In this section
Blue Spring main view
Blue Spring is a third-magnitude spring located along the south bank of the Ocklawaha River. The spring is presently submerged by the Rodman Reservoir. A large outline of the spring boil is visible on the reservoir’s surface.
Discharge from Blue Spring was measured by the U.S. Geological Survey at 10.6 cubic feet per second (cfs) in October 1935 and at 0.5 cfs in May 1999. St. Johns River Water Management District measured discharge twice in 2008. The mean discharge is 15.78 cfs (see the table below).
The district sampled Blue Spring for water quality in 2008 (see the table below).
Summary statistics of water quality and discharge at Blue Spring
|Blue Spring — Marion County||Min||Mean||Median||Max||Count||Period|
|Alkalinity, total, mg/L as CaCO3||49.6||49.6||49.6||49.6||1||2008|
|Calcium, total, mg/L as Ca||66.0||66.0||66.0||66.0||1||2008|
|Chloride, total, mg/L as Cl||509.0||509.0||509.0||509.0||1||2008|
|Magnesium, total, mg/L as Mg||29.0||29.0||29.0||29.0||1||2008|
|Nitrate + nitrite, total, mg/L as N||0.09||0.09||0.09||0.09||1||2008|
|Orthophosphate, total, mg/L as P||0.01||0.01||0.01||0.01||1||2008|
|Phosphorus, total, mg/L as P||0.02||0.02||0.02||0.02||1||2008|
|Potassium, total, mg/L as K||6.4||6.4||6.4||6.4||1||2008|
|Sodium, total, mg/L as Na||277.0||277.0||277.0||277.0||1||2008|
|Specific conductance, field, µmhos/cm at 25°C||1937||1937||1937||1937||1||2008|
|Specific conductance, lab, µmhos/cm at 25°C||1170||1170||1170||1170||1||2008|
|Sulfate, total, mg/L as SO4||119.0||119.0||119.0||119.0||1||2008|
|Total dissolved solids, mg/L||1080||1080||1080||1080||1||2008|
|Water temperature, °C||22.8||22.8||22.8||22.8||1||2008|
mg/L = milligrams per liter
cfs = cubic feet per second