Following 150th Avenue and Madeira Beach Causeway, State Road 666 is a 1.39 mile long route between SR 699 (Gulf Boulevard) and U.S. 19 Alternate. The four lane boulevard spans the Gulf Intracoastal Waterway across a bascule bridge and ties into Bay Pines Boulevard and Seminole Seminole Boulevard at a three-wye interchange on the Seminole city line at Bay Pines. Historically SR 666 was designated as an eastern branch of SR 699.
State Road 666 as State Road 699 along Madeira Beach Causeway in 1975.
 East |
 | A confirming marker for SR 666 stands along 150th Avenue just beyond the intersection with SR 699 (Gulf Boulevard). 150th Avenue constitutes a commercial strip to Boca Ciega Bay. 05/06/17 |
 | Madeira Way angles between SR 666 and SR 699 through the Madeira Beach business district. 08/15/15 |
 | Seminole and St. Petersburg lie beyond the east end of SR 666 along U.S. 19 Alternate. 10/01/16 |
  | Several marinas line Tom Stuart Causeway leading to the Intracoastal Waterway bridge across Boca Ciega Bay. 08/15/15 |
  | The four lane draw bridge across the Gulf Intracoastal Waterway was built in 1962. 08/15/15 |
 | SR 666 intersects Duhme Road (CR 321) just east of Boca Ciega Bay. CR 321 follows Duhme Road and 113th Street N (New Bridge Road) north into Seminole. 08/15/15 |
 | SR 666 east expands to three lanes from Duhme Road to the exchange with U.S. 19 Alternate (Seminole Boulevard). Built in 1974, a pedestrian bridge spans 150th Avenue / Tom Stuart Causeway to Madeira Beach Elementary School. 05/06/17 |
 | Two lanes separate for both directions of U.S. 19 Alternate at the city of Seminole. 08/15/15 |
 | The three-wye interchange between SR 666 and U.S. 19 Alternate (SR 595) was built in anticipation of canceled plans involving an expressway through Seminole and Largo. 08/15/15 |
 | The ramp to northbound U.S. 19 Alternate joins the left side of Seminole Boulevard north ahead of 54th Avenue N. U.S. 19 ALT constitutes a commercial arterial north to SR 60 in the city of Clearwater. 08/15/15 |
 | The ramp from SR 666 east to U.S. 19 Alternate south joins the left side of Bay Pines Boulevard ahead of 100th Way N. The Bay Pines VA Medical Center lies south of U.S. 19 ALT and east to 95th Street N. 05/06/17 |
| West |
 | A left exit ramp with two lanes links U.S. 19 ALT (Seminole Boulevard) south with SR 666 (Tom Stuart Causeway) west. 08/15/15 |
 | Two lanes join SR 666 from U.S. 19 ALT below a pedestrian bridge serving two adjacent schools. There are no reassurance markers for SR 666 posted along 150th Avenue / Tom Stuart Causeway westbound. 08/15/15 |
 | Duhme Road arcs northwest from SR 666 (Madeira Beach Causeway) to become 113th Street N at 54th Avenue N. The arterial runs 7.43 miles north through the city of Seminole to CR 416 (W Bay Drive) in Largo. 08/15/15 |
 | SR 666 spans the Gulf Intracoastal Waterway over a bascule bridge. The Intracoastal Waterway (ICWW) follows Boca Ciega Bay southward to Tampa Bay at Tarpon Key and northward to Travatine Island at Indian Shores. 08/15/15 |
 | The draw bridge over the ICWW was built in 1962. A $2.8 million maintenance project underway from Summer 2015 to Fall 2016 involved the restoration of concrete support beams and the bridge foundation, repairing the bridge deck and work on the bridge tender house.1 08/15/15 |
 | The ICWW bridge rises to a height of 19.7 feet. The 751.7 foot long span supports four lanes across a 56.1 foot wide deck.2 08/15/15 |
 | Madeira Way branches west from SR 666 (150th Avenue) to Gulf Boulevard at Archibald Memorial Beach Park. 08/15/15 |
 | SR 666 (150th Avenue) west concludes at SR 699 (Gulf Boulevard) in the Madeia Beach business district. 10/01/16 |
 | The shield assembly for SR 699 posted along 150th Avenue previously faced the adjacent parking lot. 06/14/14 |
 | SR 699 takes Gulf Boulevard north from Madeira Beach to Redington Beach, North Redington Beach, Redington Shores and Indian Shores. 06/14/14 |
 | SR 666 (150th Avenue) intersects SR 699 (Gulf Boulevard) across from the Ocean Sands condominium complex. Public parking is available just to the north at Archibald Memorial Beach Park. 10/01/16 |
 | SR 699 (Gulf Boulevard) runs south from Madeira Beach to Treasure Island, St. Pete Beach and SR 682 (Pinellas Bayway) ahead of Pass-A-Grille Beach. 06/14/14 |
Sources:
- "Upgrades planned for Tom Stuart Causeway Bridge." Beach Beacon (Tampa Bay), July 22, 2015.
- SR-666 over ICWW, Pinellas County, Florida. BridgeReports.com
Photo Credits:
06/14/14, 08/15/15, 10/01/16, 05/06/17 by AARoads
Connect with:
U.S. 19 Alternate
State Road 699 - Gulf Boulevard
Page Updated 03-26-2021.