In this section
Cannon Springs main view
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.
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).
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
|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|
|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|
mg/L = milligrams per liter
cfs = cubic feet per second