2.7.21. Open Creek

2.7.21.1. 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)

2.7.21.2. 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 Open Creek WBID 2299A (marine) and 2299B (freshwater) (DEP 2014c) shown above. The filtered dataset was used to generate Table 2.22.

2.7.21.3. Discussion

Water quality data for Open Creek are shown in Table 2.22, but the number of measurements reported in STORET is very limited. Total phosphorus, dissolved oxygen, and turbidity were in the normal range in 2017. Open Creek has been identified as impaired for mercury (DEP 2016j) and is addressed in the statewide mercury TMDL already in place (DEP 2013c).

Fecal coliform levels, averaged over all the stations in Open Creek, remain around the WQC. However, there is some variation in the levels dependent on the location. 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). Additional information about fecal coliform in the tributaries can be found in Section 2.6 and Table 2.2.  The last Annual Progress Report for this BMAP was published in 2016 and listed 18 active, ongoing projects underway by FDOT and JEA to address the BMAP in the Open Creek watershed (DEP 2017c).

No recent measurements were available in WIN or STORET between 2015 and 2017 for the following parameters:

  • Arsenic
  • Cadmium
  • Copper
  • Lead
  • Nickel
  • Silver
  • Zinc

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

Table 2.22 Water quality data for Open Creek.

 Water QualityAverage and Number of Samples º
ParameterCriteria201620172018
Dissolved Oxygen (mg/L)≥34% sat. (≥3.0) FW5.78
(0 of 9 samples)
5.69
(0 of 8 samples)
6.41
(0 of 6 samples)
≥4.0 SW6.00
(0 of 3 samples)
6.29
(0 of 4 samples)
5.79
(1 of 5 samples)
Total Nitrogen (mg/L)<1.54Not availableNot available0.79
(0 of 12 samples)
Total Phosphorus (mg/L)<0.12Not available0.05
(0 of 4 samples)
0.06
(0 of 10 samples)
Chlorophyll-a (µg/L)<20 FWNot availableNot available3.88
(0 of 6 samples)
<5.4 SWNot available3.20
(0 of 4 samples)
3.31
(0 of 4 samples)
Fecal Coliform (CFU/100 mL)<400650
(9 of 12 samples)
380
(2 of 7 samples)
410
(3 of 6 samples)
Turbidity (NTU)<29Not available2.70
(0 of 4 samples)
4.04
(0 of 10 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.