USGS Water-Year Summary 2019
01591000 PATUXENT RIVER NEAR UNITY, MD
LOCATION - Lat 39°14'17.7", long 77°03'20.6" referenced to North American Datum of 1983, Montgomery County, MD, Hydrologic Unit 02060006, on right bank at downstream side of bridge on State Highway 97, 0.6 mi upstream from Cattail Creek, 0.8 mi upstream from Triadelphia Reservoir, 1.1 mi northeast of Unity, and 97 mi upstream from mouth.
DRAINAGE AREA - 34.8 mi².
- WSP 1111: 1947. WSP 1432: 1948. https://waterdata.usgs.gov/nwis/dv/?site_no=01591000: 2013.
PERIOD OF RECORD - July 1944 to current year.
GAGE - Water stage recorder, crest-stage gage and concrete control. Datum of gage is 364.04 ft above North American Vertical Datum of 1988. Prior to Aug. 14, 1946, non-recording gage at same site and gage datum.