US Bridges

US 421 over Wabash River

Fair

Carroll County, Indiana · 01.19 N Old SR 25 · Structure no. 032330

Built
1996
29 years old
Condition
Fair
inspected July 2024
Type
Tee Beam
Prestressed Concrete Continuous
Length
803 ft
6 main spans
Daily traffic
9,092
2021 count
Owner
State
State Highway Agency

About this bridge

US 421 over Wabash River is a prestressed concrete continuous tee beam carrying US 421 over Wabash River in Carroll County, Indiana. It was built in 1996, so it is 29 years old, younger 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 9,092 vehicles a day, roughly 12% of them trucks, projected to reach 15,205 by 2030. The structure is 803 ft (244.7 m) long and 48 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesUS 421
CrossesWabash River
Location01.19 N Old SR 25
RouteU.S. Route 421
StateIndiana
Coordinates40.59122, -86.69824
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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating95.3 US tons
Inventory rating73.5 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length803 ft (244.7 m)
Longest span134 ft (40.7 m)
Deck width48 ft (14.7 m)
Roadway width45 ft (13.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,092 (2021)
Projected traffic15,205 by 2030
Trucks12%
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 US 421 over Wabash River built?

It was built in 1996, making it 29 years old in 2025.

What condition is US 421 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 July 2024.

How much traffic does US 421 over Wabash River carry?

About 9,092 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is US 421 over Wabash River?

The structure is 803 ft (244.7 m) long with a longest span of 134 ft (40.7 m) and a deck 48 ft wide.

Who owns US 421 over Wabash River?

It is owned by the State Highway Agency.