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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 01480877 Unn Trib to Valley Cr at Chester Cnty Library
Chester County, Pennsylvania
Hydrologic Unit Code 02040205
Latitude  40°01'51", Longitude  75°37'15" NAD27
Drainage area 1.34  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)
111991-07-11 12:00EDTYesagr/lasUSGS0.34 FairDebrisLightNONE1Imported Channel 1WADEunspeunkno0.344.200.640.53UNSPUNSPUNSPunknUNSPUNSPUNSP
101991-06-05 11:25EDTYesagr/cjrUSGS0.64 FairDebrisLightNONE1Imported Channel 1WADEunspeunkno0.644.501.080.59UNSPUNSPUNSPunknUNSPUNSPUNSP
91991-05-08 11:55EDTYesagr/cjrUSGS1.42 FairDebrisLightNONE1Imported Channel 1WADEunspeunkno1.426.001.480.96UNSPUNSPUNSPunknUNSPUNSPUNSP
81991-04-02 09:00ESTYesagr/cjrUSGS1.70 GoodDebrisLightNONE1Imported Channel 1WADEunspeunkno1.706.801.701.00UNSPUNSPUNSPunknUNSPUNSPUNSP
71991-03-20 09:20ESTYesagr/cjrUSGS1.43 FairDebrisLightNONE1Imported Channel 1WADEunspeunkno1.434.001.520.94UNSPUNSPUNSPunknUNSPUNSPUNSP
61991-03-09 10:45ESTYesagrUSGS0.94 FairDebrisLightNONE1Imported Channel 1WADEunspeunkno0.943.901.300.72UNSPUNSPUNSPunknUNSPUNSPUNSP
51991-01-23 13:20ESTYesagr/cjrUSGS1.60 FairDebrisLightNONE1Imported Channel 1WADEunspeunkno1.604.001.401.10UNSPUNSPUNSPunknUNSPUNSPUNSP
41990-11-06 12:55ESTYesagr/cjrUSGS0.35 FairDebrisLightNONE1Imported Channel 1WADEunspeunkno0.353.600.980.36UNSPUNSPUNSPunknUNSPUNSPUNSP
31990-10-10 13:45EDTYesagr/cjrUSGS0.39 FairDebrisLightNONE1Imported Channel 1WADEunspeunkno0.394.400.950.41UNSPUNSPUNSPunknUNSPUNSPUNSP
21990-09-05 10:02EDTYeskewUSGS1.32 PoorClearNONE1Imported Channel 1WADEunspeunkno1.324.903.420.39UNSPUNSPUNSPunknUNSPUNSPUNSP
11990-08-16 15:30EDTYesagr/cjrUSGS0.77 GoodDebrisLightNONE1Imported Channel 1WADEunspeunkno0.774.001.100.70UNSPUNSPUNSPunknUNSPUNSPUNSP