USGS Water-Year Summary 2019
02245340 ST JOHNS R BLW SHANDS BRIDGE NR GRN COVE SPRG, FL
LOCATION - Lat 30°00'21.32", long 81°36'54.49" referenced to North American Datum of 1983, St. Johns County, FL, Hydrologic Unit 03080103, 10000 Shands Pier Road, on left side of fishing pier at the end of Shands Pier, on the right bank of the St. Johns river, 4 mi east-northeast of Green Cove Springs, 1 mi downstream of Shands Bridge, and 49 mi upstream of mouth.
DRAINAGE AREA -
PERIOD OF RECORD - June 2017 to current year.
GAGE - Water-stage recorder and data-collection platform. Datum of gage is at NAVD of 1988.
COOPERATION - This gage is monitored in cooperation with the U.S. Army Corps of Engineers.
EXTREMES FOR PERIOD OF RECORD - Maximum gage height, 5.02 ft, Sept. 11, 2017; minimum, -1.20 ft, April 17 and 19, 2018.
PERIOD OF RECORD
SPECIFIC CONDUCTANCE: June 2017 to current year.
SALINITY: June 2017 to current year.
WATER TEMPERATURE: June 2017 to current year.
INSTRUMENTATION - Water-quality monitor and data-collection platform.
EXTREMES FOR PERIOD OF RECORD
SPECIFIC CONDUCTANCE: Maximum, 9,350 µS/cm @ 25°C, June 10, 2017; minimum, 371 µS/cm @ 25°C, Feb. 15, 2019.
SALINITY: Maximum, 5.2 ppt, June 9 and 10, 2017; minimum, 0.2 ppt, many days.
WATER TEMPERATURE: Maximum, 34.2°C, July 6, 2017; minimum, 8.5°C, Jan. 5, 2018.