The Kissimmee River does not naturally flow directly into Lake Okeechobee. Instead, they're linked by the Kissimmee–Okeechobee–Everglades (KOE) water management system:
Flood control, water supply, Everglades restoration, estuary health. The system is actively operated by South Florida Water Management District (SFWMD) and USACE.
Direct connection? No. Engineered connection? Yes—highly regulated.