US Bridges

Thornhill Road over Lake Lena Run

Good

Polk County, Florida · 0.9MI South of CR-540 · Structure no. 164558

Built
2023
2 years old
Condition
Good
inspected August 2023
Type
Slab
Prestressed Concrete
Length
40 ft
1 main span
Daily traffic
8,900
2023 count
Owner
County
County Highway Agency

About this bridge

Thornhill Road over Lake Lena Run is a prestressed concrete slab carrying Thornhill Road over Lake Lena Run in Polk County, Florida. It was built in 2023, so it is 2 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 8,900 vehicles a day, projected to reach 15,000 by 2042. The structure is 40 ft (12.3 m) long and 56 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesThornhill Road
CrossesLake Lena Run
Location0.9MI South of CR-540
RouteCounty Highway 0
CountyPolk County
StateFlorida
Coordinates28.00008, -81.81172
Functional classRural Local

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating93.1 US tons
Inventory rating68 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length40 ft (12.3 m)
Longest span40 ft (12.3 m)
Deck width56 ft (17.1 m)
Roadway width47 ft (14.4 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic8,900 (2023)
Projected traffic15,000 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Thornhill Road over Lake Lena Run built?

It was built in 2023, making it 2 years old in 2025.

What condition is Thornhill Road over Lake Lena Run 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 August 2023.

How much traffic does Thornhill Road over Lake Lena Run carry?

About 8,900 vehicles per day (2023 count).

How long is Thornhill Road over Lake Lena Run?

The structure is 40 ft (12.3 m) long with a longest span of 40 ft (12.3 m) and a deck 56 ft wide.

Who owns Thornhill Road over Lake Lena Run?

It is owned by the County Highway Agency.