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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
Biological Water-quality 1985-09-04 1997-09-15
Information Water-quality 1981-10-15 2004-08-04
Inorganics, Major, Metals Water-quality 1988-12-20 1995-08-14
Inorganics, Major, Non-metals Water-quality 1985-09-04 2004-08-04
Inorganics, Minor, metals Water-quality 1988-12-20 1995-08-14
Microbiological Water-quality 1986-01-06 1989-12-11
Nutrient Water-quality 1985-09-04 2001-09-26
Organics, PCBs Water-quality 1989-09-11 1989-09-11
Organics, other Water-quality 1985-09-04 2001-09-26
Organics, pesticide Water-quality 1989-09-11 1989-09-11
Physical Daily Values, Unit Values, Water-quality 1944-07-20 2024-11-21
Sediment Water-quality 1985-10-07 2001-09-26
n/a Peak Measurements 1945-08-01 2022-05-23
n/a Site Visits 1944-07-12 2024-09-11
n/a USGS Annual Water Data Reports Site 2006-01-01 2022-01-01
Water Data for the Nation inventory

Monitoring location 01591000 is associated with a Stream in Montgomery County, Maryland. Current conditions of Discharge and Gage height are available. Water data back to 1944 are available online.

Metadata Element Location Metadata Metadata Code
Agency
U.S. Geological Survey USGS
Site identification number
01591000 n/a
Site name
PATUXENT RIVER NEAR UNITY, MD n/a
Site type
Stream
ST
DMS latitude 391417.7 n/a
DMS longitude 0770320.6 n/a
Decimal latitude 39.23825 n/a
Decimal longitude -77.0557222 n/a
Latitude-longitude method
Interpolated from MAP. M
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 n/a
Scale of location map n/a
Altitude of Gage/land surface 364.04 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
Patuxent 02060006
Drainage basin
n/a
Topographic setting
n/a
Flags for instruments at site YNYNNNYNNNYNNNNNNNNNNNNNNNNNNN n/a
Date of first construction
n/a
Date site established or inventoried n/a
Drainage area
34.8 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 442408000 n/a

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logo for Maryland Department of Natural Resources, Maryland Geological Survey
Maryland Department of Natural Resources, Maryland Geological Survey
logo for USGS - Cooperative Matching Funds
USGS - Cooperative Matching Funds