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
St. Johns River Water Management District - www.sjrwmd.com

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Water bodies, watersheds and storm water
Mud Spring main view

Mud Spring main view

Mud Spring boil

Mud Spring boil

Mud Spring

Putnam County

Description

Mud Spring is a fourth-magnitude spring with an oval-shaped pool about 85 feet long and 65 feet wide. The spring flows from a vertical vent in the center of the pool, producing a prominent boil on the surface. The spring forms the head of Mud Creek, with the discharge flowing down a meandering run toward the southwest for about 1 mile to Little Lake George. The spring is situated along a hiking trail and is a popular picnic area in the state forest.

Discharge

Mud Spring boil close-up

Mud Spring boil close-up

Discharge at Mud Spring was measured by St. Johns River Water Management District 12 times from 1995 to 2001. The difference between the minimum and maximum discharges is 2.73 cubic feet per second (cfs) over the period. The maximum measured discharge of 3.16 cfs occurred in May 1978; the minimum discharge of 0.43 cfs occurred in May 1999. The mean and median discharges for the period are 1.16 cfs and 0.75 cfs, respectively (see the table below).

Water quality

Mud Spring was sampled 15 times by the district from 1995 to 2001. Summary statistics of the water quality data for selected variables are shown in the table below.

Summary statistics of water quality and discharge at Mud Spring

Mud Spring Min Mean Median Max Count Period
Discharge, cfs 0.43 1.16 0.75 3.16 12 1995−2001
Alkalinity, total, mg/L as CaCO3 80.0 83.6 83.0 88.0 13 1995−2001
Calcium, total, mg/L as Ca 35.8 39.1 38.5 46.0 14 1995−2001
Chloride, total, mg/L as Cl 223.6 249.5 251.5 296.0 13 1995−2001
Dissolved Oxygen 0.36 0.36 0.36 0.36 1 2001
Fluoride, total, mg/L as F 0.14 0.15 0.15 0.17 14 1995−2001
Magnesium, total, mg/L as Mg 15.6 17.9 17.8 19.7 14 1995−2001
Nitrate + nitrite, total, mg/L as N 0.01 0.02 0.02 0.03 10 1996−2001
Orthophosphate, total, mg/L as P 0.06 0.08 0.08 0.11 14 1995−2001
pH, field 7.25 7.68 7.67 8.05 12 1995−2001
Phosphorus, total, mg/L as P 0.08 0.08 0.08 0.08 1 2001
Potassium, total, mg/L as K 3.8 4.4 4.2 5.4 14 1995−2001
Sodium, total, mg/L as Na 115.3 134.5 132.7 170.0 14 1995−2001
Specific conductance, field, µmhos/cm at 25°C 943 1056 1036 1272 14 1995−2001
Specific conductance, lab, µmhos/cm at 25°C 1010 1129 1117 1272 4 1995−2001
Sulfate, total, mg/L as SO4 33.5 39.0 39.2 43.0 14 1995−2001
Total dissolved solids, mg/L 489 570 567 667 12 1995−2001
Water temperature, °C 22.4 22.8 22.8 23.2 15 1995−2001
Units: µmhos/cm = micromhos per centimeter
         mg/L = milligrams per liter
         cfs = cubic feet per second

Age of discharge water

The age of water discharging from Mud Spring was determined by measuring the concentration of tritium, delta carbon-13, and carbon-14 in the spring discharge, which was measured in May 2001. Mud Spring had a tritium concentration of 2.69 tritium units, which suggests that the water is less than 48 years old. Mud Spring had a delta carbon-13 value of −8.98 parts per thousand and a carbon-14 concentration of 34% modern carbon, which results from the mixing of Upper and Lower Floridan aquifer water. The Fontes and Garnier (1979) carbon-14 age is 423 years old.

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