSTYesLCANNAR/BDCYUSGS150015.90-0.170.70FairDebrisLightNONE11BRDSQSCMMVADCP15001505782.60FIRMsiltEVENSTDYEVENSTNDATGA0.00
62021-12-13 10:39:35PSTYesLCANNAR/BDCYUSGS127015.520.310.40PoorDebrisLightNONE21BRDSQADCPVADCP127076.93973.19FIRMsiltEVENSTDYEVENSTNDATGA0.00
62021-12-13 10:39:35PSTYesLCANNAR/BDCYUSGS127015.520.310.40PoorDebrisLightNONE12OTHRother 5.00 FIRMsiltEVENSTDYEVENSTNDATGA0.00
52021-11-22 13:36:20PSTYesBDCYRUSGS6.598.930.000.50GoodClearNONE11WADEQSCMMVADV6.5926.013.50.49FIRMsiltEVENSTDYEVENSTNDDNST90.00
42021-11-09 09:21:22PSTYesBDCYRUSGS15311.28-0.100.50GoodVegetationLightNONE11WADEQSCMMVADV15350.51091.40SOFTGRVLEVENSTDYEVENSTNDDNST100.00
32021-11-04 12:16:33PDTYesBDCYRUSGS9.879.100.000.60GoodDebrisLightNONE11WADEQSCMMVADV9.8725.018.10.55SOFTSANDEVENSTDYEVENSTNDDNST90.00
22021-01-05 12:24:40PSTYesBDCUSGS23.69.38-0.030.60GoodDebrisHeavyNONE11WADEQSCMMVADV23.620.313.41.76FIRMGRVLEVENSTDYEVENUNKNDNST50.00
12020-12-29 15:47:18PSTYesLAC/CSS/TKNUSGS6.789.09 FairDebrisLightNONE11WADEQSCMMVADV6.7813.67.530.90FIRMGRVLEVENSTDYEVENSTNDDNST100.00