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
Green Springs main view

Green Springs main view

Green Springs

Volusia County


Green Springs is a third-magnitude spring with a roughly circular pool about 90 feet in diameter. Water in the pool is milky green with poor visibility. Rosenau et al (1977) reported that the pool is about 125 feet deep in its north-central part, with a conical-shaped hole in the limestone that gradually diminishes in diameter with depth. An eastward extension of the pool is bordered on the north and east by a concrete retaining wall about 2 feet high. Spring flow is into a shallow run about 3 to 6 feet wide that flows toward the southeast for about 200 feet to a small creek, which then flows south 0.25 mile to Lake Monroe.


Green Springs run

Green Springs run

Discharge at Green Springs was measured sporadically by the U.S. Geological Survey (USGS) from 1932 to 1972. St. Johns River Water Management District measured discharge from 1995 to 2010 and currently measures discharge bimonthly. The difference between the minimum and maximum discharges is 2.92 cubic feet per second (cfs) over the period. The maximum measured discharge of 2.92 cfs occurred in November 2004. In 2000 and 2001, no discharge was measured four times, and in 2008, no discharge was measured two times. The mean and median discharges for the period are 1.45 cfs and 1.34 cfs, respectively (see the table below).

Green Springs Discharge Graph
Discharge Graph

Water quality

Green Springs was sampled by USGS in 1972. The district sampled Green Springs 44 times from 1995 to 2010 and currently samples the spring four times per year. Summary statistics of the water quality data for selected variables are shown in the table below.

Green Springs Water Quality Graph
Water Quality Graph

Summary statistics of water quality and discharge at Green Springs

Green Springs Min Mean Median Max Count Period
Discharge, cfs 0 1.45 1.34 2.92 99 1932−2010
Alkalinity, total, mg/L as CaCO3 109.0 160.2 158.3 200.0 45 1972−2010
Calcium, total, mg/L as Ca 60.4 86.1 87.8 97.0 44 1996−2010
Chloride, total, mg/L as Cl 166.6 625.7 690.0 836.0 45 1972−2010
Dissolved Oxygen 0.96 0.96 0.96 0.96 1 2001
Fluoride, total, mg/L as F 0.08 0.09 0.09 0.10 14 1996−2002
Magnesium, total, mg/L as Mg 12.4 39.2 41.8 48.4 44 1996−2010
Nitrate + nitrite, total, mg/L as N 0.01 0.04 0.03 0.14 24 1996−2009
Orthophosphate, total, mg/L as P 0.03 0.07 0.07 0.26 45 1996−2010
pH, field 6.86 7.44 7.41 8.10 46 1972−2010
Phosphorus, total, mg/L as P 0.06 0.08 0.08 0.15 29 2001−2010
Potassium, total, mg/L as K 4.7 10.9 11.8 13.5 44 1996−2010
Sodium, total, mg/L as Na 88.1 343.8 370.1 447.0 44 1996−2010
Specific conductance, field, µmhos/cm at 25°C 1113 2361 2417 3000 41 1996−2010
Specific conductance, lab, µmhos/cm at 25°C 1340 2454 2580 3040 31 1972−2010
Sulfate, total, mg/L as SO4 29.1 95.1 102.0 129.0 45 1972−2010
Total dissolved solids, mg/L 572 1386 1450 1930 43 1972−2010
Water temperature, °C 18.2 23.0 22.8 27.2 46 1972−2010
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 Green Springs was determined by measuring the concentration of tritium, delta carbon-13, and carbon-14 in the spring discharge, which was measured in January 2001. Green Springs had a tritium concentration of 2.48 tritium units, suggesting that the water is less than 43 years old. Green Springs had a delta carbon-13 value of −9.90 parts per thousand and a carbon-14 concentration of 49% modern carbon, which results from the mixing of Upper and Lower Floridan aquifer water. The adjusted carbon-14 age of Green Springs is recent.


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