USGS Water-Year Summary 2020
02087182 FALLS LAKE ABOVE DAM NEAR FALLS, NC
LOCATION - Lat 35°56'28", long 78°35'00" referenced to North American Datum of 1983, Wake County, NC, Hydrologic Unit 03020201, on intake tower 50 ft upstream from Falls Lake dam, and 0.3 mi northwest of Falls and 235 mi upstream from mouth.
DRAINAGE AREA - 771 mi².
PERIOD OF RECORD - February 1979 to current year.
GAGE - Water-stage recorder. Datum of gage is National Geodetic Vertical Datum of 1929. U.S. Army Corps of Engineers satellite telemetry at streamgage.
COOPERATION - Gage is operated in cooperation with the U.S. Army Corps of Engineers.
EXTREMES FOR PERIOD OF RECORD - Maximum elevation, 264.34 ft, October 1, 2, 1999; minimum elevation, 241.52 ft, December 26, 2007.
PERIOD OF RECORD - October 1998 to current year.
INSTRUMENTATION - Data collection platform (DCP) and heated tipping bucket rain gage collecting data at a 15-minute interval. The DCP is housed in a 6 ft by 6 ft walk-in shelter located on the intake tower 300 ft upstream from the dam. The shelter has reinforced concrete walls, a steel access door, and is maintained by the COE. The heated tipping bucket rain gage is located on the intake tower 20 ft from the walk-in shelter.
PERIOD OF RECORD - WATER TEMPERATURE: September 2009 to current year.
PERIOD OF DAILY RECORD - WATER TEMPERATURE: September 2009 to current year.
INSTRUMENTATION - Design Analysis Associates (DAA) model H-522 data collection platform (DCP) and DAA temperature sensor. Thermometer probe suspended 1.5 feet below the water surface attached to a float on a pulley system that allows the probe to fluctuate with water levels. The assembly is mounted on the north east side of the water intake towers at the dam. Since 2009.
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE:For current configuration of temperature probe and location from September 3, 2009 to September 30, 2016 Maximum recorded, 35.1°C, June 15, 2010 and July 24, 2016; minimum recorded, 2.0°C, January 10, 2010.