US Bridges

39th Ave. South over Big Bayou

Fair

Pinellas County, Florida · 0.2MI East of 6th St. So. · Structure no. 157196

Built
1955
70 years old, rebuilt 1999
Condition
Fair
inspected May 2023
Type
Slab
Concrete Continuous
Length
84 ft
3 main spans
Daily traffic
4,509
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

39th Ave. South over Big Bayou is a concrete continuous slab carrying 39th Ave. South over Big Bayou in Pinellas County, Florida. It was built in 1955 and reconstructed in 1999, so it is 70 years old, older 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 4,509 vehicles a day, roughly 5% of them trucks, projected to reach 7,823 by 2042. The structure is 84 ft (25.6 m) long and 65 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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Carries39th Ave. South
CrossesBig Bayou
Location0.2MI East of 6th St. So.
RouteCity Street 0
CountyPinellas County
StateFlorida
Coordinates27.73361, -82.63651
Functional classUrban Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating74.5 US tons
Inventory rating44.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length84 ft (25.6 m)
Longest span40 ft (12.2 m)
Deck width65 ft (19.7 m)
Roadway width48 ft (14.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,509 (2023)
Projected traffic7,823 by 2042
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 39th Ave. South over Big Bayou built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 1999.

What condition is 39th Ave. South over Big Bayou 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 May 2023.

How much traffic does 39th Ave. South over Big Bayou carry?

About 4,509 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is 39th Ave. South over Big Bayou?

The structure is 84 ft (25.6 m) long with a longest span of 40 ft (12.2 m) and a deck 65 ft wide.

Who owns 39th Ave. South over Big Bayou?

It is owned by the City or Municipal Highway Agency.