US Bridges

US 31 NB over I-90 Eb/Wb

Good

St. Joseph County, Indiana · 01.69 N US 20 · Structure no. 010218

Built
1975
50 years old, rebuilt 1992
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
235 ft
2 main spans
Daily traffic
9,890
2014 count
Owner
State
State Highway Agency

About this bridge

US 31 NB over I-90 Eb/Wb is a steel continuous stringer/multi-beam or girder carrying US 31 NB over I-90 Eb/Wb in St. Joseph County, Indiana. It was built in 1975 and reconstructed in 1992, so it is 50 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 9,890 vehicles a day, roughly 34% of them trucks, projected to reach 12,647 by 2029. The structure is 235 ft (71.6 m) long and 55 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesUS 31 NB
CrossesI-90 Eb/Wb
Location01.69 N US 20
RouteU.S. Route 31
StateIndiana
Coordinates41.73037, -86.33917
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.5 US tons
Inventory rating36.4 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length235 ft (71.6 m)
Longest span115 ft (35 m)
Deck width55 ft (16.9 m)
Roadway width52 ft (16 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,890 (2014)
Projected traffic12,647 by 2029
Trucks34%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 31 NB over I-90 Eb/Wb built?

It was built in 1975, making it 50 years old in 2025. It was reconstructed in 1992.

What condition is US 31 NB over I-90 Eb/Wb 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 July 2023.

How much traffic does US 31 NB over I-90 Eb/Wb carry?

About 9,890 vehicles per day (2014 count), of which roughly 34% are trucks.

How long is US 31 NB over I-90 Eb/Wb?

The structure is 235 ft (71.6 m) long with a longest span of 115 ft (35 m) and a deck 55 ft wide.

Who owns US 31 NB over I-90 Eb/Wb?

It is owned by the State Highway Agency.