2.7.4. Black Creek

2.7.4.1. About Black Creek

Figure 2.26
Figure 2.27 The Black Creek Tributary (WBID 2415A/B/C).
  • West of the St Johns River at the Clay/Duval county line
  • Primary Land Use: Forested
  • Current TMDL reports: Lead – 2415B, 2415C
  • Verified Impaired 2016 (final): None
  • WBID Area: 15.4 sq. mi.
  • Beneficial Use: Class III F (Recreational – Freshwater)

2.7.4.2. Data sources

Result data were downloaded from the FL STORET website (DEP 2010e) and filtered based on the stations (DEP 2010f) in Black Creek WBID 2415A/B/C (DEP 2014c) shown above. The aggregate (all three WBIDs) filtered dataset was used to generate Table 2.4.

2.7.4.3. Discussion

Water quality data for Black Creek are shown in Table 2.4. As compared to other tributaries in the LSJRB, Black Creek is less impacted for the majority of the assessed water quality parameters. Lead has been identified as impaired in Black Creek and a TMDL report was published in 2009 (Lewis and Mandrup-Poulsen 2009) to address this issue.  Other metals, such as copper, nickel, and silver were detected previously at higher concentrations, but water quality data from recent years suggest that the concentrations of these metals have been reduced and controlled.

No recent measurements were available in STORET between 2015 and 2017 for the following parameter:

  • Fecal coliform

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

Table 2.4 Water quality data for Black Creek (2015-2017).

 Water QualityAverage and Number of Samples º
ParameterCriteria201520162017
Dissolved Oxygen (mg/L)≥34% sat. (≥3.0)5.62
(0 of 12 samples)
5.17
(0 of 14 samples)
5.23
(0 of 8 samples)
Nitrate-nitrite N (mg/L)§§0.04
(12 samples)
0.05
(13 samples)
0.06
(7 samples)
Total Phosphorus (mg/L)<0.120.08
(1 of 8 samples)
0.08
(0 of 23 samples)
0.08
(0 of 13 samples)
Chlorophyll-a (µg/L)<201.62
(0 of 12 samples)
1.70
(0 of 13 samples)
1.68
(0 of 7 samples)
Arsenic (µg/L)≤500.95
(0 of 12 samples)
1.13
(0 of 12 samples)
0.99
(0 of 7 samples)
Cadmium (µg/L)≤0.30.00
(0 of 12 samples)
0.03
(0 of 12 samples)
0.01
(0 of 7 samples)
Copper (µg/L)≤9.30.84
(0 of 12 samples)
1.11
(0 of 12 samples)
0.85
(0 of 7 samples)
Lead (µg/L)≤3.20.54
(0 of 12 samples)
0.42
(0 of 12 samples)
0.39
(0 of 7 samples)
Nickel (µg/L)≤520.54
(0 of 12 samples)
0.51
(0 of 12 samples)
0.44
(0 of 7 samples)
Silver (µg/L)≤0.070.00
(0 of 12 samples)
0.00
(0 of 12 samples)
0.01
(0 of 7 samples)
Zinc (µg/L)≤1206.87
(0 of 12 samples)
5.91
(0 of 12 samples)
3.39
(0 of 7 samples)
Turbidity (NTU)<293.94
(0 of 11 samples)
2.45
(0 of 13 samples)
2.63
(0 of 6 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.