US Bridges

US-31 SB over US-31 Br (monroe Road)

Fair

Oceana County, Michigan · 4.0 MI N of Hart · Structure no. 000000000008355

Built
1977
48 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
106 ft
1 main span
Daily traffic
4,413
2007 count
Owner
State
State Highway Agency

About this bridge

US-31 SB over US-31 Br (monroe Road) is a steel stringer/multi-beam or girder carrying US-31 SB over US-31 Br (monroe Road) in Oceana County, Michigan. It was built in 1977, so it is 48 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 4,413 vehicles a day, roughly 10% of them trucks, projected to reach 5,796 by 2018. The structure is 106 ft (32.3 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS-31 SB
CrossesUS-31 Br (monroe Road)
Location4.0 MI N of Hart
RouteU.S. Route 31
CountyOceana County
StateMichigan
Coordinates43.76156, -86.38431
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2025
Inspection intervalevery 15 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating101.1 US tons
Inventory rating60.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length106 ft (32.3 m)
Longest span106 ft (32.3 m)
Deck width44 ft (13.5 m)
Roadway width42 ft (12.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,413 (2007)
Projected traffic5,796 by 2018
Trucks10%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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 proposedDeck replacement with only incidental widening
Estimated improvement cost$45,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was US-31 SB over US-31 Br (monroe Road) built?

It was built in 1977, making it 48 years old in 2025.

What condition is US-31 SB over US-31 Br (monroe Road) 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 January 2025.

How much traffic does US-31 SB over US-31 Br (monroe Road) carry?

About 4,413 vehicles per day (2007 count), of which roughly 10% are trucks.

How long is US-31 SB over US-31 Br (monroe Road)?

The structure is 106 ft (32.3 m) long with a longest span of 106 ft (32.3 m) and a deck 44 ft wide.

Who owns US-31 SB over US-31 Br (monroe Road)?

It is owned by the State Highway Agency.