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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 12200730 UNNAMED TRIBUTARY DAVIS BAY ON LOPEZ ISLAND, WA
San Juan County, Washington
Hydrologic Unit Code 17110003
Latitude  48°28'05", Longitude 122°55'08" NAD27
Drainage area 2.03  square miles
Output formats
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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)
211998-04-16 16:06PDTYesdtsUSGS0.005.11 UnspecifiedClearNONE1Imported Channel 1UNSPother 0.00 UNSPUNSPUNSPunknUNSPUNSPUNSP
201998-04-08 08:25PDTYesdtsUSGS0.065.28 GoodClearNONE1Imported Channel 1UNSPother 0.06 UNSPUNSPUNSPunknUNSPUNSPUNSP
191998-03-25 10:17PSTYesdtsUSGS0.515.550.000.20PoorClearNONE1Imported Channel 1WADEunspeunkno0.511.900.550.94UNSPUNSPUNSPunknUNSPUNSPUNSP
181998-03-18 16:05PSTYesdtsUSGS0.185.35 GoodClearNONE1Imported Channel 1UNSPother 0.18 UNSPUNSPUNSPunknUNSPUNSPUNSP
171998-02-02 12:25PSTYesdtsUSGS0.305.46 GoodClearNONE1Imported Channel 1UNSPother 0.30 UNSPUNSPUNSPunknUNSPUNSPUNSP
161998-01-14 08:05PSTYesdtsUSGS0.175.460.000.30PoorClearNONE1Imported Channel 1WADEunspeunkno0.171.800.400.42UNSPUNSPUNSPunknUNSPUNSPUNSP
151997-06-02 14:50PDTYesHBUSGS0.005.15 Fair NONE1Imported Channel 1UNSPother 0.00 UNSPUNSPUNSPunknUNSPUNSPUNSP
141997-04-28 14:55PDTYesdtsUSGS0.165.420.000.20PoorClearNONE1Imported Channel 1WADEunspeunkno0.161.100.250.64UNSPUNSPUNSPunknUNSPUNSPUNSP
131997-04-24 08:30PDTYesDTSUSGS0.135.420.000.10PoorClearNONE1Imported Channel 1WADEunspeunkno0.131.100.230.56UNSPUNSPUNSPunknUNSPUNSPUNSP
121997-04-23 10:24PDTYesDTSUSGS0.305.46 Poor NONE1Imported Channel 1UNSPother 0.30 UNSPUNSPUNSPunknUNSPUNSPUNSP
111997-03-18 07:12PSTYesDTSUSGS1.165.760.000.30PoorClearNONE1Imported Channel 1WADEunspeunkno1.162.901.061.10UNSPUNSPUNSPunknUNSPUNSPUNSP
101997-03-17 10:12PSTYesDTSUSGS1.635.860.000.30PoorClearNONE1Imported Channel 1WADEunspeunkno1.632.801.311.25UNSPUNSPUNSPunknUNSPUNSPUNSP
91997-03-09 07:01PSTYesDTSUSGS1.035.720.000.30PoorClearNONE1Imported Channel 1WADEunspeunkno1.032.500.961.07UNSPUNSPUNSPunknUNSPUNSPUNSP
81997-02-27 09:29PSTYesDTSUSGS2.065.920.000.30FairClearNONE1Imported Channel 1WADEunspeunkno2.063.101.681.22UNSPUNSPUNSPunknUNSPUNSPUNSP
71997-02-19 10:33PSTYesDTSUSGS4.766.161.000.50PoorClearNONE1Imported Channel 1WADEunspeunkno4.763.502.322.05UNSPUNSPUNSPunknUNSPUNSPUNSP
61997-01-28 07:37PSTYesDTSUSGS2.906.010.000.40PoorClearNONE1Imported Channel 1WADEunspeunkno2.903.001.881.54UNSPUNSPUNSPunknUNSPUNSPUNSP
51997-01-09 10:43PSTYesDTSUSGS7.976.350.000.40FairUnspecifedNONE1Imported Channel 1WADEunspeunkno7.974.403.102.57UNSPUNSPUNSPunknUNSPUNSPUNSP
41997-01-02 10:22PSTYesDTSUSGS5.666.240.000.40FairClearNONE1Imported Channel 1WADEunspeunkno5.664.702.971.90UNSPUNSPUNSPunknUNSPUNSPUNSP
31997-01-01 12:37PSTYesDTSUSGS9.126.420.000.40FairUnspecifedNONE1Imported Channel 1WADEunspeunkno9.124.903.542.57UNSPUNSPUNSPunknUNSPUNSPUNSP
21997-01-01 08:06PSTYesDTSUSGS10.56.46-0.020.20FairUnspecifedNONE1Imported Channel 1WADEunspeunkno10.55.303.872.72UNSPUNSPUNSPunknUNSPUNSPUNSP
11996-12-27 08:07PSTYesdtsUSGS0.07 PoorIceCoverNONE1Imported Channel 1WADEunspeunkno0.071.100.190.38UNSPUNSPUNSPunknUNSPUNSPUNSP