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
Magnesia Spring main view

Magnesia Spring main view

Magnesia Spring

Alachua County

Description

Magnesia Spring is a fourth-magnitude spring. The spring vent is located in the bottom of a deep, 60-foot by 75-foot oval-shaped pool with aquatic vegetation and algae. Two artesian wells on the side of the pool supplement the spring flow as it runs toward the west about 800 feet to Lochloosa Creek. The spring is located on private property.

Discharge

Magnesia Spring outflow

Magnesia Spring outflow

Discharge at Magnesia Spring was measured by the U.S. Geological Survey (USGS) five times from 1941 to 1972. The difference between the minimum and maximum discharges is 1.8 cubic feet per second (cfs) over the period. The maximum measured discharge of 1.82 cfs occurred in December 1941; the minimum discharge of 0.02 cfs occurred in April 1972. The mean and median discharges for the period are 0.79 cfs and 0.65 cfs, respectively (see the table below).

Water quality

Magnesia Spring was sampled by USGS in 1956, 1960, and 1972. St. Johns River Water Management District sampled Magnesia Spring in 2000. Summary statistics of the water quality data for selected variables are shown in the table below.

Summary statistics of water quality and discharge at Magnesia Spring

Magnesia Spring Min Mean Median Max Count Period
Discharge, cfs 0.02 0.79 0.65 1.82 5 1941−1972
Alkalinity, total, mg/L as CaCO3 141.0 144.8 145.1 148.0 4 1956−2000
Calcium, total, mg/L as Ca 38.4 38.4 38.4 38.4 1 2000
Chloride, total, mg/L as Cl 7.0 8.9 8.3 12.0 4 1956−2000
Fluoride, total, mg/L as F 0.38 0.38 0.38 0.38 1 2000
Magnesium, total, mg/L as Mg 12.3 12.3 12.3 12.3 1 2000
Nitrate + nitrite, total, mg/L as N 0.00 0.00 0.00 0.00 1 2000
Orthophosphate, total, mg/L as P 0.01 0.01 0.01 0.01 1 2000
pH, field 7.40 7.95 8.05 8.30 4 1956−2000
Sodium, total, mg/L as Na 5.8 5.8 5.8 5.8 1 2000
Specific conductance, field, µmhos/cm at 25°C 300 300 300 300 1 2000
Specific conductance, lab, µmhos/cm at 25°C 278 300 304 317 3 1956−1972
Sulfate, total, mg/L as SO4 4.9 5.2 5.2 5.6 3 1960−2000
Total dissolved solids, mg/L 178 184 181 192 3 1960−2000
Water temperature, °C 20.0 21.6 22.2 22.5 3 1960−2000
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