US Bridges

18th ST over Wabash River

Fair

Cass County, Indiana · 00.60 N of US 24 · Structure no. 0900082

Built
1977
48 years old, rebuilt 2019
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
654 ft
7 main spans
Daily traffic
6,650
2023 count
Owner
County
County Highway Agency

About this bridge

18th ST over Wabash River is a prestressed concrete continuous stringer/multi-beam or girder carrying 18th ST over Wabash River in Cass County, Indiana. It was built in 1977 and reconstructed in 2019, so it is 48 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 6,650 vehicles a day, roughly 9% of them trucks, projected to reach 8,770 by 2043. The structure is 654 ft (199.3 m) long and 39 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries18th ST
CrossesWabash River
Location00.60 N of US 24
RouteCity Street 0
CountyCass County
StateIndiana
Coordinates40.74293, -86.34623
Functional classUrban 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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85.6 US tons
Inventory rating51.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length654 ft (199.3 m)
Longest span100 ft (30.5 m)
Deck width39 ft (11.9 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,650 (2023)
Projected traffic8,770 by 2043
Trucks9%
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

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$73,000 (2026 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was 18th ST over Wabash River built?

It was built in 1977, making it 48 years old in 2025. It was reconstructed in 2019.

What condition is 18th ST over Wabash 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 June 2023.

How much traffic does 18th ST over Wabash River carry?

About 6,650 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is 18th ST over Wabash River?

The structure is 654 ft (199.3 m) long with a longest span of 100 ft (30.5 m) and a deck 39 ft wide.

Who owns 18th ST over Wabash River?

It is owned by the County Highway Agency.