Florida State Road 666

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State Road 666 marker

State Road 666
Tom Stuart Causeway / 150th Avenue
Route information
Maintained by FDOT
Length: 1.391 mi[1] (2.239 km)
Major junctions
West end: SR 699 in Madeira Beach
East end:
US 19 Alt. in Seminole
Highway system
SR 659 SR 674

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.

Major intersections[edit]

The entire route is in Pinellas County.

Location mi[1] km Destinations Notes
Madeira Beach 0.000 0.000 SR 699 (Gulf Boulevard) – Redington Beaches
Tom Stuart Causeway over Boca Ciega Bay (Gulf Intracoastal Waterway)
0.887 1.427 Duhme Road (CR 321 north)
Seminole 1.2 1.9 Exit to school (EB only)
1.391 2.239
US 19 Alt. (SR 595) – Seminole, Clearwater, St. Petersburg
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ a b FDOT straight line diagrams Archived March 6, 2014, at the Wayback Machine., accessed March 2014