US Bridges

SR 18 over Salamonie River

Fair

Blackford County, Indiana · 05.83 E SR 3 · Structure no. 004890

Built
1924
101 years old, rebuilt 2015
Condition
Fair
inspected May 2023
Type
Arch - Deck
Concrete
Length
226 ft
3 main spans
Daily traffic
2,140
2020 count
Owner
State
State Highway Agency

About this bridge

SR 18 over Salamonie River is a concrete arch - deck carrying SR 18 over Salamonie River in Blackford County, Indiana. It was built in 1924 and reconstructed in 2015, so it is 101 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 2,140 vehicles a day, roughly 26% of them trucks, projected to reach 3,670 by 2033. The structure is 226 ft (68.8 m) long and 47 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesSR 18
CrossesSalamonie River
Location05.83 E SR 3
RouteState Highway 18
CountyBlackford County
StateIndiana
Coordinates40.55466, -85.26147
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87.4 US tons
Inventory rating52.1 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length226 ft (68.8 m)
Longest span65 ft (19.8 m)
Deck width47 ft (14.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,140 (2020)
Projected traffic3,670 by 2033
Trucks26%
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 18 over Salamonie River built?

It was built in 1924, making it 101 years old in 2025. It was reconstructed in 2015.

What condition is SR 18 over Salamonie River 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 SR 18 over Salamonie River carry?

About 2,140 vehicles per day (2020 count), of which roughly 26% are trucks.

How long is SR 18 over Salamonie River?

The structure is 226 ft (68.8 m) long with a longest span of 65 ft (19.8 m) and a deck 47 ft wide.

Who owns SR 18 over Salamonie River?

It is owned by the State Highway Agency.