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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 10263675 BIG ROCK C WASH A HWY 138 NR LLANO CA
Los Angeles County, California
Hydrologic Unit Code 18090206
Latitude  34°30'21", Longitude 117°50'45" NAD27
Drainage area 53.1  square miles
Output formats
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HTML table without channel data
Tab-separated data with channel data
Tab-separated data without channel 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)
221993-03-17 10:30PSTYesERHUSGS61.1 PoorClearNONE1Imported Channel 1WADEunspeunkno61.116.714.64.18UNSPUNSPUNSPunknUNSPUNSPUNSP
21W1993-03-11 13:55PSTYesERHUSGS52.4 PoorClearNONE1Imported Channel 1WADEunspeunkno52.416.814.13.72UNSPUNSPUNSPunknUNSPUNSPUNSP
20W1993-01-21 09:15PSTYesERHUSGS82.1 PoorClearNONE1Imported Channel 1WADEunspeunkno82.131.521.03.91UNSPUNSPUNSPunknUNSPUNSPUNSP
10W1992-06-17 12:35PDTYesMJD/JGHUSGS0.604.84 Fair NONE1Imported Channel 1OTHRother 0.60 UNSPUNSPUNSPunknUNSPUNSPUNSP
9W1992-06-11 09:20PDTYesJCB/JLOUSGS1.374.960.000.30Fair NONE1Imported Channel 1WADEunspeunkno1.379.501.880.73UNSPUNSPUNSPunknUNSPUNSPUNSP
191992-06-11 09:00PDTYesJCB/JLOUSGS0.282.060.000.20Fair NONE1Imported Channel 1WADEunspeunkno0.285.300.470.60UNSPUNSPUNSPunknUNSPUNSPUNSP
181992-05-15 11:20PDTYesJCB/JLOUSGS8.462.520.000.20FairDebrisHeavyNONE1Imported Channel 1WADEunspeunkno8.469.004.601.84UNSPUNSPUNSPunknUNSPUNSPUNSP
8W1992-05-15 10:45PDTYesJCB/JLOUSGS33.95.500.200.40GoodDebrisHeavyNONE1Imported Channel 1WADEunspeunkno33.926.014.92.28UNSPUNSPUNSPunknUNSPUNSPUNSP
7W1992-05-12 16:20PDTYesJCB/JLOUSGS32.45.60 GoodDebrisHeavyNONE1Imported Channel 1WADEunspeunkno32.427.014.12.30UNSPUNSPUNSPunknUNSPUNSPUNSP
171992-05-12 15:30PDTYesJCB/JLOUSGS7.932.42 FairDebrisHeavyNONE1Imported Channel 1WADEunspeunkno7.9312.04.021.97UNSPUNSPUNSPunknUNSPUNSPUNSP
161992-04-30 14:30PDTYesJCBUSGS8.95 PoorDebrisHeavyNONE1Imported Channel 1WADEunspeunkno8.9512.04.052.21UNSPUNSPUNSPunknUNSPUNSPUNSP
6W1992-04-30 08:20PDTYesJCBUSGS49.95.420.000.30FairDebrisHeavyNONE1Imported Channel 1WADEunspeunkno49.930.012.14.12UNSPUNSPUNSPunknUNSPUNSPUNSP
5W1992-03-12 12:10PSTYesJAUSGS5.56 FairDebrisHeavyNONE1Imported Channel 1WADEunspeunkno5.568.002.642.11UNSPUNSPUNSPunknUNSPUNSPUNSP
151992-03-12 11:35PSTYesJAUSGS10.8 FairDebrisHeavyNONE1Imported Channel 1WADEunspeunkno10.817.04.442.43UNSPUNSPUNSPunknUNSPUNSPUNSP
4W1992-02-18 17:00PSTYesJAUSGS3.10 FairClearNONE1Imported Channel 1WADEunspeunkno3.108.502.241.38UNSPUNSPUNSPunknUNSPUNSPUNSP
3W1992-02-13 10:05PSTYesJAUSGS40.57.89-0.050.20PoorClearNONE1Imported Channel 1WADEunspeunkno40.518.010.23.97UNSPUNSPUNSPunknUNSPUNSPUNSP
141992-02-13 09:45PSTYesJAUSGS1344.410.060.30PoorClearNONE1Imported Channel 1WADEunspeunkno13452.031.44.27UNSPUNSPUNSPunknUNSPUNSPUNSP
131992-02-12 09:30PSTYesJAUSGS1384.150.000.30PoorClearNONE1Imported Channel 1WADEunspeunkno13844.031.54.38UNSPUNSPUNSPunknUNSPUNSPUNSP
2W1992-02-11 11:20PSTYesJAUSGS54.86.03-0.030.20PoorClearNONE1Imported Channel 1WADEunspeunkno54.822.513.64.03UNSPUNSPUNSPunknUNSPUNSPUNSP
121992-02-11 09:25PSTYesJAUSGS2984.38-0.130.40PoorClearNONE1Imported Channel 1WADEunspeunkno29887.056.85.25UNSPUNSPUNSPunknUNSPUNSPUNSP
111991-04-18 13:05PDTYesJAUSGS2.081.90-0.010.50FairClearNONE1Imported Channel 1WADEunspeunkno2.088.502.440.85UNSPUNSPUNSPunknUNSPUNSPUNSP
101991-04-17 10:40PDTYesJAUSGS1.871.860.000.40FairClearNONE1Imported Channel 1WADEunspeunkno1.877.001.821.03UNSPUNSPUNSPunknUNSPUNSPUNSP
91991-03-05 14:07PSTYesJAUSGS10.22.18-0.010.40PoorClearNONE1Imported Channel 1WADEunspeunkno10.212.04.432.30UNSPUNSPUNSPunknUNSPUNSPUNSP
81991-03-02 10:05PSTYesJAUSGS11.92.220.000.50FairClearNONE1Imported Channel 1WADEunspeunkno11.911.24.442.68UNSPUNSPUNSPunknUNSPUNSPUNSP
1W1991-03-01 10:00PSTYesJAUSGS1065.60-0.060.20PoorClearNONE1Imported Channel 1WADEunspeunkno10638.020.35.22UNSPUNSPUNSPunknUNSPUNSPUNSP
71991-03-01 09:17PSTYesJAUSGS1283.030.360.20PoorClearNONE1Imported Channel 1WADEunspeunkno12835.021.45.98UNSPUNSPUNSPunknUNSPUNSPUNSP
61989-02-27 16:40PSTYesJAUSGS0.863.51-0.010.50FairClearNONE1Imported Channel 1WADEunspeunkno0.865.201.360.63UNSPUNSPUNSPunknUNSPUNSPUNSP
51989-02-16 12:40PSTYesJAUSGS0.383.430.000.30FairClearNONE1Imported Channel 1WADEunspeunkno0.383.550.760.50UNSPUNSPUNSPunknUNSPUNSPUNSP
41988-12-27 10:10PSTYesJAUSGS3.473.630.060.40FairIceCoverNONE1Imported Channel 1WADEunspeunkno3.4710.04.050.86UNSPUNSPUNSPunknUNSPUNSPUNSP
31988-12-22 11:05PSTYesJAUSGS4.323.670.000.40FairClearNONE1Imported Channel 1WADEunspeunkno4.329.703.591.20UNSPUNSPUNSPunknUNSPUNSPUNSP
21988-12-16 09:15PSTYesJAUSGS2.593.600.010.40FairClearNONE1Imported Channel 1WADEunspeunkno2.599.002.451.06UNSPUNSPUNSPunknUNSPUNSPUNSP
11988-12-12 12:30PSTYesJAUSGS0.103.300.000.10GoodClearNONE1Imported Channel 1OTHRQFLUM 0.10 UNSPUNSPUNSPunknUNSPUNSPUNSP