US Bridges

SR 570 Polk 24.3 over I-4/SR400

Good

Polk County, Florida · I-4/SR 400 · Structure no. 160281

Built
1999
26 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
321 ft
3 main spans
Daily traffic
5,650
2022 count
Owner
Toll Authority
State Toll Authority

About this bridge

SR 570 Polk 24.3 over I-4/SR400 is a prestressed concrete stringer/multi-beam or girder carrying SR 570 Polk 24.3 over I-4/SR400 in Polk County, Florida. It was built in 1999, so it is 26 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 5,650 vehicles a day, roughly 15% of them trucks, projected to reach 9,803 by 2044. The structure is 321 ft (97.9 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSR 570 Polk 24.3
CrossesI-4/SR400
LocationI-4/SR 400
RouteState Highway 570
CountyPolk County
StateFlorida
Coordinates28.15441, -81.84672
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating83.7 US tons
Inventory rating50.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length321 ft (97.9 m)
Longest span138 ft (42.1 m)
Deck width30 ft (9.2 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,650 (2022)
Projected traffic9,803 by 2044
Trucks15%
Lanes on structure1
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a toll road
National Highway SystemYes

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
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 SR 570 Polk 24.3 over I-4/SR400 built?

It was built in 1999, making it 26 years old in 2025.

What condition is SR 570 Polk 24.3 over I-4/SR400 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 April 2024.

How much traffic does SR 570 Polk 24.3 over I-4/SR400 carry?

About 5,650 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is SR 570 Polk 24.3 over I-4/SR400?

The structure is 321 ft (97.9 m) long with a longest span of 138 ft (42.1 m) and a deck 30 ft wide.

Who owns SR 570 Polk 24.3 over I-4/SR400?

It is owned by the State Toll Authority.