Florida State Road 688

State Road 688 (SR 688) is an east–west route in Pinellas County running from Indian Rocks Beach to northeastern St. Petersburg, Florida, where it merges onto Interstate 275 (I-275).

State Road 688 marker

State Road 688

Route information
Maintained by FDOT
Length12.913 mi[1] (20.781 km)
Major junctions
West end SR 699 in Indian Rocks Beach
Major intersections
East end I-275 in St. Petersburg
Location
CountryUnited States
StateFlorida
CountiesPinellas
Highway system
← SR 687→ SR 693

Route description
Looking west from the Pinellas Trail bridge over Ulmerton Road

The highway changes its name as it heads east across Pinellas County. From Gulf Boulevard in Indian Rocks Beach, it runs along 5th Avenue and crosses the bridge over the Intracoastal Waterway as the Indian Rocks Causeway. Once off the causeway, it becomes Walsingham Road and runs on to the intersection of Walsingham and Ulmerton Roads. Walsingham continues east, but State Road 688 loops north and then east on Ulmerton Road. It skirts Largo before crossing U.S. Route 19 (US 19) and then merges briefly with Roosevelt Boulevard (SR 686). It continues into northeast St. Petersburg and its traffic merges with I-275.

History

Ulmerton Road was named for the community of Ulmers, which arose around Marion Ulmer's turpentine still, timber and naval stores interests in the first half of the twentieth century. In the 1950s, the area was very rural, and cattle were driven along the then dirt road. Today it carries traffic across the middle of the most densely populated county in Florida.

Major intersections

The entire route is in Pinellas County.

Locationmi[1]kmDestinationsNotes
Indian Rocks Beach0.0000.000

 SR 699 south / CR 183 north (Gulf Boulevard) – Indian Shores, Belleair Shore
Indian Rocks Beach
Largo		0.283–
0.370		0.455–
0.595		Indian Rocks Causeway over The Narrows (Gulf Intracoastal Waterway)
Largo0.6931.115Hamlin Boulevard (CR 213 south)
1.1921.918 CR 233 (Indian Rocks Road / Oakhurst Road) – Belleair Bluffs, Seminole
1.9483.135Vonn Road / 131st Street (CR 263)
​2.2503.621Walsingham Road (CR 330 east) - Botanical Gardens, Heritage Village, Museum of Art
Largo3.9146.299Ridge Road (CR 313 south)
4.0356.494 CR 321 (Ridge Road / 113th Street)
4.5457.314
 US 19 Alt. (Seminole Boulevard / SR 595) – Largo, Seminole
​5.5418.917Lake Avenue Southeast (CR 375 north)
Largo6.0539.741 CR 1 (Starkey Road)
7.07211.381Belcher Road (CR 501)
8.11413.058 SR 693 (66th Street) – Clearwater, Pinellas Park
​8.457–
8.546		13.610–
13.753		 US 19 (SR 55) – Clearwater, Pinellas Park, St. Petersburg
​8.60413.84762nd Street North (CR 563)
Pinellas Park9.85115.85449th Street North (CR 611)
10.325–
10.403		16.616–
16.742
 SR 686 west (Roosevelt Boulevard) – Largo, Clearwater		West end of SR 686 overlap; no access from SR 688 east to SR 686 west
St. Petersburg11.137–
11.570		17.923–
18.620


 SR 686 east (Roosevelt Boulevard) to I-275 south – St. Petersburg		Interchange; east end of SR 686 overlap
12.91320.781 I-275 (SR 93) / Martin Luther King Jr. Street (CR 803 south) – Tampa, BradentonI-275 exit 31; no access from I-275 north or CR 803 north to SR 688 west
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

References
  1. Transportation and Data Analytics Office (September 27, 2019). "Straight Line Diagram of Road Inventory". Florida Department of Transportation. Retrieved February 8, 2020.

Further reading
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