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 and WIN websites (DEP 2010f; DEP 2018h) and filtered based on the stations (DEP 2010g) in the Moncrief Creek WBID 2228 (DEP 2014c) shown above. The filtered dataset was used to generate Table 2.21.

2.7.20.3. Discussion

Water quality data for Moncrief Creek are shown in Table 2.21. 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.  Average chlorophyll-a concentrations were higher in 2017 and 2018.

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.  Average fecal coliform concentrations continued to decrease from 2016 to 2018, as did the percentage of measurements that exceeded the 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 2014e), 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).  Concentrations of the heavy metals presented in Table 2.21 all decreased in 2018, while these same metal concentrations increased in some of the other tributaries.

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).

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

Table 2.21 Water quality data for Moncrief Creek.

 Water QualityAverage and Number of Samples º
ParameterCriteria (SW)201620172018
Dissolved Oxygen (mg/L)≥4.04.70
(15 of 36 samples)
5.33
(7 of 27 samples)
7.52
(2 of 44 samples)
Total Nitrogen (mg/L)<1.540.75
(0 of 3 samples)
0.74
(0 of 3 samples)
0.77
(1 of 30 samples)
Total Phosphorus (mg/L)<0.120.13
(4 of 6 samples)
0.14
(5 of 10 samples)
0.13
(7 of 45 samples)
Chlorophyll-a (µg/L)<5.47.02
(2 of 4 samples)
10.76
(3 of 7 samples)
10.45
(20 of 47 samples)
Arsenic (µg/L)≤5011.55
(0 of 4 samples)
7.31
(0 of 7 samples)
1.55
(0 of 13 samples)
Cadmium (µg/L)≤8.80.22
(0 of 4 samples)
0.09
(0 of 7 samples)
0.01
(0 of 13 samples)
Copper (µg/L)≤3.72.90
(1 of 4 samples)
4.01
(2 of 7 samples)
0.84
(0 of 13 samples)
Lead (µg/L)≤8.51.27
(0 of 4 samples)
2.18
(0 of 7 samples)
0.38
(0 of 13 samples)
Nickel (µg/L)≤8.30.90
(0 of 4 samples)
0.87
(0 of 7 samples)
0.67
(0 of 13 samples)
Silver (µg/L)≤0.92*0.03
(0 of 4 samples)
0.02
(0 of 7 samples)
0.01
(0 of 13 samples)
Zinc (µg/L)≤8610.92
(0 of 4 samples)
10.30
(0 of 7 samples)
7.12
(0 of 13 samples)
Fecal Coliform (CFU/100 mL)<4001900
(18 of 32 samples)
810
(10 of 21 samples)
620
(13 of 47 samples)
Turbidity (NTU)<295.57
(0 of 4 samples)
17.07
(1 of 7 samples)
9.36
(3 of 49 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.