USGS Water-Year Summary 2021
03216600 OHIO RIVER AT GREENUP DAM, KY
LOCATION - Lat 38°38'48", long 82°51'38" referenced to North American Datum of 1927, Greenup County, KY, Hydrologic Unit 05090103, on Ohio River, at left bank at downstream end of lock guidewall in lower pool at Greenup Locks, 1.1 miles upstream from Grays Branch, 4.7 miles downstream from Little Sandy River, 5.0 miles north of Greenup, and at mile 341.5.
DRAINAGE AREA - 62,000 mi².
PERIOD OF RECORD - October 1968 to current year.
GAGE - Records of Greenup Dam operations and hydropower releases furnished by the U.S. Army Corps of Engineers are used to determine daily discharge. Water-stage recorder with telemetry in Greenup Dam tailwater for peak stage determination. Datum of gage is 472.43 feet above NGVD of 1929 or 472.97 feet Ohio River Datum. Auxiliary water-stage recorder is located at the waste water treatment plant in Portsmouth, Ohio, 14.1 miles downstream, established October 1, 1981 and used in slope rating computation from October 1, 1981 to September 30, 1983. Datum of gage is 470.43 feet above NGVD of 1929 or 470.99 feet Ohio River Datum. Record of Greenup Dam headwater, tailwater, gate openings and lockages used to determine discharge from October 1, 1968 to September 30, 1981. Slope rating computation from October 1, 1981 to September 30, 1983, and Branch Flow Model, gate and tailwater rating from October 1, 1983 to current year.
COOPERATION - U.S. Army Corps of Engineers, Huntington, WV District.
EXTREMES FOR PERIOD OF RECORD - Maximum gage height 56.76' on March 13, 2011; maximum discharge 520000 ft³/s on March 4, 1997. Lowest mean daily discharge 2720 ft³/s on October 7, 2007.
PERIOD OF RECORD - Water years 1974 to September 1986, 1997 to current water year.
PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE:October 1974 to September 1981.
WATER TEMPERATURES:October 1974 to September 1981.