Florida State Road 666

State Road 666 (SR 666) is a short state road in Pinellas County. Locally known as Tom Stuart Causeway, the route crosses Boca Ceiga Bay from Seminole to Madeira Beach. The bridge crossing Boca Ceiga Bay is a Bascule Drawbridge with 11 spans. The route ends with an interchange with Alternate US 19 in Bay Pines(originally built for the formerly proposed Pinellas Belt Expressway). The southwestern terminus of the route is at State Road 699 in Madeira Beach, in front of the Ocean Sands hotel.