Ocklawaha River Basin Group 1 Cycle 2 Assessment/Central District - Verified List Revised and Readopted May 2009

Hydrologic Unit: Ocklawaha River

May 15, 2009 1 of 8 Florida Department of Environmental Protection

OGC Case 

Number Planning Unit WBID Water Segment Name Waterbody Type

Waterbody 

Class1

1998 303(d) 

Parameters of 

Concern

Parameters 

Assessed Using the 

Impaired Waters 

Rule (IWR) pp = 

29/30 Potentially 

Impaired; vp = 

34/37 Impaired. 

Concentration 

Causing 

Impairment

Priority for TMDL 

Development2

Comments 

(# of Exceedances/ # of Samples) 

pp=Planning Period vp=Verified Period3

09-1999 Lake Apopka 2873C JOHNS LAKE LAKE 3F

Mercury (based on 

fish consumption 

advisory)

> DOH threshold 

(>0.3 mg/kg) High*

Data verified to be within the last 7.5 years. Confirmed recent data for 

freshwater fish advisory for Largemouth Bass. 12 Largemouth Bass 

samples, Hg mean concentration was 0.50 mg/Kg in 2003. 

09-2000 Lake Apopka 2873C JOHNS LAKE LAKE 3F Nutrients (TSI) TP = 0.03 mg/L Medium

pp = Potentially Impaired. 1 TSI annual mean exceeded the threshold. 

5 TSI annual means increased by more than 10 units over historical 

value (35.71 calculated based on TSI data from 1988 through 1992). 

Annual means were 47.7 (1995), 51.6 (1996), 55.6 (1997), 45.1 (1998), 

56.1 (1999), 60.8 (2000), 56.1 (2003), and 56.4 (2004). vp = Impaired. 

2 TSI annual means exceeded the threshold. 1 TSI annual mean 

increased by more than 10 units over historical value (35.71 calculated 

based on TSI data from 1988 through 1992). Annual means were 60.8 

(2000) and 45.0 (2006). In 2006, color annual mean was <40. 

Therefore, assessment threshold used was TSI 40. 18 Chla values, 

range 1 - 18 ug/L, median 9.55 ug/L. 39 Chla (corrected) values, range 

1 - 42.0 ug/L, median 8.54 ug/L. 54 TN values, range 0.004 - 2.62 ug/L, 

median 0.865 mg/L. 55 TP values, range 0.002 - 0.29 mg/L, median 

0.03 mg/L. Limited by phosphorus based on a median TN/TP ratio of 

31.64 (52 values) in the verified period.

09-2001 Lake Griffin 

Unit 2740F OCKLAWAHA 

RIVER/SUNNYHILL STREAM 3F Dissolved Oxygen Dissolved Oxygen < 5.0 mg/L Medium

pp = 84 / 125 Potentially Impaired; vp = 38 / 79 Impaired. DO met the 

verification threshold and TN and BOD were identified as the causative 

pollutants. 49 TN measurements, median 3.16 mg/L. 74 TP 

measurements, median 0.05 mg/L. 16 BOD measurements, median 

3.95 mg/L. The FDEP has drafted a TMDL report, which is now 

pending.

09-2002 Lake Griffin 

Unit 2740F OCKLAWAHA 

RIVER/SUNNYHILL STREAM 3F

Mercury (based on 

fish consumption 

advisory)

> DOH threshold 

(>0.3 mg/kg) High*

Data verified to be within the last 7.5 years. Confirmed recent data for 

freshwater fish advisory for Largemouth Bass. 24 Largemouth Bass 

samples, Hg mean concentration was 0.44 mg/Kg in 2003. 

09-2003 Lake Griffin 

Unit 2740F OCKLAWAHA 

RIVER/SUNNYHILL STREAM 3F Nutrients Nutrients 

(Chlorophyll-a) TP = 0.05 mg/L Medium

pp = 3 Chla annual means exceeded 20 ug/L Annual mean chla in three 

consecutive years(1998, 1999, and 2000) exceeded the historic 

minimum (9.75 ug/L calculated based on data from 1994 - 1998) by 

more than 50%. Impaired. Annual means were 4.54 ug/L (1995), 19.02 

ug/L (1996), 5.69 ug/L (1997), 61.65 ug/L (1999), 40.3 ug/L (2000), and 

35.52 ug/L (2001). 86 Chla values, range 1.02 - 236.42 ug/L, mean 

37.75 ug/L. 96 Chla (corrected) values, range 1.0 - 226.28 ug/L, mean 

33.84 ug/L. vp = 2 Chla annual means exceeded 20 ug/L. Annual 

mean Chla in two consecutive years(2000 and 2001) exceeded the 

historic minimum (9.75 ug/L calculated based on data from 1994 - 1998) 

by more than 50%. Impaired. Annual means were 40.3 ug/L (2000) and 

35.52 ug/L (2001). 63 Chla values, range 1.42 - 119.9 ug/L, mean 

47.63 ug/L. 74 Chla (corrected) values, range 1.0 - 111.83 ug/L, mean 

39.21 ug/L. 49 TN values, median 3.16 mg/L. 74 TP values, median 

0.05 mg/L. The median value of 49 TN/TP ratio is 61, suggesting 

phosphorus is the limiting nutrient. The FDEP has drafted a TMDL, 

which is now pending.

09-2004 Lake Griffin 

Unit 2797A ELLA LAKE LAKE 3F

Mercury (based on 

fish consumption 

advisory)

> DOH threshold 

(>0.3 mg/kg) High*

Data verified to be within the last 7.5 years. Confirmed recent data for 

freshwater fish advisory for Largemouth Bass. 12 Largemouth Bass 

samples, Hg mean concentration was 0.81 mg/Kg in 2005. 

09-2005 Lake Griffin 

Unit 2803A HOLLY LAKE LAKE 3F

Mercury (based on 

fish consumption 

advisory)

> DOH threshold 

(>0.3 mg/kg) High*

Data verified to be within the last 7.5 years. Confirmed recent data for 

freshwater fish advisory for Largemouth Bass. 12 Largemouth Bass 

samples, Hg mean concentration was 0.81 mg/Kg in 2005. 

09-2006 Lake Griffin 

Unit 2809 NONCONTRIBUTING 

AREA STREAM 3F Nutrients Nutrients 

(Chlorophyll-a) N/A Medium

pp = One Chla annual mean value exceeded 20 ug/L. Annual mean 

was 76.7 ug/L (1995). 2 Chla values, range 108.03 - 190.58 ug/L, mean 

149.31 ug/L. 14 Chla (corrected) values, range 8.0 - 208.5 ug/L, mean 

105.42 ug/L. vp = No data. EPA believed that a nutrient TMDL was not 

needed. Assessment based on Period of Record data.

09-2007 Lake Griffin 

Unit 2817A HAYNES CREEK REACH STREAM 3F Coliforms Fecal Coliform > 400 per 100 mL Low pp = 8 / 37 Potentially Impaired; vp = 6 / 31, Impaired. EPA established a fecal coliform TMDL on March 31, 2004
Ocklawaha River Basin Group 1 Cycle 2 Assessment/Central District - Verified List Revised and Readopted May 2009

Hydrologic Unit: Ocklawaha River

May 15, 2009 2 of 8 Florida Department of Environmental Protection

OGC Case 

Number Planning Unit WBID Water Segment Name Waterbody Type

Waterbody 

Class1

1998 303(d) 

Parameters of 

Concern

Parameters 

Assessed Using the 

Impaired Waters 

Rule (IWR) pp = 

29/30 Potentially 

Impaired; vp = 

34/37 Impaired. 

Concentration 

Causing 

Impairment

Priority for TMDL 

Development2

Comments 

(# of Exceedances/ # of Samples) 

pp=Planning Period vp=Verified Period3

09-2008 Lake Griffin 

Unit 2825A SILVER LAKE LAKE 3F Nutrients (TSI) TP = 0.03 mg/L Medium

pp = Potentially Impaired. 3 TSI annual means exceeded the threshold. 

Annual means were 48.6 (2001), 47.6 (2002), 39.8 (2003), and 52.9 

(2004). From 2001 to 2004, color annual means were <40. vp = 

Impaired. 3 TSI annual means exceeded the threshold. Annual means 

were 48.6 (2001), 47.6 (2002), and 52.9 (2004). In 2001, 2002 and 

2004, color annual means were <40. 55 Chla (corrected) values, range 

1 - 25.4 ug/L, median 4.27 ug/L. 60 TN values, range 0.9 - 5.804 mg/L, 

median 1.69 mg/L. 64 TP values, range 0.01 - 7.46 mg/L, median 0.03 

mg/L. Limited by phosphorus based on a median TN/TP ratio of 57.0 

(57 values) in the verified period.

09-2009 Lake Harris Unit 2817B LAKE EUSTIS LAKE 3F Dissolved Oxygen < 5.0 mg/L Medium

pp = 45 / 213 Potentially Impaired; vp = 35 / 162 Impaired. DO met the 

verification threshold and TN and BOD were identified as the causative 

pollutants. 156 TN measurements, median 2.20 mg/L. 159 TP 

measurements, median 0.04 mg/L. 10 BOD measurements, median 3.2 

mg/L.

09-2010 Lake Harris Unit

2819A 

(2819 on the 

Consent 

Decree List)

TROUT LAKE LAKE 3F Dissolved Oxygen < 5.0 mg/L Medium

pp = 2 / 9 insufficient data; vp = 8 / 23 Impaired. DO met the verification 

threshold and TN and TP were identified as the causative pollutants. 46 

TN measurements, median 2.44 mg/L. 40 TP measurements, median 

0.24 mg/L. No BOD measurements.

09-2011 Lake Harris Unit 2821B LAKE JOANNA LAKE 3F Nutrients (Historic 

TSI)

TN = 0.69 mg/L 

TP = 0.04 mg/L Medium

pp = Potentially Impaired. 3 TSI annual means increased by more than 

10 units over historical value (20.63 calculated based on TSI data from 

1993 through 1997). Annual means were 21.7 (1995), 25.2 (1998), 26.6 

(1999), 27.2 (2000), 37.5 (2001), 34.7 (2002), 33.6 (2003), and 25.6 

(2004). vp = Impaired. 3 TSI annual means increased by more than 10 

units over historical value. Annual means were 37.5 (2001), 34.7 

(2002), and 33.6 (2003). 45 TN values, median 0.69 mg/L, 47TP 

values, median 0.04 mg/L. The median value of 39 TN/TP ratios is 

about 16, suggesting phosphorus and nitrogen co-limiting.

09-2012 Lake Harris Unit 2831A DORA CANAL STREAM 3F Dissolved Oxygen < 5.0 mg/L Medium

pp = 32 / 81 Potentially Impaired; vp = 46 / 104 Impaired. DO met the 

verification threshold and TN was identified as the causative pollutant. 

136 TN measurements, median 3.37 mg/L. 139 TP measurements, 

median 0.06 mg/L. No BOD measurements.

09-2013 Lake Harris Unit 2832A LAKE DENHAM LAKE 3F Dissolved Oxygen < 5.0 mg/L Medium

pp = 57 / 177 Potentially Impaired; vp = 48 / 132 Impaired. DO met the 

verification threshold and TN and BOD were identified as the causative 

pollutants. 128 TN measurements, median 2.83 mg/L. 16 BOD 

measurements, median 11.05 mg/L. 133 TP measurements, median 0.1 

mg/L. 

09-2014 Lake Harris Unit 2832A LAKE DENHAM LAKE 3F Nutrients (TSI) TN = 2.82 mg/L 

TP = 0.10 mg/L Medium

pp = Potentially Impaired. 7 TSI annual means exceeded the threshold. 

Annual means were 72.5 (1998), 80.1 (1999), 77.8 (2000), 75.1 (2001), 

75.8 (2002), 74.3 (2003), and 69.8 (2004). In 2000, color annual means 

were <40. vp = Impaired. 7 TSI annual means exceeded the threshold. 

Annual means were 77.8 (2000), 75.1 (2001), 75.8 (2002), 74.3 (2003), 

and 69.8 (2004). 104 Chla values, range 1 - 466.6 ug/L, median 62.57 

ug/L. 120 Chla (corrected) values, range 1 - 457.77 ug/L, median 65.85. 

125 TN values, range 1.53 - 6.35 mg/L, median 2.817 mg/L. 130 TP 

values, range 0.052 - 0.28 mg/L, median 0.098 mg/L. Co-limited by 

nitrogen and phosphorus based on a median TN/TP ratio of 29.96 (125 

values) in the verified period.

09-2015 Lake Harris Unit 2838G LAKE HARRIS 

OUTLET STREAM 3F Nutrients 

(Chlorophyll-a) TP = 0.05 mg/L Medium

pp = 3 Chla annual means exceeded 20 ug/L, Potentially Impaired. 

Annual means were 42.98 ug/L (2001), 39.18 ug/L (2002), and 28.4 

ug/L (2003). 36 Chla (corrected) values, range 10.4 - 61.4 ug/L, mean 

34.32 ug/L. vp = 3 Chla annual means exceeded 20 ug/L, Impaired. 

Annual means were 42.98 ug/L (2001), 39.18 ug/L (2002), and 28.4 

ug/L (2003). 36 Chla (corrected) values, range 10.4 - 61.4 ug/L, mean 

32.32 ug/L. 32 TN values, median 1.94 mg/L. 32 TP values, median 

0.05 mg/L. The median value of 27 TN/TP ratio is 36, suggesting 

phosphorus is the limiting nutrient.
Ocklawaha River Basin Group 1 Cycle 2 Assessment/Central District - Verified List Revised and Readopted May 2009

Hydrologic Unit: Ocklawaha River

May 15, 2009 3 of 8 Florida Department of Environmental Protection

OGC Case 

Number Planning Unit WBID Water Segment Name Waterbody Type

Waterbody 

Class1

1998 303(d) 

Parameters of 

Concern

Parameters 

Assessed Using the 

Impaired Waters 

Rule (IWR) pp = 

29/30 Potentially 

Impaired; vp = 

34/37 Impaired. 

Concentration 

Causing 

Impairment

Priority for TMDL 

Development2

Comments 

(# of Exceedances/ # of Samples) 

pp=Planning Period vp=Verified Period3

09-2016 Marshall 

Swamp Unit 2740D OCKLAWAHA RIVER 

ABOVE DAISY STREAM 3F Dissolved Oxygen Dissolved Oxygen < 5.0 mg/L Medium

pp = 163 / 264 Potentially Impaired; vp = 83 / 140 Impaired. DO met the 

verification threshold and TN and BOD were identified as the causative 

pollutants. 130 TN measurements, median 2.52 mg/L. 131 TP 

measurements, median 0.06 mg/L. 15 BOD measurements, median 3.2 

mg/L. The FDEP has drafted a TMDL, which is now pending.

09-2017 Marshall 

Swamp Unit 2740D OCKLAWAHA RIVER 

ABOVE DAISY STREAM 3F

Mercury (Based on 

Fish Consumption 

Advisory)

Mercury (based on 

fish consumption 

advisory)

> DOH threshold 

(>0.3 mg/kg) High*

Data verified to be within the last 7.5 years. Confirmed recent data for 

freshwater fish advisory for Largemouth Bass. 24 Largemouth Bass 

samples, Hg mean concentration was 0.44 mg/Kg in 2003. 

09-2019 Marshall 

Swamp Unit 2740D OCKLAWAHA RIVER 

ABOVE DAISY STREAM 3F Nutrients Nutrients 

(Chlorophyll-a) TP = 0.06 mg/L Medium

pp = 8 Chla annual means exceeded 20 ug/L. Annual mean chla in two 

consecutive years(2000 and 2001) exceeded the historic minimum 

(18.93 ug/L calculated based on data from 1975 - 1979) by more than 

50%, Potentially Impaired. Annual means were 40.14 ug/L (1995), 

24.11 ug/L (1996), 37.44 ug/L (1997), 38.59 ug/L (2000), 38.37 ug/L 

(2001), 15.65 ug/L (2002), 22.13 ug/L (2003), 20.53 ug/L (2004). 192 

Chla (corrected) values, range 1.0 - 268.19 ug/L, mean 33.61 ug/L. vp = 

6 chla annual means exceeded 20 ug/L. Annual means were 38.59 

ug/L (2000), 38.37 ug/L (2001), 15.65 ug/L (2002), 22.13 ug/L (2003), 

20.40 ug/L (2004), 52.78 ug/L (2005), and 41.36 ug/L (2006). 111 Chla 

(corrected) values, range 1.0 - 121.4 ug/L, mean 34.36 ug/L. 130 TN 

values, median 2.52 mg/L. 131 TP values, median 0.057 mg/L. The 

median value of 130 TN/TP ratio is about 41, phosphorus is the limiting 

nutrient. The FDEP has drafted a TMDL, which is now pending.

09-2020 Marshall 

Swamp Unit 2785A SMITH LAKE LAKE 3F

Mercury (based on 

fish consumption 

advisory)

> DOH threshold 

(>0.3 mg/kg) High*

A limited consumption advisory was issued by the DOH. The mercury 

impairment was verified based on results from 8 fishes in the verified 

period . The mean Hg concentration in fish tissue was 0.89 mg/kg.

09-2021 Marshall 

Swamp Unit 2790A LAKE WEIR LAKE 3F Nutrients (TSI) TP = 0.01 mg/L Medium

pp = Potentially Impaired. 1 TSI annual mean exceeded the threshold. 

Annual means were 39.0 (1995), 37.4 (1996), 39.0 (1997), 41.8 (1998), 

31.5 (1999), 31.4 (2000), 32.3 (2001), 31.4 (2002), 27.4 (2003), and 

31.1 (2004). In 1998 the annual mean color was <40. vp = Impaired. 2 

TSI annual means exceeded the threshold. Annual means were 31.4 

(2000), 32.3 (2001), 31.4 (2002), 27.4 (2003), 31.1 (2004), 41.4 (2005), 

and 44.9 (2006). In 2005 and 2006, the annual means of color were 

<40. 26 Chla values, range 7.19 - 14.22 ug/L, median 10.62 ug/L. 91 

Chla (corrected) values, range 1 - 13.83 ug/L, median 1 ug/L. 95 TN 

values, range 0.604 - 1.704 mg/L, median 0.824 mg/L. 94 TP values, 

range 0.004 - 0.023 mg/L, median 0.0138 mg/L. Limited by phosphorus 

based on a median TN/TP ratio of 63.85 (95 values) in the verified 

period.

09-2022 Orange Creek 2688 HATCHET CREEK STREAM 3F Coliforms Fecal Coliform > 400 per 100 mL Low

pp = 16 / 73 Potentially Impaired; vp = 17 / 74, Impaired. Delisted from 

the Consent Decree List in the 1st cycle, assessment but re-listed in the 

2nd assessment cycle.

09-2023 Orange Creek 2688 HATCHET CREEK STREAM 3F Nutrients Nutrients (Historic 

Chlorophyll-a)

TN > 1.43 mg/L 

TP > 0.16 mg/L Medium

pp = Annual mean chla in three consecutive years(2000, 2001, and 

2002) exceeded the historic minimum (3.69 ug/L calculated based on 

data from 1994 - 1998) by more than 50%. Potentially Impaired. Annual 

means were 1.03 ug/L (1996), 5.17 ug/L (1997), 3.90 ug/L (1998), 9.71 

ug/L (1999), 11.71 ug/L (2000), 8.25 ug/L (2001), and 7.39 ug/L (2002). 

119 Chla values, range 1.0 - 56.7 ug/L, mean 9.98 ug/L. 122 Chla 

(corrected) values, range 1.0 - 46.22 ug/L, mean 7.86 ug/L. vp = Annual 

mean chla in three consecutive years(2000, 2001, and 2002) exceeded 

the historic minimum by more than 50%. Impaired. Annual means were 

11.71 ug/L (2000), 8.25 ug/L (2001), and 7.39 ug/L (2002). 85 Chla 

values, range 1.0 - 56.7 ug/L, mean 11.4 ug/L. 88 Chla (corrected) 

values, range 1.0 - 46.22 ug/L, mean 9.39 ug/L. 107 TN values, median 

1.43 mg/L. 113 TP values, median 0.16 mg/L. The median value of 127 

TN/TP ratio is about 10, suggesting phosphorus and nitrogen co-limiting. 

Delisted during the 1st cycle assessment based on Chla concentration. 

Now re-listed based on historic chla concentration.

09-2024 Orange Creek 2695 LITTLE HATCHET 

CREEK STREAM 3F Fecal Coliform > 400 per 100 mL Low pp = 31 / 72, Potentially Impaired; vp = 38 / 83 Impaired
Ocklawaha River Basin Group 1 Cycle 2 Assessment/Central District - Verified List Revised and Readopted May 2009

Hydrologic Unit: Ocklawaha River

May 15, 2009 4 of 8 Florida Department of Environmental Protection

OGC Case 

Number Planning Unit WBID Water Segment Name Waterbody Type

Waterbody 

Class1

1998 303(d) 

Parameters of 

Concern

Parameters 

Assessed Using the 

Impaired Waters 

Rule (IWR) pp = 

29/30 Potentially 

Impaired; vp = 

34/37 Impaired. 

Concentration 

Causing 

Impairment

Priority for TMDL 

Development2

Comments 

(# of Exceedances/ # of Samples) 

pp=Planning Period vp=Verified Period3

09-2025 Orange Creek 2696 POSSUM CREEK STREAM 3F Fecal Coliform > 400 per 100 mL Low pp = 65 / 80 Potentially Impaired; vp = 71 / 93 Impaired

09-2026 Orange Creek 2705A PRAIRIE CREEK STREAM 3F Dissolved Oxygen < 5.0 mg/L Medium

pp = 10 / 71 Potentially Impaired; vp = 25 / 52 Impaired. DO met the 

verification threshold and TN was identified as the causative pollutant. 

48 TN measurements, median 2.31 mg/L. 448 TP measurements, 

median 0.13 mg/L. No BOD measurements.

09-2027 Orange Creek

2705B 

(2705 on the 

Consent 

Decree List)

NEWNANS LAKE LAKE 3F Dissolved Oxygen < 5.0 mg/L Medium

pp = 22 / 314 not Impaired; vp = 25 / 172 Impaired. DO met the 

verification threshold and TN and TP were identified as the causative 

pollutants. 205 TN measurements, median 4.149 mg/L. 211 TP 

measurements, median 0.238 mg/L, No BOD measurements.

09-2028 Orange Creek 2713 LITTLE ORANGE 

CREEK STREAM 3F Fecal Coliform > 400 per 100 mL Low pp = 4 / 7 Potentially Impaired; vp = 10 / 20, Impaired.

09-2029 Orange Creek 2713B REDWATER LAKE LAKE 3F Nutrients (TSI) TN = 1.15 mg/L 

TP = 0.05 mg/L Medium

pp = Not Impaired. 1 TSI annual mean (1995) exceeded the threshold. 

However, in the next 3 consecutive years, annual means did not exceed 

the threshold. Annual means were 66.0 (1995), 57.5 (1996), 59.3 

(1997), and 57.0 (1998). vp = no data. The waterbody was verified for 

nutrient impairment in the 1st cycle assessment. The median value of 5 

TN/TP ratio is about 23, suggesting phosphorus and nitrogen co-limiting. 

The not Impaired assessment call for the planning period was made 

mainly on LakeWatch data. Therefore, the water is still considered 

Impaired.

09-2030 Orange Creek 2718 BEVENS ARM 

OUTLET STREAM 3F Dissolved Oxygen < 5.0 mg/L Medium

pp = 0 / 2 insufficient data; vp = 10 / 14 Impaired. DO met the 

verification threshold and TN and TP were identified as the causative 

pollutants. 16 TN measurements, median 2.21 mg/L. 16 TP 

measurements, median 0.34 mg/L. No BOD measurements.

09-2031 Orange Creek 2718B BEVENS ARM LAKE 3F Nutrients (TSI) TN = 2.68 mg/L 

TP = 0.25 mg/L Medium

pp = Potentially Impaired. 9 TSI annual means exceeded the threshold. 

No TSI annual means increased by more than 10 units over historical 

value (72.35 calculated based on TSI data from 1994 through 1998). 

Annual means were 72.8 (1995), 66.6 (1996), 70.0 (1998), 68.2 (1999), 

81.6 (2000), 78.8 (2001), 71.4 (2002), 79.5 (2003), and 80.3 (2004). vp 

= Impaired. 5 TSI annual means exceeded the threshold. TSI annual 

means increased by more than 10 units over historical value in 4 years. 

Annual means were 81.6 (2000), 78.8 (2001), 71.4 (2002), 79.5 (2003), 

and 72.9 (2004). 52 chla values, range 2.30 - 428.35 ug/L, median 84.9 

ug/L. 54 chla (corrected) values, range 1 - 466.6 ug/L, median 87.41. 

65 TN values, range 0.2 - 6.107 mg/L, median 2.68 mg/L. 72 TP values, 

range 0.1 - 0.53 mg/L, median 0.25 mg/L. Co-limited by nitrogen and 

phosphorus based on a median TN/TP ratio of 12.31 (65 values) in the 

verified period.

09-2032 Orange Creek 2718B BEVENS ARM LAKE 3F Turbidity >29 NTUs above 

background Medium pp = 31 / 96, Potentially Impaired; vp = 40 / 84 Impaired

09-2033 Orange Creek 2720 ALACHUA SINK 

OUTLET STREAM 3F Dissolved Oxygen < 5.0 mg/L Medium

pp = 2 / 2 insufficient data ; vp = 9 / 9 Impaired. DO met the verification 

threshold and TN was identified as the causative pollutant. 15 TN 

measurements, median 2.00 mg/L. 14 TP measurements, median 0.10 

mg/L. 1 BOD measurement, 2.6 mg/L.

09-2034 Orange Creek 2720 ALACHUA SINK 

OUTLET STREAM 3F Fecal Coliform > 400 per 100 mL Low pp = 3 / 9, Potentially Impaired; vp = 5 / 18 Impaired

09-2035 Orange Creek

2720A 

(2720 on the 

Consent 

Decree List)

ALACHUA SINK LAKE 3F Fecal Coliform > 400 per 100 mL Low pp = 8 / 26 Potentially Impaired; vp = 8 / 27 Impaired.

09-2036 Orange Creek 2723A COWPEN LAKE LAKE 3F

Mercury (based on 

fish consumption 

advisory)

> DOH threshold 

(>0.3 mg/kg) High*

Data verified to be within the last 7.5 years. Confirmed recent data for 

freshwater fish advisory for Bluegill. 12 Bluegill samples, Hg mean 

concentration was 0.45 mg/Kg in 2003. 

09-2037 Orange Creek 2733 CAMPS CANAL 

REACH STREAM 3F Dissolved Oxygen < 5.0 mg/L Medium

pp = 12 / 14 Potentially Impaired ; vp = 38 / 44 Impaired. DO met the 

verification threshold and TN was identified as the causative pollutant. 

44 TN measurements, median 1.99 mg/L. 44 TP measurements, 

median 0.12 mg/L. No BOD measurements.
Ocklawaha River Basin Group 1 Cycle 2 Assessment/Central District - Verified List Revised and Readopted May 2009

Hydrologic Unit: Ocklawaha River

May 15, 2009 5 of 8 Florida Department of Environmental Protection

OGC Case 

Number Planning Unit WBID Water Segment Name Waterbody Type

Waterbody 

Class1

1998 303(d) 

Parameters of 

Concern

Parameters 

Assessed Using the 

Impaired Waters 

Rule (IWR) pp = 

29/30 Potentially 

Impaired; vp = 

34/37 Impaired. 

Concentration 

Causing 

Impairment

Priority for TMDL 

Development2

Comments 

(# of Exceedances/ # of Samples) 

pp=Planning Period vp=Verified Period3

09-2038 Orange Creek 2738 LOCHLOOSA LAKE 

OUTLET STREAM 3F Nutrients Nutrients 

(Chlorophyll-a) N/A Medium

pp = Four Chla annual mean values exceeded 20 ug/L. Annual means 

were 64.93 ug/L (1996), 50.58 ug/L (1997) 94.67 ug/L (1998), and 115.8 

ug/L (1999). 13 Chla values, range 18.30 - 152.66 ug/L, mean 64.88 

ug/L. 32 Chla (corrected) values, range 1.0 - 227.5 ug/L, mean 73.88 

ug/L. vp = Insufficient data to calculate any annual mean. 8 Chla 

(corrected) values, range 1.0 - 227.5 ug/L, mean 60.14 ug/L. 78 TN 

values, median 1.24 mg/L. 79 TP values, median 0.08 mg/L. 

Assessment based on Period of Record data.

09-2039 Orange Creek

2738A 

(2738 on the 

Consent 

Decree List)

LOCHLOOSA LAKE LAKE 3F Nutrients Nutrients (TSI) TN = 1.72 mg/L 

TP = 0.09 mg/L Medium

pp = Potentially Impaired. 8 TSI annual means exceeded the threshold. 

7 TSI annual means increased by more than 10 units over historical 

value (54.2 calculated based on TSI data from 1986 through 1990). 

Annual means were 64.6 (1995), 65.9 (1996), 69.2 (1997), 76.9 (1998), 

84.7 (1999), 88.5 (2000), 84.4 (2001), 56.4 (2003), and 61.1 (2004). vp 

= Impaired. 4 TSI annual means exceeded the threshold. 3 TSI annual 

means increased by more than 10 units over historical value. Annual 

means were 88.5 (2000), 84.4 (2001), 56.4 (2003), 61.1 (2004), 56.6 

(2005), and 64.6 (2006). 102 chla values, range 1 - 207.12 ug/L, 

median 24.05 ug/L. 114 chla (corrected) values, range 1 - 285.2 ug/L, 

median 22.04 ug/L. 136 TN values, range 1.11 - 7.57 mg/L, median 

1.72 mg/L. 138 TP values, range 0.029 - 0.203 mg/L, median 0.087 

mg/L. Co-limited by nitrogen and phosphorus based on a median TN/TP 

ratio of 29.57 (135 values) in the verified period. The FDEP has drafted 

a TMDL, which is now pending. 

09-2040 Orange Creek 2744 RIVER STYX REACH STREAM 3F Dissolved Oxygen < 5.0 mg/L Medium

pp = 27 / 28 Potentially Impaired; vp = 54 / 54 Impaired. DO met the 

verification threshold and TN, TP, and BOD were identified as the 

causative pollutants. 55 TN measurements, median 2.10 mg/L. 55 TP 

measurements, median 0.27 mg/L. 10 BOD measurements, median 

2.15 mg/L.

09-2041 Orange Creek 2747 ORANGE CREEK STREAM 3F Dissolved Oxygen < 5.0 mg/L Medium

pp = 37 / 173 Potentially Impaired; vp = 87 / 160 Impaired. DO met the 

verification threshold and TN was identified as the causative pollutant. 

141 TN measurements, median 2.02 mg/L. 143 TP measurements, 

median 0.16 mg/L. 6 BOD measurements, median 0.6 mg/L.

09-2042 Orange Creek 2749 ORANGE LAKE 

REACH LAKE 3F Dissolved Oxygen < 5.0 mg/L Medium

pp = 3 / 10 Potentially Impaired; vp = 19 / 23 Impaired. DO met the 

verification threshold and TP was identified as the causative pollutant. 

20 TP measurements, median 0.19 mg/L 20 TN measurements, median 

1.57 mg/L. 10 BOD measurements, median 0.7 mg/L, 

09-2043 Orange Creek

2749A 

(2749 on the 

Consent 

Decree List)

ORANGE LAKE LAKE 3F Dissolved Oxygen Dissolved Oxygen < 5.0 mg/L Medium

pp = 76 / 263 Potentially Impaired; vp = 48 / 167 Impaired. DO met the 

verification threshold and TN and TP were identified as the causative 

pollutants. 160 TN measurements, median 1.89 mg/L. 164 TP 

measurements, median 0.15 mg/L. No BOD measurements. Delisted 

from the Consent Decree list in the 1st assessment cycle but re-listed in 

the 2nd cycle.

09-2044 Orange Creek 2754 CROSS CREEK STREAM 3F Dissolved Oxygen Dissolved Oxygen < 5.0 mg/L Medium

pp = 35 / 56 Potentially Impaired; vp = 22 / 45 Impaired. DO met the 

verification threshold, but unable to determine the causative pollutants. 

44 TN values, median 1.52 mg/L. 44 TP values, median 0.11 mg/L. No 

BOD observations. The FDEP has drafted a TMDL, which is now 

pending.

09-2045 Orange Creek 2754 CROSS CREEK STREAM 3F Nutrients Nutrients 

(Chlorophyll-a)

TN = 1.52 mg/L 

TP = 0.10 mg/L Medium

pp = 3 Chla annual mean values exceeded 20 ug/L, Potentially 

Impaired. Annual means were 25.61 ug/L (1995), 27.57 ug/L (1996), 

and 35.35 ug/L (1997). 37 Chla values, range 12.84 - 88.17 ug/L, mean 

37.61 ug/L. 36 Chla (corrected) values, range 10.96 - 86.87 ug/L, mean 

32.45 ug/L. vp = No data. 40 TN values, median 1.52 mg/L. 40 TP 

values, median 0.1 mg/L. The median value of 45 TN/TP ratio is about 

14, suggesting phosphorus and nitrogen are colimiting nutrients. The 

FDEP has drafted a TMDL, which is now pending.
Ocklawaha River Basin Group 1 Cycle 2 Assessment/Central District - Verified List Revised and Readopted May 2009

Hydrologic Unit: Ocklawaha River

May 15, 2009 6 of 8 Florida Department of Environmental Protection

OGC Case 

Number Planning Unit WBID Water Segment Name Waterbody Type

Waterbody 

Class1

1998 303(d) 

Parameters of 

Concern

Parameters 

Assessed Using the 

Impaired Waters 

Rule (IWR) pp = 

29/30 Potentially 

Impaired; vp = 

34/37 Impaired. 

Concentration 

Causing 

Impairment

Priority for TMDL 

Development2

Comments 

(# of Exceedances/ # of Samples) 

pp=Planning Period vp=Verified Period3

09-2046 Palatlakaha 

River 1406 BIG CREEK REACH STREAM 3F Dissolved Oxygen < 5.0 mg/L Medium

pp = 19 / 31 Potentially Impaired; vp = 24 / 25 Impaired. DO met the 

verification threshold and TN was identified as the causative pollutant. 

11 TN measurements, median 2.04 mg/L. 15 TP measurements, median 

0.05 mg/L, 11 BOD measurements, median 0.8 mg/L.

09-2047 Palatlakaha 

River 2839A LAKE MINNEOLA LAKE 3F

Mercury (based on 

fish consumption 

advisory)

> DOH threshold 

(>0.3 mg/kg) High*

Data verified to be within the last 7.5 years. Confirmed recent data for 

freshwater fish advisory for Largemouth Bass. 13 Largemouth Bass 

samples, Hg mean concentration was 0.57 mg/Kg in 2000-2003. 

09-2048 Palatlakaha 

River 2839D LAKE CHERRY LAKE 3F

Mercury (based on 

fish consumption 

advisory)

> DOH threshold 

(>0.3 mg/kg) High*

Data verified to be within the last 7.5 years. Confirmed recent data for 

freshwater fish advisory for Largemouth Bass. 12 Largemouth Bass 

samples, Hg mean concentration was 0.55 mg/Kg in 2002. 

09-2049 Palatlakaha 

River 2839D LAKE CHERRY LAKE 3F Nutrients (Historic 

TSI) TP = 0.02 mg/L Medium

pp = Potentially Impaired. 1 TSI annual mean increased by more than 

10 units over historical value (30.92 calculated based on TSI data from 

1988 through 1992). Annual means were 29.4 (1995), 34.7 (1996), 33.6 

(1998), 33.1 (1999), 32.9 (2000), 33.4 (2001), 30.9 (2002), 41.1 (2003), 

and 37.7 (2004). vp = Impaired. 3 TSI annual means increased by 

more than 10 units over historical value. Annual means were 32.9 

(2000), 33.4 (2001), 30.9 (2002), 41.1 (2003), 37.7 (2004), 44.1 (2005), 

and 44.9 (2006). 93 TN values, median 0.904 mg/L. 94 TP values, 

median 0.022 mg/L. The median value of 92 TN/TP ratios is about 44, 

suggesting phosphorus is the limiting nutrient.

09-2050 Palatlakaha 

River 2839M LAKE LOUISA LAKE 3F Dissolved Oxygen < 5.0 mg/L Medium

pp = 5 / 38 not Impaired; vp = 5 / 19 Impaired. DO met the verification 

threshold and TN was identified as the causative pollutant. 19 TN 

measurements, median 1.97 mg/L. 21 TP measurements, median 0.06 

mg/L. 4 BOD measurements, median 0.42 mg/L.

09-2051 Palatlakaha 

River 2839M LAKE LOUISA LAKE 3F

Mercury (based on 

fish consumption 

advisory)

> DOH threshold 

(>0.3 mg/kg) High*

Data verified to be within the last 7.5 years. Confirmed recent data for 

freshwater fish advisory for White Catfish. 12 White Catfish samples, 

Hg mean concentration was 0.56 mg/Kg in 2005. 

09-2052 Palatlakaha 

River 2839N LAKE MINNEHAHA LAKE 3F

Mercury (based on 

fish consumption 

advisory)

> DOH threshold 

(>0.3 mg/kg) High*

Data verified to be within the last 7.5 years. Confirmed recent data for 

freshwater fish advisory for Largemouth Bass. 12 Largemouth Bass 

samples, Hg mean concentration was 1.28 mg/Kg in 2005. 

09-2053 Palatlakaha 

River 2883 LITTLE CREEK STREAM 3F Dissolved Oxygen < 5.0 mg/L Medium

pp = 23 / 29 Potentially Impaired; vp = 13 / 14 Impaired. DO met the 

verification threshold and TN was identified as the causative pollutant. 

11 TN measurements, median 2.73 mg/L. 14 TP measurements, 

median 0.12 mg/L. 5 BOD measurements, median 1.0 mg/L.

09-2054 Rodman 

Reservoir Unit 2740A

OCKLAWAHA RIVER 

ABOVE STJOHNS 

RIVER

STREAM 3F

Mercury (Based on 

Fish Consumption 

Advisory)

Mercury (based on 

fish consumption 

advisory)

> DOH threshold 

(>0.3 mg/kg) High*

Data verified to be within the last 7.5 years. Confirmed recent data for 

freshwater fish advisory for Largemouth Bass. 24 Largemouth Bass 

samples, Hg mean concentration was 0.44 mg/Kg in 2003. 

09-2055 Rodman 

Reservoir Unit 2740B LAKE OCKLAWAHA LAKE 3F

Mercury (Based on 

Fish Consumption 

Advisory)

Mercury (based on 

fish consumption 

advisory)

> DOH threshold 

(>0.3 mg/kg) High*

Data verified to be within the last 7.5 years. Confirmed recent data for 

freshwater fish advisory for Largemouth Bass. 24 Largemouth Bass 

samples, Hg mean concentration was 0.44 mg/Kg in 2003. 

09-2056 Rodman 

Reservoir Unit 2740C

OCKLAWAHA RIVER 

ABOVE LAKE 

OCKLAWAHA

STREAM 3F Dissolved Oxygen Dissolved Oxygen < 5.0 mg/L Medium

pp = 102 / 296 Potentially Impaired; vp = 88 / 206 Impaired. DO met the 

verification threshold, but unable to determine the causative pollutants. 

189 TN values, median 1.20 mg/L. 193 TP values, median 0.05 mg/L. 

3 BOD observations, median 2.1 mg/L. The FDEP has drafted a TMDL, 

which is now pending.

09-2057 Rodman 

Reservoir Unit 2740C

OCKLAWAHA RIVER 

ABOVE LAKE 

OCKLAWAHA

STREAM 3F

Mercury (Based on 

Fish Consumption 

Advisory)

Mercury (based on 

fish consumption 

advisory)

> DOH threshold 

(>0.3 mg/kg) High*

Data verified to be within the last 7.5 years. Confirmed recent data for 

freshwater fish advisory for Largemouth Bass. 24 Largemouth Bass 

samples, Hg mean concentration was 0.44 mg/Kg in 2003. 
Ocklawaha River Basin Group 1 Cycle 2 Assessment/Central District - Verified List Revised and Readopted May 2009

Hydrologic Unit: Ocklawaha River

May 15, 2009 7 of 8 Florida Department of Environmental Protection

OGC Case 

Number Planning Unit WBID Water Segment Name Waterbody Type

Waterbody 

Class1

1998 303(d) 

Parameters of 

Concern

Parameters 

Assessed Using the 

Impaired Waters 

Rule (IWR) pp = 

29/30 Potentially 

Impaired; vp = 

34/37 Impaired. 

Concentration 

Causing 

Impairment

Priority for TMDL 

Development2

Comments 

(# of Exceedances/ # of Samples) 

pp=Planning Period vp=Verified Period3

09-2058 Rodman 

Reservoir Unit 2740C

OCKLAWAHA RIVER 

ABOVE LAKE 

OCKLAWAHA

STREAM 3F Nutrients Nutrients (Historic 

Chlorophyll-a)

TN = 1.20 mg/L 

TP = 0.05 mg/L Medium

pp = Annual mean chla in three consecutive years(1998, 1999, and 

2000) exceeded the historic minimum (2.02 ug/L calculated based on 

data from 1977 - 1981) by more than 50%, Potentially Impaired. Annual 

means were 1.94 ug/L (1995), 6.87 ug/L (1996), 2.55 ug/L (1997), 6.24 

ug/L (1998), 3.20 ug/L (1999), 6.66 ug/L (2000), 2.01 ug/L (2001), 1.15 

ug/L (2002), 3.24 ug/L (2003), and 1.86 ug/L (2004). 216 Chla 

(corrected) values, range 1.0 - 94.0 ug/L, mean 4.01 ug/L. vp = Annual 

mean Chla in two consecutive years (2005 and 2006) exceeded the 

historic minimum by more than 50%., Impaired. Annual means were 

6.66 ug/L (2000), 2.01 ug/L (2001), 1.15 ug/L (2002), 3.24 ug/L (2003), 

1.86 ug/L (2004), 6.59 ug/L (2005), and 3.64 ug/L (2006). 184 Chla 

(corrected) values, range 1.0 - 94.0 ug/L, mean 4.17 ug/L. 189 TN 

values, median 1.2 mg/L. 193 TP values, median 0.045 mg/L. The 

median value of 191 TN/TP ratios is about 28, suggesting phosphorus 

and nitrogen co-limiting. The FDEP has drafted a TMDL, which is now 

pending.

09-2059 Rodman 

Reservoir Unit 2769 DAISY CREEK STREAM 3F Chlorine ≤ 0.01 mg/L Medium pp = 8 / 8 Potentially Impaired; vp = 8 / 8 Impaired

09-2060 Rodman 

Reservoir Unit 2769 DAISY CREEK STREAM 3F Dissolved Oxygen Dissolved Oxygen < 5.0 mg/L Medium

pp = 14 / 18 Potentially Impaired; vp = 14 / 22 Impaired. DO met the 

verification threshold and TN was identified as the causative pollutant. 

13 TN measurements, median 1.73 mg/L. 14 TP measurements, 

median 0.22 mg/L. 4 BOD measurements, median 0.7 mg/L. EPA 

believed a DO TMDL was not needed for this waterbody.

09-2061 Rodman 

Reservoir Unit 2769 DAISY CREEK STREAM 3F Lead > e(1.273 [lnH] - 4.705); Medium pp = 9 / 9 Potentially Impaired; vp = 11 / 13 Impaired

09-2062 Rodman 

Reservoir Unit 2771A LAKE EATON LAKE 3F Dissolved Oxygen < 5.0 mg/L Medium

pp = 1 / 1 Insufficient Data; vp = 7 / 9 Impaired. DO met the verification 

threshold and TN and TP was identified as the causative pollutant. 5 TN 

measurements, median 1.76 mg/L. 5 TP measurements, median 0.12 

mg/L. No BOD measurements.

09-2063 Rodman 

Reservoir Unit 2771A LAKE EATON LAKE 3F

Mercury (based on 

fish consumption 

advisory)

> DOH threshold 

(>0.3 mg/kg) High* Data verified to be within the last 7.5 years. 12 Largemouth Bass 

samples, Hg mean concentration was 0.40 mg/Kg in 2004. 

09-2064 Rodman 

Reservoir Unit 2779A MILL DAM LAKE LAKE 3F

Mercury (based on 

fish consumption 

advisory)

> DOH threshold 

(>0.3 mg/kg) High*

A limited consumption advisory was issued by the DOH. The mercury 

impairment was verified based on results from 10 fishes in the verified 

period. The mean Hg concentration in fish tissue was 1.09 mg/kg in 

2000.

09-2065 Rodman 

Reservoir Unit 2782C LAKE BRYANT LAKE 3F

Mercury (based on 

fish consumption 

advisory)

> DOH threshold 

(>0.3 mg/kg) High* Data verified to be within the last 7.5 years. 15 Largemouth Bass 

samples, Hg mean concentration was 0.36 mg/Kg in 2003 and 2004. 

09-2066 Marshall 

Swamp Unit 2772A Silver Springs SPRING 3F Nutrients (Algal 

Mats) Nitrate+Nitrite > 0.60 Medium

The Groundwater Protection Section determined this waterbody has 

median Nitrate+Nitrite concentration > 0.60 mg/L and abundant algal 

mats such that the flora is imbalanced.

09-2068 Marshall 

Swamp Unit 2772A Silver Springs SPRING 3F Nutrients (Algal 

Mats) Nitrate+Nitrite > 0.60 Medium

The Groundwater Protection Section determined this waterbody has 

median Nitrate+Nitrite concentration > 0.60 mg/L and abundant algal 

mats such that the flora is imbalanced.

09-2069 Marshall 

Swamp Unit 2772C Silver Springs Group SPRING 3F Nutrients (Algal 

Mats) Nitrate+Nitrite > 0.60 Medium

The Groundwater Protection Section determined this waterbody has 

median Nitrate+Nitrite concentration > 0.60 mg/L and abundant algal 

mats such that the flora is imbalanced.

09-2070 Marshall 

Swamp Unit 2772E Silver River Upper SPRING 3F Nutrients (Algal 

Mats) Nitrate+Nitrite > 0.60 Medium

The Groundwater Protection Section determined this waterbody has 

median Nitrate+Nitrite concentration > 0.60 mg/L and abundant algal 

mats such that the flora is imbalanced.

09-2071 Rodman 

Reservoir Unit 2782C LAKE BRYANT LAKE 3F Nutrients (TSI) TP = 0.03 mg/L Medium

pp = Potentially Impaired. 1 TSI annual mean exceeded the threshold. 

Annual means were 63.1 (1995), 49.5 (1996), and 49.9 (1997). vp = 

Insufficient data to calculate any annual mean. 2 TN values, median 

1.36. 5 TP values, median 0.027. The median value of 116 TN/TP 

ratios is about 48, suggesting phosphorus is the limiting nutrient. The 

waterbody was listed in the 1st cycle assessment for nutrient 

impairment.

1 Florida's water body classifications are defined as: 1 - Potable water supplies, 2 - Shellfish propagation or harvesting, 3F - Recreation, propagation, and maintenance of a healthily, well-balanced population of fish and wildlife in fresh water, 3M - Recreation, 

propagation, and maintenance of a healthily, well-balanced population of fish and wildlife in marine water, 4 - Agricultural water supplies, 5 - Navigation, utility, and industrial use.
Ocklawaha River Basin Group 1 Cycle 2 Assessment/Central District - Verified List Revised and Readopted May 2009

Hydrologic Unit: Ocklawaha River

May 15, 2009 8 of 8 Florida Department of Environmental Protection

OGC Case 

Number Planning Unit WBID Water Segment Name Waterbody Type

Waterbody 

Class1

1998 303(d) 

Parameters of 

Concern

Parameters 

Assessed Using the 

Impaired Waters 

Rule (IWR) pp = 

29/30 Potentially 

Impaired; vp = 

34/37 Impaired. 

Concentration 

Causing 

Impairment

Priority for TMDL 

Development2

Comments 

(# of Exceedances/ # of Samples) 

pp=Planning Period vp=Verified Period3

2

 Where a parameter was 1998 303(d) listed, the priority for TMDL development is the year provided and is assigned based on the consent decree schedule.

 Where a parameter was only identified as impaired under the IWR, a priority of “medium” was assigned. Exceptions are waters where the impairment poses a threat to potable water or 

 human health, which have been assigned a “high” priority, and fecal coliform impairments, which have been assigned a “low” priority.

 All other listings as of this cycle are prioritized based on the following:

 it is the Department's intent that listings with a "High" priority be addressed within the next 5 years, listings with a "Medium" priority be addressed within 5-10 years as resources allow,

 and listings with a "Low" priority be addressed within the next 10 years.

3

 PP - Planning Period (January, 1995 through December, 2004); VP - Verified Period (January, 2000 through June 30, 2007)

*

 A statewide TMDL for mercury, that will address this waterbody, is scheduled to be completed in 2012.

The Group 1 second cycle Ocklawaha River Basin Verified List is based on IWR Run_31