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Scheduled Maintenance Notice
USGS will be performing maintenance on the time series data processing system beginning at 09:00 EDT on September 10, 2026. During this period, delivery of the latest time series data will be delayed. The maintenance is expected to finish within 2 hours, after which all backlogged time series data will be processed and delivered to WDFN web portals and APIs.

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Available data

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Continuous data

15 data types available - data from 2007-10-01 to 2026-09-09

Daily data

5 data types available - data from 1961-12-21 to 2026-09-08

Field measurements

0 data types available

Discrete sample data

92 Observed properties (data types) available - with data from 1966-12-12 to 2026-07-22

782 Sampling activities

Peak measurements

1 data types available - with data from 1972-12-22 to 1992-12-11

Statistical tables for select daily data types

5 data types available - data from 1964-10-01 to 2026-09-08

Important information about this monitoring location

Prior to April 1981 sampling site located at auxiliary tidal-gaging station at the end of Reynolds Aluminum Company pier, 0.5 mi downstream from Chester Creek in Chester (latitude 39.836738, longitude -75.366638); prior to April 2016, located at pumphouse on Kimberly Clark property, 400 ft upstream from Chester Creek. Data collection discontinued during winter months. Other interruptions in the record were due to malfunctions of the instrumentation.

Location details and information

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Operated in cooperation with:

Delaware River Basin Commission

USGS - Cooperative Matching Funds

Metadata Element	Location Metadata	Metadata Code
Agency	U.S. Geological Survey	USGS
Location identification number	01477050	n/a
Location name	DELAWARE RIVER AT CHESTER PA	n/a
Site type	Stream	ST
Decimal latitude (WGS84)	39.8367793444114	n/a
Decimal longitude (WGS84)	-75.3663019855329	n/a
Latitude-longitude method	Interpolated from MAP.	M
Latitude-longitude accuracy	Accurate to + or - 1 sec.	S
District	Pennsylvania	42
State	Pennsylvania	42
County	Delaware County	045
Country	United States of America	n/a
Altitude of gage/land surface	0	n/a
Method altitude determined	Level or other surveyed method.	L
Altitude accuracy	0.01 feet	n/a
Altitude datum	National Geodetic Vertical Datum of 1929	NGVD29
Subbasin hydrologic unit	Lower Delaware	02040202
Drainage basin		n/a
Date of first construction		n/a
Drainage area	10300 square miles	n/a
Contributing drainage area	10300 square miles	n/a
Time zone abbreviation	EST	n/a
Site honors Daylight Saving Time	Y	n/a
National aquifer		n/a
Local aquifer		n/a
Local aquifer type		n/a
Well depth		n/a
Hole depth		n/a
Source of depth data		n/a

Monitoring location Delaware River at Chester PA - USGS-01477050