Interstate 175 Florida

Overview

Interstate 175 (South Bay Drive) constitutes the southern freeway spur connecting I-275 with Tropicana Field and Downtown St. Petersburg. The second shortest Interstate in Florida, I-175 is only one-tenth of a mile longer than nearby Interstate 375 (North Bay Drive). The freeway doubles as Florida State Road 594, which extends one block east of the freeway end to SR 687 (3rd Street South) north.

Serving the St. Petersburg Innovation District, a new ramp opened from 4th Street S northbound to I-175 west by Summer 2017. Planned since 2005, the $600,000 project was funded by the Florida Department of Transportation (FDOT). The connection improved access to the Interstate system from Johns Hopkins All Children’s Hospital, the University of South Florida St. Petersburg and the Dali Museum.1

History

When Interstate 75 was relocated to the east Tampa bypass in Hillsborough County in the late 1970s, five miles of eligible Interstate mileage became available for use elsewhere in Florida. Some of this unused mileage was allocated for the South Bay Drive spur to Downtown St. Petersburg (Interstate 175).

South Bay Drive was constructed in tandem with North Bay Drive (I-375) in two phases between 1977 and 1980. Work on the final link for the freeway, between 9th Street S (Martin Luther King, Jr. Street) and 4th Street S, commenced in 1977.2 Interstate 175 opened to traffic without fanfare on July 23, 1980 at total cost of $8.5-million. However it was not officially included in the Interstate System until November 1982.3

Route Information

  • West End – St. Petersburg, FL

  • East End – St. Petersburg, FL

  • Mileage – 1.44
  • Cities – St. Petersburg
  • Junctions

Source: December 31, 2018 Interstate Route Log and Finders List

I-175 Annual Average Daily Traffic (AADT)

Vehicles per day Location
45,500 I-275 to MLK St S
30,500 MLK St S to 6th St S
20,500 6th St s to 4th St S

Source: 2018 AADT  – Florida Traffic Online

Highway Guides

East End Florida 594 Florida 687 – St. Petersburg, Florida

I-175 East at Florida 594 Florida 687

I-175 east at MLK St - St. Petersburg, FL

Back to back half diamond interchanges with MLK, Jr. Street S/8th Street S and 6th Street S precede the freeway end where I-175 shifts onto 5th Avenue S at SR 687 (4th St S). Photo taken 07/10/11.

I-175 east at 4th St S - St. Petersburg, FL

Spanning 6th Street S, 1,000 feet remain along Interstate 175 east before the transition onto 5th Avenue S (SR 594) at SR 687 (4th Street S). Photo taken 07/10/11.

I-175 east at 4th St S - St. Petersburg, FL

Two lanes lower to grade level and combine with 5th Avenue S ahead of USF St. Petersburg and the south end of SR 687 (4th Street S). Photo taken 10/08/16.

I-175 east at 4th St S - St. Petersburg, FL

SR 594 extends east from the end of I-175 one block to SR 687 (3rd Street N) northbound. The Dali Museum lies an additional two blocks further along 5th Avenue S. Photo taken 07/10/11.

Florida 687 South at I-175 Florida 594

SR 687 south at I-175 - St. Petersburg, FLSR 687 south at I-175 - St. Petersburg, FLSR 687 south at I-175 - St. Petersburg, FL

State Road 687 (4th Street S) reaches the entrance ramp to Interstate 175 west at Delmar Terrace S. Two lanes depart for the 1.44-mile long connector to Interstate 275. SR 687 ends at the adjacent intersection with 5th Avenue S (SR 594) while 4th Street S continues into the Bartlett Park neighborhood. Photos taken 07/10/11 and 10/08/17.

4th Street S north at I-175 Florida 594

4th St S north at SR 594/I-175 - St. Petersburg4th St S at I-175 - St. Petersburg, FL4th St S at I-175 - St. Petersburg, FL

4th St S north at the entrance ramp to Interstate 175 that opened to traffic in 2017. Photos taken 10/08/17.

I-175 East End Throwback

I-175 east at 9th/8th St S - 2000

Original signage posted at the 9th and 8th Street S off-ramp. Photo taken 12/27/00.

I-175 east at 4th St S - 2006

Button copy guide signs were replaced sometime after 2006 on the approach to 4th Street S along 5th Avenue S (SR 594). Photo taken 07/30/06.

West End I-275 – St. Petersburg, Florida

I-175 West at I-275

I-175 west at I-275 - St. Petersburg, FL

Spanning 16th Street S, Interstate 175 westbound separates with two lanes for both I-275 north to Tampa and I-275 south to the Sunshine Skyway Bridge and Bradenton (via U.S. 19). Photo taken 07/10/11.

I-175 west at I-275 - St. Petersburg, FL

The connection to Interstate 275 south merges on the left side of the freeway mainline prior to the half diamond interchange with 28th Street S. Photo taken 07/30/06.

I-275 South at I-175

I-275 south at I-175 - St. Petersburg, FL

Traveling along a viaduct over the St. Petersburg street grid, Interstate 275 advances a half mile south to the three wye interchange (Exit 22) with I-175 (South Bay Drive) east. Photo taken 05/28/14.

I-275 south at I-175 - St. Petersburg, FL

A weaving traffic pattern unfolds along I-275 south between the adjacent exchanges with I-375 (North Bay Drive) and the left exit for Interstate 175 east. Photo taken 05/28/14.

I-275 south at I-175 - St. Petersburg, FL

Southbound I-275 reduces to two lanes with the lane drop for Interstate 175 east at Exit 22. The ensuing stretch of I-275 winds through South St. Petersburg to the Sunshine Skyway Bridge into Manatee County. Photo taken 10/08/16.

I-275 south at I-175 - St. Petersburg, FL

Flyovers for I-175 (South Bay Drive) east combine just ahead of the the off-ramp for M.L. King, Jr. St S. Photo taken 10/08/16.

I-275 North at I-175

I-275 north at I-175 - St. Petersburg, FL
I-275 north at I-175 - St. Petersburg, FL

Passing over 28th Street S on the approach to I-175 (South Bay Drive) east on I-275 northbound. I-175 and I-375 depart within three quarter miles of each other along the periphery of Downtown St. Petersburg. Photos taken 07/06/13.

I-275 north at I-175 - St. Petersburg, FL

A lane drop occurs along Interstate 275 north for I-175 east at Exit 22. In addition to connecting I-275 with Tropicana Field, South Bay Drive leads east toward Mahaffey Theater, the Salvador Dali Museum and Albert Whitted Airport (SPG). Photo taken 07/06/13.

I-275 north at I-175 - St. Petersburg, FL

Tropicana Field, home of the Tampa Bay Rays, lies within the northeast quadrant of the I-275/175 exchange. Nearby ramps connect I-175 with MLK, Jr. Street to the ball park and 6th Street S to USF St. Petersburg. Photo taken 01/12/14.

Sources:

  1. “New downtown St. Pete on-ramp expected to be a boon for Innovation District.” Tampa Bay Business Journal. March 15, 2017.
  2. “I-275 south feeder is open downtown.” St. Petersburg Times, July 24, 1980.
  3. American Association of State Highway and Transportation Officials (AASHTO) Route Numbering Committee Meeting, November 19, 1982 (document).

Page updated May 21, 2019.