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
Cannon Springs main view

Cannon Springs main view

Cannon Springs

Marion County

Description

Cannon Springs is a third-magnitude spring and is normally submerged by the Rodman Reservoir. At times of drawdown in the Rodman Reservoir, the spring pool and vent are more easily discernible. During periods of low water in the reservoir, water flows toward the northwest for approximately 0.75 mile to the Ocklawaha River.

Discharge

Cannon Springs canal looking downstream

Cannon Springs canal looking downstream

Discharge from Cannon Springs was measured by the U.S. Geological Survey (USGS) in March 1999 and by St. Johns River Water Management District in February 2002. The mean discharge was 9.09 cubic feet per second (see the table below).

Water quality

Cannon Springs was sampled by USGS in 1999 and by the district in 2002. A summary of the water quality data for selected variables is shown in the table below.

Summary statistics of water quality and discharge at Cannon Springs

Cannon Springs Min Mean Median Max Count Period
Discharge, cfs 8.3 9.09 9.09 9.88 2 1999−2002
Alkalinity, total, mg/L as CaCO3 59.9 59.9 59.9 59.9 1 2002
Calcium, total, mg/L as Ca 68.5 68.5 68.5 68.5 1 2002
Chloride, total, mg/L as Cl 410.0 424.0 424.0 437.9 2 1999−2002
Fluoride, total, mg/L as F 0.13 0.13 0.13 0.13 1 2002
Magnesium, total, mg/L as Mg 29.4 29.4 29.4 29.4 1 2002
Nitrate + nitrite, total, mg/L as N 0.16 0.16 0.16 0.16 1 2002
Orthophosphate, total, mg/L as P 0.01 0.01 0.01 0.01 1 2002
pH, field 6.76 7.31 7.31 7.85 2 1999−2002
Potassium, total, mg/L as K 7.2 7.2 7.2 7.2 1 2002
Sodium, total, mg/L as Na 248.4 248.4 248.4 248.4 1 2002
Specific conductance, field, µmhos/cm at 25°C 1802 1802 1802 1802 1 2002
Specific conductance, lab, µmhos/cm at 25°C 1669 1669 1669 1669 1 1999
Sulfate, total, mg/L as SO4 130.0 137.2 137.2 144.3 2 1999−2002
Total dissolved solids, mg/L 932 956 956 980 2 1999−2002
Water temperature, °C 22.7 22.9 22.9 23.1 2 1999−2002
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