US Bridges

SR 71 over Salmon Creek

Fair

Benton County, Indiana · 00.26 S SR 18 · Structure no. 024690

Built
1967
58 years old, rebuilt 1981
Condition
Fair
inspected November 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
46 ft
1 main span
Daily traffic
240
2021 count
Owner
State
State Highway Agency

About this bridge

SR 71 over Salmon Creek is a prestressed concrete box beam or girders - multiple carrying SR 71 over Salmon Creek in Benton County, Indiana. It was built in 1967 and reconstructed in 1981, so it is 58 years old, older than the Indiana average of 46.6 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 240 vehicles a day, roughly 17% of them trucks, projected to reach 626 by 2034. The structure is 46 ft (14 m) long and 36 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesSR 71
CrossesSalmon Creek
Location00.26 S SR 18
RouteState Highway 71
StateIndiana
Coordinates40.61872, -87.49089
Functional classRural Major 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.5 US tons
Inventory rating51 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length46 ft (14 m)
Longest span45 ft (13.7 m)
Deck width36 ft (11.1 m)
Roadway width34 ft (10.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic240 (2021)
Projected traffic626 by 2034
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

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 71 over Salmon Creek built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 1981.

What condition is SR 71 over Salmon 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 November 2023.

How much traffic does SR 71 over Salmon Creek carry?

About 240 vehicles per day (2021 count), of which roughly 17% are trucks.

How long is SR 71 over Salmon Creek?

The structure is 46 ft (14 m) long with a longest span of 45 ft (13.7 m) and a deck 36 ft wide.

Who owns SR 71 over Salmon Creek?

It is owned by the State Highway Agency.