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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 11046370 SAN MATEO C A SAN ONOFRE CA
San Diego County, California
Hydrologic Unit Code 18070301
Latitude  33°23'28", Longitude 117°35'23" NAD27
Drainage area 132  square miles
Gage datum 20.00 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 
582003-01-06 12:00PSTYesJLAUSGS0.04 Fair NONE
572002-12-05 11:41PSTYesJLAUSGS0.05 Fair NONE
562002-11-13 10:55PSTYesJLAUSGS0.08 Fair NONE
552002-10-03 08:28PDTYesJLAUSGS0.08 Fair NONE
542002-08-27 11:30PDTYesJLAUSGS0.19 Fair NONE
532002-08-08 09:16PDTYesJLAUSGS0.11 Fair NONE
522002-07-03 08:35PDTYesJLAUSGS0.36 Fair NONE
512002-04-04 11:40PSTYesJLAUSGS0.29 Fair NONE
502001-11-14 11:53PSTYesJLAUSGS0.23 Fair NONE
492001-10-02 11:20PDTYesJLAUSGS0.27 Fair NONE
482001-09-05 07:40PDTYesJLAUSGS0.37 Poor NONE
472001-08-01 11:40PDTYesJLAUSGS0.22 Poor NONE
462001-07-06 07:15PDTYesJLAUSGS0.39 Fair NONE
452001-06-05 14:41PDTYesJLAUSGS0.34 Fair NONE
442001-05-03 14:15PDTYesJLAUSGS0.46 Fair NONE
432001-04-03 10:00PDTYesJLAUSGS0.42 Poor NONE
422001-03-12 11:50PSTYesJLAUSGS10.7 Fair NONE
412001-02-07 11:30PSTYesJLAUSGS0.22 Poor NONE
402001-01-10 11:20PSTYesKSSUSGS0.04 Poor NONE
392000-12-06 12:20PSTYesJLAUSGS0.25 Poor NONE
382000-11-06 14:10PSTYesJLAUSGS0.47 Poor NONE
372000-10-05 14:00PDTYesJLAUSGS0.26 Poor NONE
362000-09-07 11:15PDTYesJLAUSGS0.34 Poor NONE
352000-08-03 09:15PDTYesJLAUSGS0.38 Fair NONE
342000-07-07 09:00PDTYesJLAUSGS0.42 Fair NONE
332000-06-08 12:15PDTYesJLAUSGS0.50 Poor NONE
322000-05-02 15:00PDTYesJLAUSGS0.52 Fair NONE
312000-04-04 10:00PDTYesJLAUSGS0.58 Fair NONE
302000-03-02 12:45PSTYesJLAUSGS0.58 Fair NONE
292000-02-02 12:45PSTYesJLAUSGS0.41 Poor NONE
282000-01-10 12:35PSTYesJLAUSGS0.43 Fair NONE
271999-12-01 10:30PSTYesJLAUSGS0.47 Fair NONE
261999-11-04 13:00PSTYesJLAUSGS0.52 Fair NONE
251999-10-08 11:40PDTYesJLAUSGS0.56 Fair NONE
241999-09-08 14:15PDTYesJLAUSGS0.31 Poor NONE
231999-08-11 12:00PDTYesJLAUSGS0.50 Poor NONE
221999-07-08 11:30PDTYesJLAUSGS0.62 Poor NONE
211999-06-14 16:40PDTYesJAUSGS0.64 Poor NONE
201999-05-05 14:10PDTYesJLAUSGS0.67 Fair NONE
191999-04-06 11:10PDTYesJLAUSGS0.68 Fair NONE
181999-03-02 10:20PSTYesJLA/KSSUSGS0.72 Fair NONE
171999-02-05 12:00PSTYesJLAUSGS0.71 Fair NONE
161999-01-05 11:45PSTYesJLAUSGS0.66 Fair NONE
151998-12-03 12:10PSTYesJLAUSGS0.68 Fair NONE
141998-11-06 13:10PSTYesJLA/KSSUSGS0.84 Poor NONE
131998-10-09 12:10PDTYesJLAUSGS0.86 Poor NONE