US Bridges

M-231 over Sleeper Street

Good

Ottawa County, Michigan · 3.5 MI N of M-45 · Structure no. 000000000013456

Built
2014
11 years old
Condition
Good
inspected October 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
143 ft
1 main span
Daily traffic
3,500
Owner
State
State Highway Agency

About this bridge

M-231 over Sleeper Street is a prestressed concrete box beam or girders - multiple carrying M-231 over Sleeper Street in Ottawa County, Michigan. It was built in 2014, so it is 11 years old, younger than the Michigan average of 48.3 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 3,500 vehicles a day, roughly 8% of them trucks, projected to reach 22,000 by 2035. The structure is 143 ft (43.6 m) long and 50 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesM-231
CrossesSleeper Street
Location3.5 MI N of M-45
RouteState Highway 231
CountyOttawa County
StateMichigan
Coordinates43.02322, -86.09167
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 inspectionOctober 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 rating76.1 US tons
Inventory rating43.5 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadGreater than HL 93
Structure length143 ft (43.6 m)
Longest span140 ft (42.6 m)
Deck width50 ft (15.1 m)
Roadway width46 ft (14 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,500 (—)
Projected traffic22,000 by 2035
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was M-231 over Sleeper Street built?

It was built in 2014, making it 11 years old in 2025.

What condition is M-231 over Sleeper Street 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 October 2023.

How much traffic does M-231 over Sleeper Street carry?

About 3,500 vehicles per day (latest count), of which roughly 8% are trucks.

How long is M-231 over Sleeper Street?

The structure is 143 ft (43.6 m) long with a longest span of 140 ft (42.6 m) and a deck 50 ft wide.

Who owns M-231 over Sleeper Street?

It is owned by the State Highway Agency.