US Bridges

SR 20 over Big Alaqua Creek

Fair

Walton County, Florida · 3.2MI West of US331 SR83 · Structure no. 600096

Built
1978
47 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
210 ft
5 main spans
Daily traffic
10,200
2022 count
Owner
State
State Highway Agency

About this bridge

SR 20 over Big Alaqua Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying SR 20 over Big Alaqua Creek in Walton County, Florida. It was built in 1978, so it is 47 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 10,200 vehicles a day, roughly 10% of them trucks, projected to reach 17,697 by 2044. The structure is 210 ft (64 m) long and 46 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
CarriesSR 20
CrossesBig Alaqua Creek
Location3.2MI West of US331 SR83
RouteState Highway 20
CountyWalton County
StateFlorida
Coordinates30.51221, -86.18634
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.
Superstructure7 GoodSome minor problems.
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 rating85 US tons
Inventory rating51 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length210 ft (64 m)
Longest span42 ft (12.8 m)
Deck width46 ft (14.1 m)
Roadway width43 ft (13.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,200 (2022)
Projected traffic17,697 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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 SR 20 over Big Alaqua Creek built?

It was built in 1978, making it 47 years old in 2025.

What condition is SR 20 over Big Alaqua Creek 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 SR 20 over Big Alaqua Creek carry?

About 10,200 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is SR 20 over Big Alaqua Creek?

The structure is 210 ft (64 m) long with a longest span of 42 ft (12.8 m) and a deck 46 ft wide.

Who owns SR 20 over Big Alaqua Creek?

It is owned by the State Highway Agency.