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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 11185185 SUISUN BAY A MALLARD IS CA
Contra Costa County, California
Hydrologic Unit Code 18050001
Latitude  38°02'34", Longitude 121°55'09" NAD27
Gage datum 0 feet above NGVD29
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
Reselect output format
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 
572014-01-15 15:49PSTYesTM/SHUSGS46700 Unspecified NONE
562014-01-15 15:33PSTYesTM/SHUSGS-18100 Unspecified NONE
552014-01-15 15:15PSTYesTM/SHUSGS-79800 Unspecified NONE
542014-01-15 14:57PSTYesTM/SHUSGS-146000 Unspecified NONE
532014-01-15 14:38PSTYesTM/SHUSGS-197000 Unspecified NONE
522014-01-15 14:17PSTYesTM/SHUSGS-257000 Unspecified NONE
512014-01-15 13:58PSTYesTM/SHUSGS-285000 Unspecified NONE
502014-01-15 13:39PSTYesTM/SHUSGS-317000 Unspecified NONE
492014-01-15 13:20PSTYesTM/SHUSGS-331000 Unspecified NONE
482014-01-15 12:58PSTYesTM/SHUSGS-358000 Unspecified NONE
472014-01-15 12:35PSTYesTM/SHUSGS-364000 Unspecified NONE
462014-01-15 12:14PSTYesTM/SHUSGS-360000 Unspecified NONE
452014-01-15 11:32PSTYesTM/SHUSGS-309000 Unspecified NONE
442014-01-15 11:13PSTYesTM/SHUSGS-268000 Unspecified NONE
432014-01-15 10:57PSTYesTM/SHUSGS-239000 Unspecified NONE
422014-01-15 10:45PSTYesTM/SHUSGS-209000 Unspecified NONE
412013-02-13 14:42PSTYesAMP/TVDUSGS-2760004.41 Unspecified NONE
402013-02-13 14:27PSTYesAMP/TVDUSGS-2380004.26 Unspecified NONE
392013-02-13 14:12PSTYesAMP/TVDUSGS-2140004.07 Unspecified NONE
382013-02-13 13:58PSTYesAMP/TVDUSGS-1670003.87 Unspecified NONE
372013-02-13 13:41PSTYesAMP/TVDUSGS-1090003.61 Unspecified NONE
362013-02-13 13:22PSTYesAMP/TVDUSGS-408003.29 Unspecified NONE
352013-02-13 13:04PSTYesAMP/TVDUSGS61902.99 Unspecified NONE
342013-02-13 12:32PSTYesAMP/TVDUSGS1380002.45 Unspecified NONE
332013-02-13 12:09PSTYesAMP/TVDUSGS1940002.14 Unspecified NONE
322013-02-13 11:44PSTYesAMP/TVDUSGS2620001.93 Unspecified NONE
312013-02-13 11:22PSTYesAMP/TVDUSGS2900001.85 Unspecified NONE
302013-02-13 11:01PSTYesAMP/TVDUSGS3220001.84 Unspecified NONE
292013-01-17 16:15PSTYesTMK/CJSUSGS-507003.56 Unspecified NONE
282013-01-17 16:04PSTYesTMK/CJSUSGS-296003.43 Unspecified NONE
272013-01-17 15:52PSTYesTMK/CJSUSGS88003.28 Unspecified NONE
262013-01-17 15:40PSTYesTMK/CJSUSGS372003.13 Unspecified NONE
252013-01-17 15:28PSTYesTMK/CJSUSGS768002.99 Unspecified NONE
242013-01-17 15:16PSTYesTMK/CJSUSGS989002.86 Unspecified NONE
232013-01-17 15:04PSTYesTMK/CJSUSGS1390002.72 Unspecified NONE
222013-01-17 14:53PSTYesTMK/CJSUSGS1620002.60 Unspecified NONE
212013-01-17 14:42PSTYesTMK/CJSUSGS1910002.50 Unspecified NONE
202013-01-17 14:30PSTYesTMK/CJSUSGS2080002.41 Unspecified NONE
192013-01-17 14:17PSTYesTMK/CJSUSGS2410002.34 Unspecified NONE
182013-01-17 13:18PSTYesTMK/CJSUSGS3150002.25 Unspecified NONE
172013-01-17 12:24PSTYesTMK/CJSUSGS3450002.50 Unspecified NONE
162013-01-17 12:07PSTYesTMK/CJSUSGS3480002.61 Unspecified NONE
152013-01-17 11:48PSTYesTMK/CJSUSGS3510002.71 Unspecified NONE
142013-01-17 11:30PSTYesTMK/CJSUSGS3420002.84 Unspecified NONE
132013-01-17 11:12PSTYesTMK/CJSUSGS3300003.00 Unspecified NONE
122013-01-17 10:55PSTYesTMK/CJSUSGS3120003.15 Unspecified NONE
112013-01-17 09:54PSTYesTMK/CJSUSGS1880003.84 Unspecified NONE
102013-01-17 09:34PSTYesTMK/CJSUSGS1280004.13 Unspecified NONE
92013-01-10 14:58PSTYesAMP/PABUSGS1390005.48 Unspecified NONE
82013-01-10 14:39PSTYesAMP/PABUSGS580005.84 Unspecified NONE
72013-01-10 13:25PSTYesAMP/PABUSGS-2610006.77 Unspecified NONE
62013-01-10 13:06PSTYesAMP/PABUSGS-3000006.86 Unspecified NONE
52013-01-10 12:27PSTYesAMP/PABUSGS-3840006.88 Unspecified NONE
42013-01-10 12:09PSTYesAMP/PABUSGS-3980006.84 Unspecified NONE
32013-01-10 10:58PSTYesAMP/PABUSGS-4160006.41 Unspecified NONE
22013-01-10 10:33PSTYesAMP/PABUSGS-3930006.18 Unspecified NONE
12013-01-10 10:14PSTYesAMP/PABUSGS-3800005.98 Unspecified NONE