USGS Water-Year Summary 2021
02301718 ALAFIA RIVER AT US 301 AT RIVERVIEW, FL.
LOCATION - Lat 27°52'09.63", long 82°19'35.23" referenced to North American Datum of 1983, in NE 1/4 NE 1/4 SE 1/4 sec.17, T.30 S., R.20 E., Hillsborough County, FL, Hydrologic Unit 03100204, on upstream side of US Highway 301 Bridge near right bank in Riverview
DRAINAGE AREA - 414 mi².
PERIOD OF RECORD - May 1999 to September 2003 (maximum and minimum gage heights only); October 2003 to September 2010 (tidal high-high and low-low gage heights only); October 2010 to March 2015 (maximum and minimum gage heights only), March 2015 to current year.
GAGE - Water-stage recorder. Datum of gage is National Geodetic Vertical Datum of 1929. Prior to June 10, 2021, gage located on right bank private dock approximately 0.4 mi upstream, at current datum.
COOPERATION - This gage is monitored in cooperation with Southwest Florida Water Management District and Hillsborough County.
EXTREMES FOR PERIOD OF RECORD - Maximum gage height, 6.20 ft, Sep. 6, 2004; minimum, 2.98 ft below NGVD 29, Jan. 3, 2008.
PERIOD OF RECORD - March 2016 to current year.
INSTRUMENTATION - An 8-inch diameter, tipping bucket precipitation gage 15-minute interval, mounted on an aluminum pipe with the top of the funnel 6 ft above the dock.
PERIOD OF RECORD - May 1999 to current year.
COOPERATION - This gage is monitored in cooperation with Tampa Bay Water.
INSTRUMENTATION - Water-quality monitor consisting of specific conductance and temperature sensors located near the top and near the bottom. The top sensor is at an elevation of 2.6 ft, below NGVD and the bottom sensor is at a an elevation of 4.8 ft. below NGVD.
EXTREMES FOR PERIOD OF RECORD - SPECIFIC CONDUCTANCE: Top sensor maximum, 41,700 microsiemens, May 11, 2001; bottom sensor maximum, 43,300 microsiemens, Nov. 7, 2008; top sensor minimum, 79 microsiemens, Jan. 1, 2003; bottom sensor minimum, 80 microsiemens, Sept. 7, 2004.
TEMPERATURE: Top sensor maximum, 33.1°C, June 21, 2011; bottom sensor maximum, 32.7°C, June 15, 2001; top sensor minimum, 8.9°C, Jan. 13, 2010; bottom sensor minimum, 8.8°C, Jan. 13, 2010.