US Bridges

SR20 over Basin Bayou

Fair

Walton County, Florida · 6 Mi. West of Freeport · Structure no. 600910

Built
1972
53 years old
Condition
Fair
inspected October 2023
Type
Slab
Concrete Continuous
Length
115 ft
4 main spans
Daily traffic
10,500
2022 count
Owner
State
State Highway Agency

About this bridge

SR20 over Basin Bayou is a concrete continuous slab carrying SR20 over Basin Bayou in Walton County, Florida. It was built in 1972, so it is 53 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 6 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 10,500 vehicles a day, roughly 9% of them trucks, projected to reach 18,218 by 2044. The structure is 115 ft (35.1 m) long and 46 ft wide. If it were closed, the detour would be 34.8 mi (56 km).

Location

Open in Google Maps
CarriesSR20
CrossesBasin Bayou
Location6 Mi. West of Freeport
RouteState Highway 20
CountyWalton County
StateFlorida
Coordinates30.48682, -86.2506
Functional classRural Principal Arterial - Other

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70 US tons
Inventory rating42 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length115 ft (35.1 m)
Longest span38 ft (11.7 m)
Deck width46 ft (14.1 m)
Roadway width43 ft (13.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,500 (2022)
Projected traffic18,218 by 2044
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed34.8 mi (56 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR20 over Basin Bayou built?

It was built in 1972, making it 53 years old in 2025.

What condition is SR20 over Basin 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 October 2023.

How much traffic does SR20 over Basin Bayou carry?

About 10,500 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is SR20 over Basin Bayou?

The structure is 115 ft (35.1 m) long with a longest span of 38 ft (11.7 m) and a deck 46 ft wide.

Who owns SR20 over Basin Bayou?

It is owned by the State Highway Agency.