2.7.7. Cedar River

2.7.7.1. 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)

2.7.7.2. Data sources

Result data were downloaded from the FL STORET and WIN websites (DEP 2010f; DEP 2018h) and filtered based on the stations (DEP 2010g) in Cedar River WBID 2262 and 2213P2 (DEP 2014c) shown above. The filtered dataset was used to generate Table 2.8.

2.7.7.3. 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 above the WQC over the past three years. Average total phosphorus levels have been near to or higher than the recently updated WQC (DEP 2015c; DEP 2016e; DEP 2016k). Heavy metal concentrations increased in 2018, with several water samples exceeding the WQC for cadmium and silver.

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.

Historical water quality data for the Cedar River are available in previous versions of the River Report.

Table 2.8 Water quality data for the Cedar River.

 Water QualityAverage and Number of Samples º
ParameterCriteria (FW)201620172018
Dissolved Oxygen (mg/L)≥34% sat. (≥3.0)7.40
(0 of 6 samples)
8.09
(0 of 3 samples)
7.10
(1 of 21 samples)
Total Nitrogen (mg/L)<1.540.73
(0 of 5 samples)
Not availableNot available
Total Phosphorus (mg/L)<0.120.10
(4 of 10 samples)
0.14
(4 of 6 samples)
0.09
(2 of 12 samples)
Chlorophyll-a (µg/L)<2014.11
(1 of 6 samples)
18.68
(2 of 3 samples)
26.69
(1 of 6 samples)
Arsenic (µg/L)≤501.87
(0 of 6 samples)
1.64
(0 of 3 samples)
4.10
(0 of 5 samples)
Cadmium (µg/L)≤0.30.01
(0 of 6 samples)
0.01
(0 of 3 samples)
0.31
(3 of 5 samples)
Copper (µg/L)≤9.32.28
(0 of 6 samples)
1.97
(0 of 3 samples)
4.40
(0 of 5 samples)
Lead (µg/L)≤3.21.09
(0 of 6 samples)
0.93
(0 of 3 samples)
1.72
(1 of 5 samples)
Nickel (µg/L)≤520.56
(0 of 6 samples)
0.57
(0 of 3 samples)
1.70
(0 of 5 samples)
Silver (µg/L)≤0.070.00
(0 of 6 samples)
0.02
(1 of 3 samples)
0.31
(3 of 5 samples)
Zinc (µg/L)≤1207.44
(0 of 6 samples)
5.98
(0 of 3 samples)
24.00
(0 of 5 samples)
Fecal Coliform (CFU/100 mL)<400Not availableNot available1100
(9 of 16 samples)
Turbidity (NTU)<293.01
(0 of 6 samples)
4.94
(0 of 3 samples)
5.14
(0 of 7 samples)
Note: Hardness-dependent freshwater criteria for cadmium, copper, lead, nickel, and zinc were generated based on a hardness concentration of 100 mg/L.
° = Number of samples below Water Quality Criteria for Dissolved Oxygen; Number of samples above Water Quality Criteria for all other parameters.
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.