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
Blue Spring main view

Blue Spring main view

Blue Spring

Marion County

Description

Blue Spring is a third-magnitude spring located along the south bank of the Ocklawaha River. The spring is presently submerged by the Rodman Reservoir. A large outline of the spring boil is visible on the reservoir’s surface.

Discharge

Discharge from Blue Spring was measured by the U.S. Geological Survey at 10.6 cubic feet per second (cfs) in October 1935 and at 0.5 cfs in May 1999. St. Johns River Water Management District measured discharge twice in 2008. The mean discharge is 15.78 cfs (see the table below).

Water quality

The district sampled Blue Spring for water quality in 2008 (see the table below).

Summary statistics of water quality and discharge at Blue Spring

Blue Spring — Marion County Min Mean Median Max Count Period
Discharge, cfs 0.5 15.78 15.30 27.50 4 1935−2008
Alkalinity, total, mg/L as CaCO3 49.6 49.6 49.6 49.6 1 2008
Calcium, total, mg/L as Ca 66.0 66.0 66.0 66.0 1 2008
Chloride, total, mg/L as Cl 509.0 509.0 509.0 509.0 1 2008
Magnesium, total, mg/L as Mg 29.0 29.0 29.0 29.0 1 2008
Nitrate + nitrite, total, mg/L as N 0.09 0.09 0.09 0.09 1 2008
Orthophosphate, total, mg/L as P 0.01 0.01 0.01 0.01 1 2008
Phosphorus, total, mg/L as P 0.02 0.02 0.02 0.02 1 2008
Potassium, total, mg/L as K 6.4 6.4 6.4 6.4 1 2008
Sodium, total, mg/L as Na 277.0 277.0 277.0 277.0 1 2008
Specific conductance, field, µmhos/cm at 25°C 1937 1937 1937 1937 1 2008
Specific conductance, lab, µmhos/cm at 25°C 1170 1170 1170 1170 1 2008
Sulfate, total, mg/L as SO4 119.0 119.0 119.0 119.0 1 2008
Total dissolved solids, mg/L 1080 1080 1080 1080 1 2008
Water temperature, °C 22.8 22.8 22.8 22.8 1 2008
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