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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 1959-03-03 1992-04-23
Inorganics, Major, Metals Water-quality 1961-06-09 1982-04-19
Inorganics, Major, Non-metals Daily Values, Unit Values, Water-quality 1961-06-09 2024-11-24
Inorganics, Minor, Non-metals Water-quality 1972-05-17 1976-08-31
Inorganics, Minor, metals Water-quality 1961-06-09 1982-04-19
Microbiological Water-quality 1976-08-31 1976-08-31
Nutrient Water-quality 1961-06-09 1982-04-19
Organics, PCBs Water-quality 1972-05-17 1976-08-31
Organics, other Water-quality 1976-08-31 1976-08-31
Organics, pesticide Water-quality 1972-05-17 1976-08-31
Physical Daily Values, Unit Values, Water-quality 1895-02-01 2024-11-24
Radiochemistry Water-quality 1961-11-03 1984-09-01
Sediment Daily Values, Water-quality 1959-03-03 1993-04-18
n/a Peak Measurements 1889-06-02 2023-03-05
n/a Site Visits 1895-03-25 2024-10-21
n/a USGS Annual Water Data Reports Site 2006-01-01 2023-01-01
Water Data for the Nation inventory

Monitoring location 01638500 is associated with a Stream in Frederick County, Maryland. Current conditions of Discharge, Dissolved oxygen, Gage height, and more are available. Water data back to 1889 are available online.

Metadata Element Location Metadata Metadata Code
Agency
U.S. Geological Survey USGS
Site identification number
01638500 n/a
Site name
POTOMAC RIVER AT POINT OF ROCKS, MD n/a
Site type
Stream
ST
DMS latitude 391624.9 n/a
DMS longitude 0773235.2 n/a
Decimal latitude 39.2735833 n/a
Decimal longitude -77.5431111 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
Frederick County 021
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 199.92 feet n/a
Method altitude determined Level or other surveyed method. L
Altitude accuracy .01 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 YYYNYNYNNNYNNNNNNNNNNNNNNNNNNN n/a
Date of first construction
n/a
Date site established or inventoried n/a
Drainage area
9651 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 Interstate Commission on the Potomac River Basin
Interstate Commission on the Potomac River Basin
logo for USGS - Federal Priority Streamgages
USGS - Federal Priority Streamgages