US Bridges

US 31 NB over Prairie Ditch

Good

Miami County, Indiana · 00.61 S US 24 · Structure no. 009940

Built
1963
62 years old, rebuilt 2018
Condition
Good
inspected August 2023
Type
Slab
Concrete Continuous
Length
101 ft
3 main spans
Daily traffic
10,418
2018 count
Owner
State
State Highway Agency

About this bridge

US 31 NB over Prairie Ditch is a concrete continuous slab carrying US 31 NB over Prairie Ditch in Miami County, Indiana. It was built in 1963 and reconstructed in 2018, so it is 62 years old, older than the Indiana average of 46.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 10,418 vehicles a day, roughly 20% of them trucks, projected to reach 11,008 by 2032. The structure is 101 ft (30.9 m) long and 40 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesUS 31 NB
CrossesPrairie Ditch
Location00.61 S US 24
RouteU.S. Route 31
StateIndiana
Coordinates40.76411, -86.12755
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.7 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length101 ft (30.9 m)
Longest span40 ft (12.1 m)
Deck width40 ft (12.2 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,418 (2018)
Projected traffic11,008 by 2032
Trucks20%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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 US 31 NB over Prairie Ditch built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 2018.

What condition is US 31 NB over Prairie Ditch in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2023.

How much traffic does US 31 NB over Prairie Ditch carry?

About 10,418 vehicles per day (2018 count), of which roughly 20% are trucks.

How long is US 31 NB over Prairie Ditch?

The structure is 101 ft (30.9 m) long with a longest span of 40 ft (12.1 m) and a deck 40 ft wide.

Who owns US 31 NB over Prairie Ditch?

It is owned by the State Highway Agency.