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
Blackwater Springs main view

Blackwater Springs main view
photo by T. Roberts, FGS

Blackwater Springs

Lake County

Description

Blackwater Springs is a third-magnitude spring that is composed of seven pools filled with organic debris and white, sulfur-reducing bacteria. The main spring run flows about 250 feet toward the west to Black Water Creek. Swampy lowland forests surround the springs.

Discharge

Blackwater Springs pool and run

Blackwater Springs pool and run

Discharge from Blackwater Springs, measured by the U.S. Geological Survey (USGS) in 1981, was 1.4 cubic feet per second.

Water Quality

Blackwater Springs was sampled once by USGS in 1981 and once in 2004 by Lake County. Summary statistics of the water quality data for selected variables are shown in the table below.

Summary statistics of water quality and discharge at Blackwater Springs

Blackwater Springs Min Mean Median Max Count Period
Discharge, cfs 1.40 1.40 1.40 1.40 1 1981
Alkalinity, total, mg/L as CaCO3 82.6 82.6 82.6 82.6 1 2004
Calcium, total, mg/L as Ca 71.0 71.0 71.0 71.0 1 2004
Chloride, total, mg/L as Cl 9.4 10.1 10.1 10.7 2 1981−2004
Dissolved Oxygen 2.20 2.20 2.20 2.20 1 2004
Magnesium, total, mg/L as Mg 18.2 18.2 18.2 18.2 1 2004
pH, field 7.50 7.50 7.50 7.50 1 2004
Potassium, total, mg/L as K 1.0 1.0 1.0 1.0 1 2004
Sodium, total, mg/L as Na 5.2 5.2 5.2 5.2 1 2004
Specific conductance, field, µmhos/cm at 25°C 575 575 575 575 1 2004
Specific conductance, lab, µmhos/cm at 25°C 520 520 520 520 1 1981
Sulfate, total, mg/L as SO4 161.8 165.9 165.9 170.0 2 1981−2004
Total dissolved solids, mg/L 371 396 396 421 2 1981−2004
Water temperature, °C 24.0 24.4 24.4 24.8 2 1981−2004
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