St. Johns River Water Management District St. Johns River Water Management District St. Johns River Water Management District St. Johns River Water Management District St. Johns River Water Management District St. Johns River Water Management District
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Water bodies, watersheds and storm water
Sharks Tooth Spring main view

Sharks Tooth Spring main view

A view of Sharks Tooth Spring run

A view of Sharks Tooth Spring run

Sharks Tooth Spring

Lake County

Description

Sharks Tooth Spring is a fifth-magnitude spring that emerges from the weathered limestone and clay at the base of a hillside. There is no pool at the spring head. The spring run is about 2 feet wide and flows about 800 feet toward the northeast to Sulphur Run. Camping, hiking, and equestrian trails are nearby within the Seminole State Forest.

Discharge

Discharge at Sharks Tooth Spring was measured by the U.S. Geological Survey (USGS) in 1997 and 2001 and by St. Johns River Water Management District in 2005 and 2008. The mean discharge was 0.18 cubic feet per second.

Water quality

Sharks Tooth Spring was sampled by USGS in 1997 and 1999, twice by Lake County in 2004, and by the district in 2005 and 2008. A summary of the water quality data for selected variables is shown in the table below.

Summary statistics of water quality and discharge at Sharks Tooth Spring

Sharks Tooth Spring Min Mean Median Max Count Period
Discharge, cfs 0.10 0.18 0.18 0.28 6 1997−2008
Alkalinity, total, mg/L as CaCO3 105.0 107.3 106.7 110.0 5 2004−2005
Calcium, total, mg/L as Ca 54.4 56.5 56.5 60.5 5 2004−2005
Chloride, total, mg/L as Cl 79.9 95.1 91.3 110.0 6 1997−2005
Dissolved Oxygen 1.50 1.55 1.55 1.60 2 2004
Magnesium, total, mg/L as Mg 15.1 17.1 16.4 20.8 5 2004−2005
Nitrate + nitrite, total, mg/L as N 0.01 0.15 0.14 0.32 5 2004−2005
Orthophosphate, total, mg/L as P 0.03 0.04 0.05 0.06 3 2005
pH, field 7.11 7.50 7.56 7.90 7 1997−2005
Phosphorus, total, mg/L as P 0.05 0.06 0.06 0.07 4 1999−2005
Potassium, total, mg/L as K 1.4 1.9 2.0 2.5 5 2004−2005
Sodium, total, mg/L as Na 46.9 50.0 50.6 51.9 5 2004−2005
Specific conductance, field, µmhos/cm at 25°C 677 689 680 710 5 2004−2005
Specific conductance, lab, µmhos/cm at 25°C 612 700 657 817 5 1997−2005
Sulfate, total, mg/L as SO4 82.3 111.8 93.7 200.0 5 1997−2005
Total dissolved solids, mg/L 349 396 396 430 6 1997−2005
Water temperature, °C 22.2 22.8 22.7 23.6 7 1997−2005
Units: µmhos/cm = micromhos per centimeter
         mg/L = milligrams per liter
         cfs = cubic feet per second

Age of discharge water

The age of water discharging from Sharks Tooth Spring was determined by measuring the concentration of tritium, carbon-14, and carbon-13 in the spring discharge, which was measured in March 2005. Sharks Tooth Spring had a tritium concentration of 1.43 tritium units, a carbon-14 concentration of 34 percent modern carbon, and a delta carbon-13 value of −10.14 parts per thousand. The tritium concentration suggests that the water is less than 50 years old. The carbon-14 concentration of 34% modern carbon can result from the reaction of rainfall with calcite, dolomite, and soil organic matter, and the mixing with Lower Floridan water.

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St. Johns River Water Management District
4049 Reid Street, Palatka, FL 32177
(800) 725-5922