Middle St. Johns - Florida Department of Environmental Protection

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Water Quality Assessment Report: Middle St. Johns
Water Quality Improvement Plans and Projects
Appendix C summarizes restoration and protection efforts in the
basin, by planning unit.
Waters will not be placed on the Verified List if the Department
receives reasonable assurance that existing or proposed projects and/or programs
are expected to result in the attainment of water quality standards or
consistently improve water quality over time. Chapter 4 and Appendix D
contain additional information on the requirements for reasonable
assurance.
For this planning unit, no management plans or projects complying
with the Department’s guidance for reasonable assurance have been provided
for the 2002 list of impaired waters.
• Lake Monroe Planning Unit
General Description
The Lake Monroe planning unit lies within northwestern Seminole
and southwestern Volusia Counties. Its main waterbody is Lake Monroe.
One of the 3 major lakes in the Middle St. Johns Basin, Lake Monroe is
6 miles long, 4 miles wide, and on average 7 feet deep. Covering approximately
11 percent of the planning unit’s total area, the lake’s total size is
9,406 acres (URS, 2001). Classified as a “river run” lake, Lake Monroe
consists of an enlargement of the St. Johns River that the river runs
through. Major tributaries include Bethel Creek and the DeBary Drain
(SJRWMD, 2002a). Other waterbodies include various segments of the
St. Johns River and the northernmost portion of Lake Jesup, which is
separated from the main body of the lake by a built-up causeway. Its water
quality is distinctly different from the rest of Lake Jesup.
Water Quality Summary
Figure 3.9, 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 105 sampling stations were used for
assessment (Appendix F).
Table 3.11 summarizes the water quality assessment status of all waterbody
segments in the planning unit.
Of the 52 waterbody segments in the Lake Monroe planning unit,
21 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. Twenty segments have sufficient data for assessment,
and of these, 8 are verified impaired for at least 1 parameter assessed,
none are on the Planning List as potentially impaired, and 12 meet
standards for parameters assessed.