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Important for you to know:

  • New to WDFN: see current water conditions throughout the state using the new State Pages. Filter by continuous data type and age of data, view latest values, and link to graphing options to explore the data further. To learn more, read our announcement on the Water Data for the Nation blog.
Important Legacy real-time page

USGS Parameter Group Data Types Start Date End Date
Information Water-quality 1980-09-17 2022-10-19
Inorganics, Major, Metals Water-quality 1965-08-09 1983-02-09
Inorganics, Major, Non-metals Daily Values, Unit Values, Water-quality 1965-08-09 2024-11-28
Microbiological Water-quality 1969-07-16 1983-04-20
Nutrient Daily Values, Unit Values, Water-quality 1965-08-09 2024-11-28
Organics, PCBs Water-quality 1980-09-17 1980-09-17
Organics, other Water-quality 1980-09-17 2015-10-07
Organics, pesticide Water-quality 1980-09-17 1983-04-20
Physical Daily Values, Unit Values, Water-quality 1930-03-01 2024-11-28
Sediment Water-quality 1975-09-27 2015-10-07
n/a Peak Measurements 1931-04-03 2022-12-24
n/a Site Visits 1930-03-25 2024-10-15
n/a USGS Annual Water Data Reports Site 2006-01-01 2023-01-01
Water Data for the Nation inventory

Monitoring location 01646500 is associated with a Stream in Montgomery County, Maryland. Current conditions of Discharge, Dissolved oxygen, Gage height, and more are available. Water data back to 1930 are available online.

Metadata Element Location Metadata Metadata Code
Agency
U.S. Geological Survey USGS
Site identification number
01646500 n/a
Site name
POTOMAC RIVER NEAR WASH, DC LITTLE FALLS PUMP STA n/a
Site type
Stream
ST
DMS latitude 385659.2 n/a
DMS longitude 0770739.5 n/a
Decimal latitude 38.94977778 n/a
Decimal longitude -77.12763889 n/a
Latitude-longitude method
Mapping grade GPS unit (handheld accuracy range 12 to 40 ft) G
Latitude-longitude accuracy
Accurate to + or - 1 sec. S
Latitude-longitude datum
North American Datum of 1983 NAD83
Decimal Latitude-longitude datum North American Datum of 1983 NAD83
District
Maryland 24
State
Maryland 24
County
Montgomery County 031
Country US n/a
Land net location description n/a
Name of location map FALLS CHURCH, VA n/a
Scale of location map 24000 n/a
Altitude of Gage/land surface 37.20 feet n/a
Method altitude determined Interpolated from Digital Elevation Model N
Altitude accuracy .1 feet n/a
Altitude datum
North American Vertical Datum of 1988 NAVD88
Subbasin hydrologic unit
Middle Potomac-Catoctin 02070008
Drainage basin
n/a
Topographic setting
n/a
Flags for instruments at site YNNNYNYNNYNNNNNNNNNNNNNNNNNNNN n/a
Date of first construction
n/a
Date site established or inventoried n/a
Drainage area
11560 square miles n/a
Contributing drainage area n/a
Time Zone abbreviation EST n/a
Site honors Daylight Saving Time
Y n/a
Data reliability
n/a
Data-other GW files NNNNNNNN 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
Project number 442400100 n/a

Operated in cooperation with:

logo for USGS - Federal Priority Streamgages
USGS - Federal Priority Streamgages