Interstate 375 Florida
Overview
Interstate 375 (North Bay Drive) is a freeway spur connecting I-275 with U.S. 92/SR 687 (4th Street N) and U.S. 19 Alternate/SR 595 (5th Avenue N) on the north side of Downtown St. Petersburg. I-375 is one tenth of a mile shorter than its southern counterpart, Interstate 175 (South Bay Drive). State Road 592 runs along the entire length of North Bay Drive, which extends east to U.S. 19 Alternate/SR 595 (4th Avenue N) southbound.
Mileage by State
| Florida | 1.22 mi |
Data Sources
December 31, 2025 Interstate Route Log and Finders List
History
Interstate 375 was built between 1977 and 1979 in two phases. The first section opened to traffic on January 17, 1978.1 The remaining portion of the collector freeway was completed in September 1979.2 A ramp stub at the west end alludes to a previously proposed connection with 20th Street N.
North Bay Drive was prematurely signed as Interstate 375, based upon correspondence between the Florida Department of Transportation (FDOT) and the Federal Highway Administration (FHWA) on February 7, 1972:
The possibility of assigning special numbers should be considered; i.e., 182 and 184 or I-175 and I-375. This would simplify the signing and would be consistent with spurs of Interstate Highways which are identified with three digit numbers.
Based upon this, design and construction of North Bay Drive proceeded under the impression that FHWA had approved the route as Interstate 375. Additionally Federal approval and funds were authorized for I-175 and I-375 interchange guide signs along I-275.
A subsequent application from FDOT to the American Association of State Highway and Transportation Officials (AASHTO) on April 21, 1981 formally requested the additions of both I-175 and I-375 to the Interstate System. Both were rejected:
The proposed routings mainly serve traffic into the St. Petersburg central business district. Also, concurrent approval by the Federal Highway Administration would be required.
The FHWA eventually approved both I-175 and I-375, as they were constructed to Interstate standards and were part of the Federal-aid primary system. They were added as logical additions to the Interstate System under the provision of 23 U.S.C. 139(a). FDOT resubmitted I-175 and I-375 to AASHTO in an application on September 14, 1982. They were approved on November 20, 1982.3
East End 
/ 4th Avenue N ‐ St. Petersburg, FL
East at
Interstate 375 (North Bay Drive) navigates through an S-curve above Martin Luther King Jr. and 8th Streets N just ahead of the merge with U.S. 19 ALT/SR 595 (4th Avenue N). 04/03/20
North at
Two lanes separate from 5th Avenue N westbound for Interstate 375. Succeeding ramps connect U.S. 19 Alternate with I-375 just ahead of the directional T interchange with Interstate 275 north to Tampa and south to the Sunshine Skyway. 08/31/19
East End – Past Views
Past Views Gallery (Tap to Expand / Collapse Section)
East
Replaced guide signs for the exit to Dr. Martin Luther King, Jr. St N and 8th St N and the I-375 connection to U.S. 92 (4th Street N). 07/30/06
West End 
‐ St. Petersburg, FL
West at
I-375 west rises over 16th Street N just ahead of the ramp split for Interstate 275. 04/03/20
South at
Crossing 22nd Avenue N, I-275 continues one mile south to Interstate 375 (Exit 23A), the first of two freeways spurring east into Downtown St. Petersburg. 05/28/14
North at
Leaving the three wye interchange (Exit 22) with I-175 east to Tropicana Field, I-275 quickly approaches Interstate 375 east to The Pier. The freeway follows North Bay Drive to U.S. 19 Alternate (4th Avenue N) north of Downtown. 05/25/19
West End – Past Views
Past Views Gallery (Tap to Expand / Collapse Section)
West at
Button copy signs for Interstate 275 along I-375 west were replaced by May 2009. 07/30/06
References
- I-275 downtown feeder now open to northbound traffic. (1978, January 17). St. Petersburg Times.
- American Association of State Highway and Transportation Officials (AASHTO) Route Numbering Committee Meeting, November 20, 1982 (document).