US Bridges

US 31 NB over Peat Area "b"

Good

St. Joseph County, Indiana · 03.67 S SR 4 · Structure no. 076860

Built
2010
15 years old
Condition
Good
inspected February 2023
Type
Tee Beam
Prestressed Concrete Continuous
Length
637 ft
5 main spans
Daily traffic
9,516
2022 count
Owner
State
State Highway Agency

About this bridge

US 31 NB over Peat Area "b" is a prestressed concrete continuous tee beam carrying US 31 NB over Peat Area "b" in St. Joseph County, Indiana. It was built in 2010, so it is 15 years old, younger 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 9,516 vehicles a day, roughly 23% of them trucks, projected to reach 31,136 by 2030. The structure is 637 ft (194.3 m) long and 46 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesUS 31 NB
CrossesPeat Area "b"
Location03.67 S SR 4
RouteU.S. Route 31
StateIndiana
Coordinates41.49512, -86.25593
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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 25 or greater
Structure length637 ft (194.3 m)
Longest span130 ft (39.6 m)
Deck width46 ft (14.1 m)
Roadway width43 ft (13.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,516 (2022)
Projected traffic31,136 by 2030
Trucks23%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesOther
Detour if closed3.7 mi (6 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 Peat Area "b" built?

It was built in 2010, making it 15 years old in 2025.

What condition is US 31 NB over Peat Area "b" 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 February 2023.

How much traffic does US 31 NB over Peat Area "b" carry?

About 9,516 vehicles per day (2022 count), of which roughly 23% are trucks.

How long is US 31 NB over Peat Area "b"?

The structure is 637 ft (194.3 m) long with a longest span of 130 ft (39.6 m) and a deck 46 ft wide.

Who owns US 31 NB over Peat Area "b"?

It is owned by the State Highway Agency.