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 website (DEP 2010e) and filtered based on the stations (DEP 2010f) in Open Creek WBID 2299A (marine) and 2299B (freshwater) (DEP 2014c) shown above. The filtered dataset was used to generate Table 2.19.

2.7.21.3. Discussion

Water quality data for Open Creek are shown in Table 2.19, 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).

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. 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 2016 Annual Progress Report for this BMAP listed 18 active, ongoing projects underway by FDOT and JEA to address the BMAP in the Open Creek watershed (DEP 2017c).  Measurements from the past three years still show average fecal coliform concentrations around the WQC, although the frequency of measurements that exceed the WQC decreased in 2017.

No recent measurements were available in 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 2.19 Water quality data for Open Creek (2015-2017).

 Water QualityAverage and Number of Samples º
ParameterCriteria201520162017
Dissolved Oxygen (mg/L)≥34% sat.
(≥3.0) FW
No data5.78
(0 of 9 samples)
5.69
(0 of 8 samples)
≥4.0 SW5.47
(2 of 12 samples)
6.00
(0 of 3 samples)
6.29
(0 of 4 samples)
Nitrate-nitrite N (mg/L)§§No dataNo data0.20
(4 samples)
Total Phosphorus (mg/L)<0.12No dataNo data0.05
(0 of 4 samples)
Chlorophyll-a (µg/L)<20 FWNo dataNo dataNo data
<5.4 SWNo dataNo data3.20
(0 of 4 samples)
Fecal Coliform (CFU/100 mL)<400510
(7 of 12 samples)
650
(9 of 12 samples)
380
(2 of 7 samples)
Turbidity (NTU)<29No dataNo data2.70
(0 of 4 samples)
Note: Hardness-dependent freshwater criteria for cadmium, copper, lead, nickel, and zinc were generated based on a hardness concentration of 100 mg/L.
º = Number of samples below WQC for Dissolved Oxygen, Number of samples above WQC 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.
§ = No water quality criterion has been established for Nitrate-Nitrite nitrogen. No Total Nitrogen data were available in STORET for 2015-2017.