2.7.7. Cedar River About the Cedar River

Figure 2.31
Figure 2.32 The Cedar River Tributary (WBID 2262 and 2213P2).
  • At the I-10/I-295 Interchange
  • Primary Land Use: Residential/Forested
  • Current TMDL reports: Fecal/Total Coliform – 2262
  • Verified Impaired 2016 (final): Iron (2213P2, 2262B med)
  • WBID Area: 22.8 sq. mi.
  • Beneficial Use: Class III F (Recreational – Freshwater) Data sources

Result data were downloaded from the FL STORET website (DEP 2010e) and filtered based on the stations (DEP 2010f) in Cedar River WBID 2262 and 2213P2 (DEP 2014d) shown above. The filtered dataset was used to generate Table 2.8. Discussion

Water quality data for the Cedar River are shown in Table 2.8. The Cedar River feeds into the Ortega River and thus is not directly a tributary of the St. Johns River. Even so, the Cedar River is tidal in nature varying in height by ~1 ft over the course of a day (SJRWMD 2010d). Salinity levels, as influenced by tidal movement, are relatively low indicating that the Ortega River buffers the Cedar River significantly from marine water intrusion. Average dissolved oxygen levels were mostly above the WQC and stable across the river (Figure 2.33). Average total phosphorus levels were higher than the recently updated WQC (DEP 2015d; DEP 2016e; DEP 2016k), as were average levels of chlorophyll-a. Metal concentrations are mostly within acceptable limits, with the exception of copper and nickel, which are slightly elevated.

Table 2.8 Water quality data for the Cedar River.
Water QualityConcentrationSampling
ParameterCriteria (FW)LowAverageHighSamplesPeriod
Dissolved Oxygen (mg/L)34% sat. (~3.0)0.665.8412.42501998 - 2016
Total Nitrogen (mg/L)<1.540.190.994.711621998 - 2014
Total Phosphorus (mg/L)< - 2016
Chlorophyll-a (µg/L)<200.2820.61401341998 - 2016
Arsenic (µg/L)≤500.0054.2243.7831998 - 2016
Cadmium (µg/L)≤0.30.0010.3310671998 - 2016
Copper (µg/L)≤ - 2016
Lead (µg/L)≤3.202.74201901998 - 2016
Nickel (µg/L)≤520.033.4340721998 - 2016
Silver (µg/L)≤0.0700.312.28252005 - 2016
Zinc (µg/L)≤1206.4814.8249.33921998 - 2016
Fecal Coliform (log #/100 mL)<2.612.495.23801999 - 2012
Turbidity (NTU)<291.866.82190.81081998 - 2016
Note: Hardness-dependent freshwater criteria for cadmium, copper, lead, nickel, and zinc were generated based on a hardness concentration of 100 mg/L.
FW = freshwater; SW = saltwater (marine). Values denoted with (*) indicate a proposed criterion, which has not yet been adopted.
Values denoted with (†) are reference values based on EPA criteria (EPA 2010b), but the water body is not regulated by this standard.

In 2004, Cedar River was identified as being impaired for both fecal and total coliforms (i.e., levels significantly above 400 CFU/100 mL) and as a result, a TMDL report was finalized in 2006 (Magley 2006b). (Note: the data analyses in the TMDL are based on different criteria than that used in this report). Currently, a Basin Management Action Plan (BMAP) to address this impairment is under development, but the timeframe for its release is currently unknown.

Figure 2.32
Figure 2.33 Variation of the dissolved oxygen in the Cedar River going upstream (left to right). Data from 1998-2014.