Warning: Javascript must be enabled to use all the features on this page!


Page Loading - Please Wait...

Click to hideNews Bulletins

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 372744122253201 ARROYO LEON A HALF MOON BAY CA


San Mateo County, California
Hydrologic Unit Code 18050006
Latitude  37°27'44", Longitude 122°25'32" NAD27
Drainage area 8.52  square miles
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
 
311993-04-26 17:40PDTYesGMKUSGS0.03 GoodClearNONE
301993-03-18 09:09PSTYesCTPUSGS6.37 0.000.70GoodDebrisHeavyNONE
291993-02-23 07:59PSTYesCTPUSGS58.6 -0.050.90GoodDebrisHeavyNONE
281993-01-19 14:36PSTYesCTPUSGS37.8 0.000.50GoodDebrisHeavyNONE
271992-12-14 15:05PSTYesCTPUSGS0.86 0.000.50FairDebrisHeavyNONE
261992-11-18 16:45PSTYesCTPUSGS0.03 0.000.30ExcellentDebrisLightNONE
251992-04-15 09:32PDTYesCTPUSGS0.08 0.000.30ExcellentClearNONE
241992-03-10 16:15PSTYesCTPUSGS7.91 0.000.60GoodDebrisHeavyNONE
231992-02-14 12:45PSTYesJJGUSGS1122.500.400.50PoorDebrisModerateNONE
221992-01-15 09:05PSTYesCTPUSGS0.76 0.000.60FairClearNONE
211991-12-10 08:30PSTYesCTPUSGS0.07 0.000.60GoodDebrisLightNONE
201991-05-15 07:55PDTYesCTPUSGS0.38 0.000.70FairClearNONE
191991-04-17 11:30PDTYesCTPUSGS0.06 0.000.30PoorClearNONE
181991-03-29 14:55PSTYesLFTUSGS13.2 0.000.50GoodClearNONE
171991-02-14 11:20PSTYesWWAUSGS0.24 GoodClearNONE
161991-01-17 10:30PSTYesWWAUSGS0.13 0.000.10ExcellentDebrisLightNONE
151990-12-19 14:00PSTYesWWAUSGS0.34 0.000.30GoodClearNONE
141990-06-13 18:30PDTYesWWAUSGS0.06 0.000.10GoodDebrisLightNONE
131990-04-26 16:00PDTYesWWAUSGS0.89 0.000.20FairClearNONE
12E1990-03-22 13:00PSTYesKLMUSGS0.01 UnspecifiedClearNONE
111990-02-01 13:50PSTYesKLM/JJGUSGS1.22 0.000.40GoodClearNONE
101989-12-20 14:55PSTYesKLMUSGS1.08 0.000.30Good NONE
91989-11-15 13:05PSTYesERHUSGS1.51 0.000.50FairClearNONE
81989-04-11 13:05PDTYesCTPUSGS0.16 0.000.30FairClearNONE
71989-03-23 08:15PSTYesCTPUSGS10.4 0.000.50FairClearNONE
61989-02-16 10:10PSTYesCTPUSGS1.38 0.000.50FairDebrisLightNONE
51989-01-18 11:10PSTYesCTPUSGS0.80 0.000.50FairClearNONE
41988-12-15 10:05PSTYesCTPUSGS0.02 0.000.10GoodClearNONE
31988-02-19 11:15PSTYesWWA/ERHUSGS0.56 0.000.20FairClearNONE
21988-01-06 09:40PSTYesWWAUSGS2.26 0.000.40GoodClearNONE
11987-12-08 14:30PSTYesWWAUSGS4.53 0.000.50GoodClearNONE