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
Shands Bridge Spring lies under this section of the St. Johns River.

Shands Bridge Spring lies under this section
of the St. Johns River.

Shands Bridge Spring

St. Johns County

Description

Shands Bridge Spring is a submerged third-magnitude spring. The St. Johns River is about 17 to 20 feet deep near the spring. An almost circular depression (recorded by Fathometer) was observed in the bottom of the river at the spring (Spechler 1996). Groundwater is discharged from a vent at the deepest point in the spring, about 30 feet below the surface.

Discharge

No actual discharge measurements have been done at Shands Bridge Spring. Discharge was estimated at 1 cubic foot per second (cfs) in 1995 (Spechler 1996).

Water quality

Shands Bridge Spring was sampled by St. Johns River Water Management District in 1994 and 2007. The water quality data for selected variables are shown in the table below.

Summary statistics of water quality data at Shands Bridge Spring

Shands Bridge Spring Min Mean Median Max Count Period
Alkalinity, total, mg/L as CaCO3 99.1 99.1 99.1 99.1 1 2007
Calcium, total, mg/L as Ca 92.0 92.0 92.0 92.0 1 2007
Chloride, total, mg/L as Cl 12.0 12.4 12.4 12.7 2 1994−2007
Fluoride, total, mg/L as F 0.52 0.52 0.52 0.52 1 2007
Magnesium, total, mg/L as Mg 42.0 42.0 42.0 42.0 1 2007
pH, field 7.58 7.58 7.58 7.58 1 1994
Potassium, total, mg/L as K 2.6 2.6 2.6 2.6 1 2007
Sodium, total, mg/L as Na 10.0 10.0 10.0 10.0 1 2007
Specific conductance, field, µmhos/cm at 25°C 826 886 886 945 2 1994−2007
Specific conductance, lab, µmhos/cm at 25°C 810 810 810 810 1 2007
Sulfate, total, mg/L as SO4 337.0 338.5 338.5 340.0 2 1994−2007
Total dissolved solids, mg/L 595 595 595 595 1 2007
Water temperature, °C 25.1 26.1 26.1 27.0 2 1994−2007
Units: µmhos/cm = micromhos per centimeter
         mg/L = milligrams per liter
         cfs = cubic feet per second

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