US Bridges

Frostproof Road over Relief Canal

Fair

Polk County, Florida · 2.3 Miles North of Inters · Structure no. AFFLASPR01090

Built
1995
30 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
30 ft
2 main spans
Daily traffic
50
2024 count
Owner
Federal
Air Force

About this bridge

Frostproof Road over Relief Canal is a wood or timber stringer/multi-beam or girder carrying Frostproof Road over Relief Canal in Polk County, Florida. It was built in 1995, so it is 30 years old, younger than the Florida average of 41.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 50 vehicles a day, projected to reach 60 by 2044. The structure is 30 ft (9.1 m) long and 17 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesFrostproof Road
CrossesRelief Canal
Location2.3 Miles North of Inters
CountyPolk County
StateFlorida
Coordinates27.69728, -81.36722
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadUnknown
Structure length30 ft (9.1 m)
Longest span15 ft (4.5 m)
Deck width17 ft (5.2 m)
Roadway width15 ft (4.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2024)
Projected traffic60 by 2044
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerAir Force
Maintained byAir Force
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$60,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Frostproof Road over Relief Canal built?

It was built in 1995, making it 30 years old in 2025.

What condition is Frostproof Road over Relief Canal in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in January 2024.

How much traffic does Frostproof Road over Relief Canal carry?

About 50 vehicles per day (2024 count).

How long is Frostproof Road over Relief Canal?

The structure is 30 ft (9.1 m) long with a longest span of 15 ft (4.5 m) and a deck 17 ft wide.

Who owns Frostproof Road over Relief Canal?

It is owned by the Air Force.