2.7.17. Julington Creek

2.7.17.1. About Julington Creek

Figure 2.49
Figure 2.50 The Julington Creek Tributary (WBID 2351).
  • East of the St. Johns River at the I-95/I-295/9A intersection
  • Primary Land Use: Marsh/Wetland (Land Cover)
  • Current TMDL reports: Fecal Coliform
  • Verified Impaired 2016 (final): Iron (med)
  • WBID Area: 20.4 sq. mi.
  • Beneficial Use: Class III F (Recreational – Freshwater)

2.7.17.2. Data sources

Result data was downloaded from the FL STORET website (DEP 2010e) and filtered based on the stations (DEP 2010f) in Julington Creek WBID 2351 (DEP 2014d) shown above. The filtered dataset was used to generate Table 2.18.

2.7.17.3. Discussion

Water quality data for Julington Creek are shown in Table 2.18. The fecal coliform level, averaged over all the stations in Julington Creek, is above the reference level of 2.6, which is the logarithm of the state maximum of 400 colony-forming-units (cfu) per 100 mL. Thus, a TMDL for fecal coliform was published in 2009 (Rhew 2009c). (Note: the data analyses in the TMDL are based on different criteria than that used in this report). Julington Creek is also an area in which relatively high ammonia levels have been measured. Julington Creek was identified as being impaired for iron (DEP 2016j).

Table 2.18 Water quality data for Julington Creek.
Water QualityConcentrationSampling
ParameterCriteria (FW)LowAverageHighSamplesPeriod
Dissolved Oxygen (mg/L)34% sat. (~3.0)0.55.711.961741999 - 2016
Total Nitrogen (mg/L)<1.540.491.092.22751999 - 2012
Total Phosphorus (mg/L)<0.1200.070.211231999 - 2012
Chlorophyll-a (µg/L)<200.11.25.59382002 - 2012
Arsenic (µg/L)≤500.041.092.8242004 - 2009
Cadmium (µg/L)≤0.300.111.2402004 - 2009
Copper (µg/L)≤9.30.172.5710.53562004 - 2009
Lead (µg/L)≤3.201.0214352004 - 2008
Nickel (µg/L)≤5200.577482004 - 2009
Silver (µg/L)≤0.0700.150.36182004 - 2009
Zinc (µg/L)≤1200.15.3321.48592004 - 2009
Fecal Coliform (log #/100 mL)<2.612.673.78941999 - 2016
Turbidity (NTU)<290.67.0524.4651999 - 2012
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.