US Bridges

CR579 Thonotosassa over I-4 (SR-400)

Good

Hillsborough County, Florida · 1.5 Miles East of I-75 · Structure no. 100612

Built
1998
27 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
325 ft
2 main spans
Daily traffic
11,100
2023 count
Owner
State
State Highway Agency

About this bridge

CR579 Thonotosassa over I-4 (SR-400) is a steel continuous stringer/multi-beam or girder carrying CR579 Thonotosassa over I-4 (SR-400) in Hillsborough County, Florida. It was built in 1998, so it is 27 years old, younger than the Florida average of 41.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 11,100 vehicles a day, roughly 9% of them trucks, projected to reach 19,258 by 2042. The structure is 325 ft (99.1 m) long and 116 ft wide. If it were closed, the detour would be 7.5 mi (12 km).

Location

Open in Google Maps
CarriesCR579 Thonotosassa
CrossesI-4 (SR-400)
Location1.5 Miles East of I-75
RouteCounty Highway 579
CountyHillsborough County
StateFlorida
Coordinates28.00614, -82.30241
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating90.3 US tons
Inventory rating54.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length325 ft (99.1 m)
Longest span162 ft (49.5 m)
Deck width116 ft (35.4 m)
Roadway width100 ft (30.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,100 (2023)
Projected traffic19,258 by 2042
Trucks9%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed7.5 mi (12 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was CR579 Thonotosassa over I-4 (SR-400) built?

It was built in 1998, making it 27 years old in 2025.

What condition is CR579 Thonotosassa over I-4 (SR-400) in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2023.

How much traffic does CR579 Thonotosassa over I-4 (SR-400) carry?

About 11,100 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is CR579 Thonotosassa over I-4 (SR-400)?

The structure is 325 ft (99.1 m) long with a longest span of 162 ft (49.5 m) and a deck 116 ft wide.

Who owns CR579 Thonotosassa over I-4 (SR-400)?

It is owned by the State Highway Agency.