2.7.20. Moncrief Creek

2.7.20.1. About Moncrief Creek

Figure 2.52
Figure 2.53 The Moncrief Creek Tributary (WBID 2228).
  • North of downtown Jacksonville
  • Primary Land Use: Residential
  • Current TMDL reports: Fecal/Total Coliform with BMAP (2010), Mercury
  • Verified Impaired 2016 (final): Copper (2228A med), Iron (2228A med), Nutrients (Chlorophyll-a 228A med)
  • WBID Area: 5.9 sq. mi.
  • Beneficial Use: Class III F (Recreational – Marine)

2.7.20.2. Data sources

Result data were downloaded from the FL STORET website (DEP 2010e) and filtered based on the stations (DEP 2010f) in the Moncrief Creek WBID 2228 (DEP 2014c) shown above. The filtered dataset was used to generate Table 2.18.

2.7.20.3. Discussion

Water quality data for Moncrief Creek are shown in Table 2.18. Historical average phosphorus levels were higher than the recently updated WQC (DEP 2015c; DEP 2016e; DEP 2016k), and the average phosphorus levels have remained slightly above the WQC over the past three years. Dissolved oxygen concentrations were within acceptable limits.  Chlorophyll-a concentrations appear to be decreasing, but this is based on a small number of data points. Average copper concentrations were elevated relative to other tributaries, and the average copper concentrations was above the WQC in both 2015 and 2017.

A TMDL report for fecal coliform was published for Moncrief Creek in 2006 (Wainwright 2006b). (Note: the data analyses in the TMDL are based on different criteria than that used in this report). Subsequently, a BMAP for Moncrief Creek (DEP 2010a) was released in August 2010. It describes sources of fecal coliform in the watershed, and completed and ongoing activities conducted by state and local agencies that are anticipated to reduce fecal coliform loading in the tributary. Additional information about fecal coliform in the tributaries can be found in Section 2.6 and Table 2.2.

In the 2016 Annual Progress Report, 59% of Moncrief Creek fecal coliform measurements over a 7.5 year period ending June 30, 2016 exceeded the water quality criterion (400 CFU/100 mL) (DEP 2017c). While Moncrief Creek remains impaired for fecal coliform, the size of the exceedances has decreased since implementation of the BMAP; the median exceedance has decreased from 2,600 CFU/100 mL in the TMDL report to 1,300 CFU/100 mL in the first phase of the BMAP (2010-2014). (DEP 2016b).  Fecal coliform measurements from the past three years show improvements in the average fecal coliform concentration as well as in the frequency of measurements that exceed the fecal coliform WQC.  There were 28 projects either planned or currently underway in 2016 by COJ, JEA, and FDOT to address the BMAP in the Moncrief Creek watershed (DEP 2017c).

Moncrief Creek has been identified as impaired for copper and iron (DEP 2014f), but it has been delisted for lead (DEP 2016h). It was identified as being impaired for mercury, based on elevated levels of mercury in fish tissue; however, this is being delisted (DEP 2015a) as it has been addressed by the statewide mercury TMDL (DEP 2013c).

COJ has chosen Moncrief Creek as a focus watershed to monitor progress in the reduction of pollution from stormwater flows.  Stormwater is the main source of the headwaters of Moncrief Creek, and there were 22 stormwater treatment ponds in the Moncrief Creek watershed in 2017.  COJ plans to sample Moncrief Creek quarterly with respect to its effectiveness in stormwater treatment pollution reduction (COJ 2017).

Table 2.18 Water quality data for Moncrief Creek.

 Water QualityAverage and Number of Samples º
ParameterCriteria201520162017
Dissolved Oxygen (mg/L)≥4.04.93
(8 of 33 samples)
4.70
(15 of 36 samples)
5.33
(7 of 27 samples)
Nitrate-nitrite N (mg/L)§§0.13
(5 samples)
0.20
(4 samples)
0.10
(6 samples)
Total Phosphorus (mg/L)<0.120.17
(4 of 10 samples)
0.13
(4 of 6 samples)
0.14
(5 of 10 samples)
Chlorophyll-a (µg/L)<5.418.62
(3 of 5 samples)
7.02
(2 of 4 samples)
10.76
(3 of 7 samples)
Arsenic (µg/L)≤506.98
(0 of 4 samples)
11.55
(0 of 4 samples)
7.31
(0 of 7 samples)
Cadmium (µg/L)≤8.80.13
(0 of 4 samples)
0.22
(0 of 4 samples)
0.09
(0 of 7 samples)
Copper (µg/L)≤3.73.33
(2 of 4 samples)
2.90
(1 of 4 samples)
4.01
(2 of 7 samples)
Lead (µg/L)≤8.52.30
(0 of 4 samples)
1.27
(0 of 4 samples)
2.18
(0 of 7 samples)
Nickel (µg/L)≤8.30.98
(0 of 4 samples)
0.90
(0 of 4 samples)
0.87
(0 of 7 samples)
Silver (µg/L)≤0.92*0.00
(0 of 4 samples)
0.03
(0 of 4 samples)
0.02
(0 of 7 samples)
Zinc (µg/L)≤8616.52
(0 of 4 samples)
10.92
(0 of 4 samples)
10.30
(0 of 7 samples)
Fecal Coliform (CFU/100 mL)<4005500
(20 of 28 samples)
1900
(18 of 32 samples)
810
(10 of 21 samples)
Turbidity (NTU)<2910.80
(0 of 4 samples)
5.57
(0 of 4 samples)
17.07
(1 of 7 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.