2.7.21. Open Creek About Open Creek

Figure 2.54
Figure 2.55 Open Creek (WBID 2299A/B).
  • West of the Intracoastal Waterway
  • Primary Land Use: Residential
  • Current TMDL reports: Fecal Coliform with BMAP (2009), Mercury
  • Verified Impaired 2016 (final): None
  • WBID Area: 6.5 sq. mi.
  • Beneficial Use: Class III M & F (Marine – 2299A, Freshwater – 299B) Data sources

Result data were downloaded from the FL STORET website (DEP 2010e) and filtered based on the stations (DEP 2010f) in Open Creek WBID 2299A/B (DEP 2014d) shown above. The filtered dataset was used to generate Table 2.22. Discussion

Water quality data for Open Creek are shown in Table 2.22. Average nutrient levels (total nitrogen, total phosphorus, and dissolved oxygen) and turbidity were in the normal range. (Note: the datasets for these parameters are relatively small in comparison to other parts of the basin).

The fecal coliform level, averaged over all the stations in Open Creek, is elevated but below the critical level of 2.6, which is the logarithm of the state maximum of 400 colony-forming-units (cfu) per 100 mL. However, there is some variation in the levels dependent on the location. Figure 2.56 shows fecal coliform levels at various stations on Open Creek. All are above the water quality criterion except 20030848, which is near the intersection of Hodges Boulevard and Danforth Road.

A TMDL report (Wainwright and Hallas 2009b) was released in 2009 to address fecal coliform. (Note: the data analyses in the TMDL are based on different criteria than that used in this report). Subsequently, a BMAP to address this issue was legally adopted (DEP 2009b). Annual Progress Reports for this BMAP were issued in 2010 (DEP 2011a), 2011 (DEP 2012), and 2012 (DEP 2013a); they list repairs, inspections, evaluations, and other improvements conducted by JEA, the Duval County Health Department, COJ, and FDOT.

Open Creek has been identified as impaired for mercury (DEP 2016j) and is addressed in the statewide mercury TMDL already in place (DEP 2013e).

Table 2.22 Water quality data for Open Creek.
Water QualityConcentrationSampling
ParameterCriteria (FW)LowAverageHighSamplesPeriod
Dissolved Oxygen (mg/L)34% sat. FW ?4.0 SW0.85.55121772002 - 2016
Total Nitrogen (mg/L)<1.540.430.831.78352007 - 2012
Total Phosphorus (mg/L)< - 2012
Chlorophyll-a (µg/L)<20 FW <11 SW0.283.1711352007 - 2012
Arsenic (µg/L)≤50 FW ≤50 SWNo valid data available
Cadmium (µg/L)≤0.3 FW ≤8.8 SWNo valid data available
Copper (µg/L)≤9.3 FW ≤3.7 SWNo valid data available
Lead (µg/L)≤3.2 FW ≤8.5 SWNo valid data available
Nickel (µg/L)≤52 FW ≤8.3 SWNo valid data available
Silver (µg/L)≤0.07 FW ≤0.92* SWNo valid data available
Zinc (µg/L)≤120 FW ≤86 SWNo valid data available
Fecal Coliform (log #/100 mL)< - 2016
Turbidity (NTU)<291.54.8312.3472007 - 2013
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.


Figure 2.55
Figure 2.56 Fecal coliform in Open Creek from downstream to upstream. Data are presented as the log of the number of fecal coliform bacteria per 100 mL; the maximum, mean, and minimum values at each station are shown.