Middle St. Johns - Florida Department of Environmental Protection

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128 Water Quality Assessment Report: Middle St. Johns • Lake Woodruff Planning Unit General Description Volusia and Lake Counties bisect the Lake Woodruff planning unit, which drains 176,782 acres (276 square miles). Major waterbodies include Lake Woodruff and Lake Dexter. In the planning unit, the St. Johns River extends through Beresford Lake, Lake Woodruff, and Lake Dexter (URS, 2001). The St. Johns River makes up the western border of the 21,500- acre (33.5-square-mile) Lake Woodruff National Wildlife Refuge (West Volusia Audubon Society, 2001), which is completely contained within the planning unit. The typical landscape comprises freshwater marshland and swamp bordering the St. Johns River (U.S. Fish and Wildlife Service, 1997). Water Quality Summary Figure 3.10, a composite map of the planning unit, shows waters on the 1998 303(d) list, the Planning List and Verified List, and potential pollution sources. Water quality data from 42 sampling stations were used for assessment (Appendix F). Table 3.12 summarizes the water quality assessment status of all waterbody segments in the planning unit. Of the 34 waterbody segments in the Lake Woodruff planning unit, 11 have at least some type of data in the planning and/or verification periods, but in many cases the data are insufficient for assessment of segments under the IWR. Seven segments have sufficient data for assessment, and of these, 1 is verified impaired for at least 1 parameter assessed, 3 meet the threshold of impaired for DO but not by a specific pollutant, 2 remain on the Planning List as only potentially impaired, and 1 meets standards for all parameters assessed. Listed below is the verified impaired segment in the planning unit, with the parameter for which it is impaired. Lake Beresford Nutrients (TSI) Other potential impairments in the planning unit include 3 waterbodies are potentially impaired for DO, 3 are potentially impaired for Biology, and 1 for selenium. According to the data, the majority of impairments, by mileage, are in the planning unit’s streams. However, Lake Beresford is impaired for nutrients, and Lake Woodruff is potentially impaired for DO. Volusia Blue Spring is listed as impaired for nutrients on the 1998 303(d) list (the only spring on the 303[d] list in the planning unit). The nitrate-nitrite concentrations increased from 0.11 milligrams per liter (mg/L) to 0.264 mg/L between October 2000 and March 2001. Volusia Blue Spring received a SCI rating of 15 in October 2000 and a rating of 17 in March 2001; both ratings are in the “poor” range (Department, 2000–2001).
Water Quality Assessment Report: Middle St. Johns 129 Figure 3.10: Composite Map of the Lake Woodruff Planning Unit, Including the 1998 303(d) List, Planning List and Verified List Waters, and Potential Pollution Sources
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Middle St. Johns - Florida Department of Environmental Protection

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