USGS Water-Year Summary 2020
01581920 GUNPOWDER FALLS NEAR PARKTON, MD
LOCATION - Lat 39°37'08.6", long 76°41'25.3" referenced to North American Datum of 1983, Baltimore County, MD, Hydrologic Unit 02060003, on left bank at downstream side of bridge on Falls Road, and 1.4 mi downstream from Prettyboy Reservoir.
DRAINAGE AREA - 81.5 mi².
- WDR-US-2007: 2004, 2006 (M).
PERIOD OF RECORD - July 2000 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 355.43 ft above North American Vertical Datum of 1988. November 1982 to November 1990, nonrecording gage 100 ft downstream.
PERIOD OF DAILY RECORD - WATER TEMPERATURE: March 2011 to current year.
INSTRUMENTATION - Water-temperature sensor, March 2011 to current year.
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 25.0°C, multiple occurrences recorded, first occurrence on August 04, 2018; minimum, 0.1°C, February 21, 2015.