The study corridor and surrounding region is located within the Fisheating Creek, Indian Prairie, and Lake Istokpoga subwatersheds of the Lake Okeechobee watershed. It traverses 21 Florida Department of Environmental Protection (FDEP) Waterbody ID (WBID) sub-basins; out of which, six WBIDs are listed as verified impaired at the time of this report. The study relevant WBIDs are summarized in Table 3. The existing US 27 corridor along the study limits also falls within the Lake Okeechobee Basin Management Action Plan (BMAP). The study corridor does not discharge to any Outstanding Florida Waters (OFW) or Outstanding Florida Springs (OFS).
Table 3: Summary of WBIDs and Impairment Status
| WBID | Name | Impairment |
|---|---|---|
| 3201J | Gopher Gully | n/a |
| 3201B | Gator Slough | n/a |
| 3204 | Harney Pond Canal | Dissolved Oxygen, Nutrients |
| 1932 | Grassy Creek | Nutrients |
| 1932I | Buck Lake | Nutrients |
| 1932A | Lake Grassy | n/a |
| 1932N | Little Lake Grassy | n/a |
| 1938Y | Lake Placid Outlet | Dissolved Oxygen, Metal |
| 1932K | Lake McCoy | n/a |
| 1938Z | Lake June in Winter Drain | n/a |
| 1938M | Unnamed "E" Lake | n/a |
| 1860A | Josephine Creek | Nutrients |
| 1860C | Jackson Creek | Nutrients |
| 1891 | Yellow Bluff Creek | n/a |
| 1860D | Lake Jackson | n/a |
| 1860G | Little Lake Jackson | n/a |
| 1842C | Lake Sebring Outlet | n/a |
| 1831R | Lake Letta Outlet | n/a |
| 1813I | Lake Anoka | n/a |
| 1758K | Lake Damon Outlet | n/a |
| 1730F | Lake Livingston Drain | n/a |
Based on the straight-line diagrams, there are six bridges over waterbodies, one bridge culvert, and 84 cross drains within the study limits. The existing cross culverts are summarized in Table 4.
US 27 traverses Federal Emergency Management Agency (FEMA) identified regulatory floodplains around Josephine Creek. FEMA-identified 100-year floodplains are illustrated in Figure 13, which is based upon the National Flood Hazard Layer (NFHL) from the effective Flood Insurance Rate Maps (FIRMs) dated November 18, 2015.
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