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, it crosses a lagoon from Seminole to Madeira Beach. The bridge has 11 spans, the longest span is in the middle, where the boats go across. It is called a bascule bridge, carrying 4 lanes of SR 666. As a Directional T interchange, its northeastern terminus is Alternate US 19 in Bay Pines(originally built for the formerly proposed Pinellas Belt Expressway), and with a regular intersection, its southwestern terminus 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 1.391 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, accessed March 2014