USGS Water-Year Summary for Site 02239501

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	00065 Gage height(Mean)
	00095 Specific cond at 25C(Max.,Mean,Min.)
	00300 Dissolved oxygen(Min.,Max.,Mean)
	00400 pH(Min.,Max.,Med.)
	63160 Stream level, NAVD88(Mean)
	99133 NO3+NO2,water,insitu(Max.,Min.,Mean)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

02239501 SILVER RIVER NEAR OCALA, FL

LOCATION - Lat 29°12'53", long 82°02'29" referenced to North American Datum of 1927, in SE 1/4 sec.06, T.15 S., R.23 E., Marion County, FL, Hydrologic Unit 03080102, on south right bank 50 ft below excavated pool (Lost River Outpost), 800 ft downstream from Paradise Park, 3,900 ft downstream from head of Silver Springs, 4.0 mi upstream from mouth, and 6.2 mi northeast of Ocala.

DRAINAGE AREA - Indeterminate (Springs basin).

REVISIONS HISTORY -

WDR US-07-1A: 2002-2005. WDR-US-2011: 2007-2009, Discharge.

A mean daily pH was reported from Sept. 23, 2020 to Dec. 13, 2023. This issue was discovered on July 17, 2024 and mean pH data were removed from publication and a median daily value was reported in its place.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1932 to current year. Discharges for the period October 1932 to September 2005, published as station 02239500 Silver Springs near Ocala, have been moved to this station number which is at the location where the majority of discharge measurements were made to define the discharge relationship with (291115081592501) Sharpes Ferry Well, Marion 5 nr Ocala through September 2002 and CE-76 Well from October 2002 to current year. Gage height record for periods February 1967 to June 1972 and November 2003 to current year.

GAGE - Water-stage recorder and data-collection platform. Datum of gage is 38.21 ft above NGVD of 1929 (levels by St. Johns River Water Management District) and 37.36 ft above NAVD of 1988. Gage height record for February 1967 to June 1972 is at NGVD of 1929 datum. Groundwater elevations for artesian pressure are collected at the CE-76 Well and published under station number 291100082010003.

COOPERATION - This gage is monitored in cooperation with the St. Johns River Water Management District.

REMARKS - Discharge computed from relation between artesian pressure at CE-76 Well (291100082010003) and Silver Springs pool elevation (02239500) and discharge measurements made at gage location. The Sharpes Ferry well, Marion 5 nr Ocala, FL (291115081592501) was used for artesian pressure until August 2002. Groundwater elevations for artesian pressure are collected at the CE-76 Well and published under station number 291100082010003.

WATER-QUALITY RECORDS

PERIOD OF RECORD -

SPECIFIC CONDUCTANCE: September 2020 to current year.

WATER TEMPERATURE: September 2020 to current year.

DISSOLVED OXYGEN: September 2020 to current year.

PH: September 2020 to current year.

NITRATE: September 2020 to current year.

INSTRUMENTATION - Water-quality monitor and data-collection platform.

REMARKS - Extremes for current year and extremes for period of daily record are based on recorded values and may have been exceeded during periods of no record.

EXTREMES FOR PERIOD OF RECORD -

SPECIFIC CONDUCTANCE: Maximum, 511 µS/cm @ 25 °C, Sept 2, 4-7, 2022; minimum, 424 µS/cm @ 25 °C, Mar. 30, 2021.

WATER TEMPERATURE: Maximum, 25.8 °C, June 8, 2021, May 16, 2023; minimum, 21.0 °C, Feb. 2, 2021.

DISSOLVED OXYGEN: Maximum, 9.0 mg/L, May 8, 9, 2023; minimum, 1.9 mg/L, several days.

pH: Maximum, 7.8 std. units, several days; minimum, 7.1 std, many days.

NITRATE: Maximum, 1.26 mg/L, Dec. 25, 2022; minimum, 0.99 mg/L, June 3, 2021, May 22, 2023.