US Bridges

County Line Road over I-4 (SR-400)

Good

Polk County, Florida · 0.7 MI N/O New Tampa Hwy. · Structure no. 160297

Built
1999
26 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
318 ft
3 main spans
Daily traffic
25,000
2024 count
Owner
State
State Highway Agency

About this bridge

County Line Road over I-4 (SR-400) is a prestressed concrete stringer/multi-beam or girder carrying County Line Road over I-4 (SR-400) 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 25,000 vehicles a day, roughly 13% of them trucks, projected to reach 31,250 by 2044. The structure is 318 ft (96.9 m) long and 106 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCounty Line Road
CrossesI-4 (SR-400)
Location0.7 MI N/O New Tampa Hwy.
RouteCounty Highway 0
CountyPolk County
StateFlorida
Coordinates28.03681, -82.05594
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating94.2 US tons
Inventory rating56.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length318 ft (96.9 m)
Longest span138 ft (42.1 m)
Deck width106 ft (32.3 m)
Roadway width90 ft (27.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25,000 (2024)
Projected traffic31,250 by 2044
Trucks13%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 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 County Line Road over I-4 (SR-400) built?

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

What condition is County Line Road 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 July 2024.

How much traffic does County Line Road over I-4 (SR-400) carry?

About 25,000 vehicles per day (2024 count), of which roughly 13% are trucks.

How long is County Line Road over I-4 (SR-400)?

The structure is 318 ft (96.9 m) long with a longest span of 138 ft (42.1 m) and a deck 106 ft wide.

Who owns County Line Road over I-4 (SR-400)?

It is owned by the State Highway Agency.