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Interstate 75 at County Road 581 (Bruce B. Downs Blvd.) Flyover Bridge (completed December 2008)

Project Description

Financial Project # 408460-1 & 408460-3
Project Length: 3 miles roadway; 1/3 mile bridge
Construction Cost: $42 million
Contractor: PCL Civil Constructors, Inc.
Start Date: March 7, 2007
Completed: December 13, 2008

About this Project
The Florida Department of Transportation's contractor has completed making a number of improvements to the Interstate 75 interchange at County Road 581 (Bruce B. Downs Boulevard).

The major feature of the project was to change the entrance from southbound CR 581 from the existing two-lane left turn to a right entrance flyover bridge.

The project also:

  • realigned the northbound CR 581 entrance ramp to southbound I-75
  • widened the northbound CR 581 entrance ramp to northbound I-75;
  • constructed a new connection from southbound CR 581 to the new flyover bridge;
  • realigned the southbound CR 581 entrance ramp to northbound I-75; and
  • extended the flyover ramp lane to southbound I-75 from CR 581 to the Hillsborough River.Drainage work for the future Hillsborough County widening project of CR 581 was also constructed, as well as six ponds and various storm water facilities. There was also a slight realignment of the existing pedestrian trail.

    The signals at the ramps of CR 581 and I-75 were improved, high mast lighting was installed at the interchange, and signs were improved.

    The contract also included enhancements to the Vickers Swamp Mitigation area off of County Road 54.

    Lane Closure and Detour Hours were:
    * 8:30 p.m. to 5 a.m.

    * Most lane closures and detours occured between 9 p.m. and 5 a.m. as needed.