USGS Water-Year Summary 2023
02301000 NORTH PRONG ALAFIA RIVER AT KEYSVILLE, FL
LOCATION - Lat 27°53'01", long 82°06'01" referenced to North American Datum of 1927, in SW 1/4 sec.10, T.30 S., R.22 E., Hillsborough County, FL, Hydrologic Unit 03100204, near left bank on upstream side of highway bridge, 0.6 mi north of Keysville, 4.0 mi upstream from confluence with South Prong Alafia River, and 29 mi upstream from mouth of Alafia River at Hillsborough Bay.
DRAINAGE AREA - 135 mi².
REVISIONS HISTORY - WSP 1905: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - May 1950 to September 1992; October 1992 to September 1995 (discharge measurements only); October 1995 to current year. Monthly discharge only from May 1950, published in WSP 1304.
GAGE - Water-stage recorder. Datum of gage is 38.56 ft above National Geodetic Vertical Datum of 1929 and 37.59 ft. above North American Vertical Datum of 1988. Prior to May 8, 1974, at same site at same datum; May 8, 1974, to July 13, 1995, at site 300 ft downstream at same datum.
COOPERATION - This gage is monitored in cooperation with Southwest Florida Water Management District.
WATER-QUALITY RECORDS
PERIOD OF RECORD - Water years 1965 to September 2011 (discontinued).