US Bridges

15th Ave. South over Clam Bayou

Good

Pinellas County, Florida · 50FT East of 44th ST S. · Structure no. 157136

Built
1990
35 years old
Condition
Good
inspected May 2023
Type
Culvert
Concrete
Length
22 ft
2 main spans
Daily traffic
2,100
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

15th Ave. South over Clam Bayou is a concrete culvert carrying 15th Ave. South over Clam Bayou in Pinellas County, Florida. It was built in 1990, so it is 35 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 2,100 vehicles a day, roughly 4% of them trucks, projected to reach 3,643 by 2042. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

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Carries15th Ave. South
CrossesClam Bayou
Location50FT East of 44th ST S.
RouteCity Street 0
CountyPinellas County
StateFlorida
Coordinates27.7556, -82.69269
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating61 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length22 ft (6.7 m)
Longest span11 ft (3.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,100 (2023)
Projected traffic3,643 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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 15th Ave. South over Clam Bayou built?

It was built in 1990, making it 35 years old in 2025.

What condition is 15th Ave. South over Clam Bayou 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 May 2023.

How much traffic does 15th Ave. South over Clam Bayou carry?

About 2,100 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is 15th Ave. South over Clam Bayou?

The structure is 22 ft (6.7 m) long with a longest span of 11 ft (3.3 m).

Who owns 15th Ave. South over Clam Bayou?

It is owned by the City or Municipal Highway Agency.