2.7.13. Goodbys Creek

2.7.13.1. About Goodbys Creek

Figure 2.44
Figure 2.45 The Goodbys Creek Tributary (WBID 2326).
  • East of the St. Johns River opposite NAS Jacksonville
  • Primary Land Use: Residential
  • Current TMDL reports: Fecal Coliform with BMAP (2009), Mercury
  • Verified Impaired 2016 (final): None
  • WBID Area: 5.1 sq. mi.
  • Beneficial Use: Class III F (Recreational – Freshwater)

2.7.13.2. 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 Goodbys Creek WBID 2326, 2326A (freshwater), and 2326B (DEP 2014c) shown above. The filtered dataset was used to generate Table 2.14.

2.7.13.3. Discussion

Water quality data for Goodbys Creek are shown in Table 2.14. Previous average phosphorus levels in Goodbys Creek exceeded the recently updated WQC (EPA 2010b), but recent data suggest that the average phosphorus levels have held roughly steady near the WQC.  Average dissolved oxygen in the freshwater portion of Goodbys Creek (2326A) is above the WQC, and measurements in the saltwater portion (2326B) indicate improving dissolved oxygen levels over the past three years.  Similarly, chlorophyll-a concentrations in the freshwater portion of Goodbys Creek were within acceptable limits, but average chlorophyll-a concentrations in the marine portion exceeded the WQC.  There are limited data in WIN or STORET regarding water quality in general in the marine portion of Goodbys Creek.

The fecal coliform level, averaged over all the stations in Goodbys Creek, is below the critical level of 2.6, which is the logarithm of the state maximum of 400 colony-forming-units per 100 mL. A TMDL report is available for fecal coliform in Goodbys Creek (Wainwright 2005b). (Note: the data analyses in the TMDL are based on different criteria than that used in this report). Subsequently, a BMAP for Goodbys Creek was legally adopted in 2009 (DEP 2009b).  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 Goodbys Creek watershed (DEP 2017c). FDEP reported improvement in the frequency of fecal coliform exceedances in the marine segment of Goodbys Creek, and recent fecal coliform measurements had agreed with this assessment. Average fecal coliform concentrations appear to be trending downward and were around the WQC in 2017 but rose again in 2018. Additional information about fecal coliform in the tributaries can be found in Section 2.6 and Table 2.2.

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

Table 2.14 Water quality data for Goodbys Creek.

 Water QualityAverage and Number of Samples º
ParameterCriteria201620172018
Dissolved Oxygen (mg/L)≥34% sat. (≥3.0) FW5.02
(3 of 12 samples)
5.14
(0 of 9 samples)
5.91
(0 of 12 samples)
≥4.0 SW2.40
(1 of 1 samples)
4.06
(2 of 4 samples)
6.66
(0 of 12 samples)
Total Nitrogen (mg/L)<1.54Not available0.74
(0 of 9 samples)
0.73
(0 of 20 samples)
Total Phosphorus (mg/L)<0.12Not available0.13
(0 of 6 samples)
0.09
(7 of 20 samples)
Chlorophyll-a (µg/L)<20 FWNot available1.70
(0 of 2 samples)
2.41
(0 of 12 samples)
<5.4 SWNot available12.43
(3 of 4 samples)
24.19
(8 of 8 samples)
Arsenic (µg/L)≤50 FWNot available4.18
(0 of 2 samples)
3.07
(0 of 12 samples)
Cadmium (µg/L)≤0.3 FWNot available0.01
(0 of 2 samples)
0.01
(0 of 12 samples)
Copper (µg/L)≤9.3 FWNot available0.40
(0 of 2 samples)
0.81
(0 of 12 samples)
Lead (µg/L)≤3.2 FWNot available0.10
(0 of 2 samples)
0.15
(0 of 12 samples)
Nickel (µg/L)≤52 FWNot available0.35
(0 of 2 samples)
0.53
(0 of 12 samples)
Silver (µg/L)≤0.07 FWNot available0.01
(0 of 2 samples)
0.01
(0 of 12 samples)
Zinc (µg/L)≤120 FWNot available2.50
(0 of 2 samples)
2.50
(0 of 12 samples)
Fecal Coliform (CFU/100 mL)<400530
(7 of 13 samples)
380
(2 of 6 samples)
1900
(14 of 23 samples)
Turbidity (NTU)<29Not available5.97
(0 of 6 samples)
7.90
(7 of 20 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.