2.7.24. Pottsburg Creek About Pottsburg Creek

Figure 2.58
Figure 2.59 The Pottsburg Creek Tributary (WBID 2265B).
  • East of the St. Johns River at the Butler Blvd./I-95 interchange
  • Primary Land Use: Residential
  • Current TMDL reports: Fecal coliform with BMAP (2010), Mercury
  • Verified Impaired 2016 (final): Iron (med)
  • WBID Area: 9.1 sq. mi.
  • Beneficial Use: Class III F (Recreational – Freshwater) 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 the Pottsburg Creek WBID 2265B, 2265C (freshwater), and 2265D (marine) (DEP 2014c) shown above. The filtered dataset was used to generate Table 2.25. Discussion

Water quality data for Pottsburg Creek are shown in Table 2.25, but only a handful of measurements are available in STORET for these parameters between 2015 and 2017. Average phosphorus levels were higher than the WQC in 2017 (DEP 2015c; DEP 2016e; DEP 2016k) and near the WQC in 2018.  The percentage of measurements exceeding the WQC dropped sharply in 2018. Historically, average dissolved oxygen and chlorophyll-a were within limits, although chlorophyll-a concentrations in the marine/estuarine regions of Pottsburg Creek exceeded the WQC in 2017 and 2018.

Average fecal coliform concentrations from 1999-2012 were well above the WQC, and fecal coliform levels in this residential tributary were identified as impaired in 2004. Consequently, a TMDL for fecal coliform was published (Rhew 2009d).  A BMAP for Pottsburg Creek (DEP 2010a) was legally adopted in August 2010. It describes sources of fecal coliform in the watershed, and completed and ongoing activities conducted by state and local agencies that are anticipated to reduce fecal coliform loading in the tributary. Additional information about fecal coliform in the tributaries can be found in Section 2.6 and Table 2.2.

Annual Progress Reports for this BMAP were published annually between 2011 and 2016, listing repairs, inspections, evaluations, and other improvements conducted by JEA, the Duval County Health Department, COJ, and FDOT. In the 2016 Annual Progress Report, 34% of Pottsburg Creek fecal coliform measurements over a 7.5 year period ending June 30, 2016 exceeded the water quality criterion (400 CFU/100 mL) (DEP 2017c). Pottsburg Creek remains impaired for fecal coliform, and the size of the exceedances has increased since implementation of the BMAP; the median exceedance increased from 800 CFU/100 mL in the TMDL report to 1,532 CFU/100 mL in the first phase of the BMAP (2010-2014) (DEP 2016b). No fecal coliform data were available in STORET between 2007 and 2017, but measurements from 2018 show decreases in fecal coliform levels compared to what was reported in the BMAP documents. As of 2016, there were 24 projects either planned or currently underway by COJ, JEA, and FDOT to address the BMAP in the Pottsburg Creek watershed (DEP 2017c).

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

Table 2.25 Water quality data for Pottsburg Creek.

 Water QualityAverage and Number of Samples º
Dissolved Oxygen (mg/L)≥34% sat. (≥3.0) FWNot availableNot available6.22
(0 of 14 samples)
≥4.0 SWNot availableNot available6.42
(4 of 19 samples)
Total Nitrogen (mg/L)<1.54Not available0.89
(0 of 5 samples)
(0 of 23 samples)
Total Phosphorus (mg/L)<0.12Not available0.15
(3 of 4 samples)
(1 of 24 samples)
Chlorophyll-a (µg/L)<20 FWNot availableNot available2.10
(0 of 1 sample)
<5.4 SWNot available9.75
(1 of 4 samples)
(11 of 15 samples)
Arsenic (µg/L)≤50Not availableNot available1.28
(0 of 21 samples)
Cadmium (µg/L)≤0.3 FWNot availableNot available0.01
(0 of 10 samples)
≤8.8 SWNot availableNot available0.01
(0 of 11 samples)
Copper (µg/L)≤9.3 FWNot availableNot available1.23
(0 of 10 samples)
≤3.7 SWNot availableNot available1.63
(0 of 11 samples)
Lead (µg/L)≤3.2 FWNot availableNot available0.21
(0 of 10 samples)
≤8.5 SWNot availableNot available1.25
(0 of 11 samples)
Nickel (µg/L)≤52 FWNot availableNot available1.11
(0 of 10 samples)
≤8.3 SWNot availableNot available0.62
(0 of 11 samples)
Silver (µg/L)≤0.07 FWNot availableNot available0.01
(0 of 10 samples)
≤0.92 SWNot availableNot available0.01
(0 of 11 samples)
Zinc (µg/L)≤120 FWNot availableNot available3.50
(0 of 10 samples)
≤86 SWNot availableNot available5.23
(0 of 11 samples)
Fecal Coliform (CFU/100 mL)<400Not availableNot available200
(4 of 28 samples)
Turbidity (NTU)<29Not available3.45
(0 of 4 samples)
(0 of 24 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.