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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

4 data types available - data from 2022-07-19 to 2026-02-12

Daily data

2 data types available - data from 2022-07-20 to 2025-11-16

Field measurements

2 data types available - data from 2022-07-19 to 2026-03-19

Discrete sample data

204 Observed properties (data types) available - with data from 2007-06-27 to 2023-08-08

9 Sampling activities

Peak measurements

2 data types available - with data from 2023-07-29 to 2025-07-19

Statistical tables for select daily data types

2 data types available - data from 2022-07-20 to 2025-11-16

Important information about this monitoring location

LOCATION.-- On right bank, 250 ft upstream from Joyce Road bridge in Rock Creek Park in Washington, DC, and 450 ft upstream from mouth. PERIOD OF RECORD.-- July 2022 to August 2022 (gage height only). August 2022 to November 2025 (gage height and discharge). November 2025 to March 2026 (gage height only; discontinued). GAGE.-- Water stage recorder. Datum of gage is 140.52 ft above North American Vertical Datum of 1988. PERIOD OF RECORD (WQ).-- WATER TEMPERATURE: July 2022 to November 2025.

Location details and information

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Metadata Element	Location Metadata	Metadata Code
Agency	U.S. Geological Survey	USGS
Location identification number	01648011	n/a
Location name	Luzon Branch above Rock Creek at Washington DC	n/a
Site type	Stream	ST
Decimal latitude (WGS84)	38.96169444444445	n/a
Decimal longitude (WGS84)	-77.04138888888889	n/a
Latitude-longitude method	Interpolated from digital map	N
Latitude-longitude accuracy	Accurate to + or - .1 sec (Differentially-Corrected GPS).	1
District	Maryland	24
State	District of Columbia	11
County	District of Columbia	001
Country	United States of America	n/a
Altitude of gage/land surface	140.52 feet	n/a
Method altitude determined	GNSS2 - Level 2 Quality Survey Grade Global Navigation Satellite System	X
Altitude accuracy	0.14 feet	n/a
Altitude datum	North American Vertical Datum of 1988	NAVD88
Subbasin hydrologic unit	Middle Potomac-Anacostia-Occoquan	02070010
Drainage basin		n/a
Date of first construction		n/a
Drainage area	1.03 square miles	n/a
Contributing drainage area		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 Luzon Branch above Rock Creek at Washington DC - USGS-01648011