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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

3 data types available - data from 2004-10-01 to 2026-09-09

Daily data

1 data types available - data from 2004-06-24 to 2026-09-07

Field measurements

2 data types available - data from 2004-06-24 to 2026-07-16

Discrete sample data

0 observed properties (data types) available

Peak measurements

2 data types available - with data from 2004-08-18 to 2025-06-27

Statistical tables for select daily data types

1 data types available - data from 2004-06-24 to 2026-09-07

Important information about this monitoring location

LOCATION.-- On left bank 1.8 mi north of Germantown, and 1.6 mi west of Neelsville, on the northeastern edge of Little Seneca Regional Park. PERIOD OF RECORD.-- June 2004 to current year. GAGE.--Datum of gage is 424.55 ft above North American Vertical Datum of 1988. Prior to June 7, 2007, gage located 162 ft upstream, at gage datum 1.45 ft higher.

Location details and information

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Montgomery County

Metadata Element	Location Metadata	Metadata Code
Agency	U.S. Geological Survey	USGS
Location identification number	01644375	n/a
Location name	LITTLE SENECA CREEK TRIBUTARY NEAR GERMANTOWN, MD	n/a
Site type	Stream	ST
Decimal latitude (WGS84)	39.19938888888888	n/a
Decimal longitude (WGS84)	-77.27536111111111	n/a
Latitude-longitude method	Interpolated from Digital MAP.	N
Latitude-longitude accuracy	Accurate to + or - 1 sec.	S
District	Maryland	24
State	Maryland	24
County	Montgomery County	031
Country	United States of America	n/a
Altitude of gage/land surface	424.55 feet	n/a
Method altitude determined	GNSS3 - Level 3 Quality Survey Grade Global Navigation Satellite System	Y
Altitude accuracy	0.11 feet	n/a
Altitude datum	North American Vertical Datum of 1988	NAVD88
Subbasin hydrologic unit	Middle Potomac-Catoctin	02070008
Drainage basin		n/a
Date of first construction		n/a
Drainage area	1.35 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 Little Seneca Creek Tributary Near Germantown, MD - USGS-01644375