US Bridges

US-31 over S Br Lincoln River

Fair

Mason County, Michigan · 4.2 MI N of US-10 · Structure no. 000000000006640

Built
1992
33 years old
Condition
Fair
inspected May 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
50 ft
1 main span
Daily traffic
6,578
2007 count
Owner
State
State Highway Agency

About this bridge

US-31 over S Br Lincoln River is a prestressed concrete box beam or girders - multiple carrying US-31 over S Br Lincoln River in Mason County, Michigan. It was built in 1992, so it is 33 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 6 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 6,578 vehicles a day, roughly 8% of them trucks, projected to reach 9,001 by 2018. The structure is 50 ft (15.2 m) long and 51 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesUS-31
CrossesS Br Lincoln River
Location4.2 MI N of US-10
RouteU.S. Route 31
CountyMason County
StateMichigan
Coordinates44.01463, -86.28025
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating90.7 US tons
Inventory rating52.1 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length50 ft (15.2 m)
Longest span50 ft (15.2 m)
Deck width51 ft (15.6 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,578 (2007)
Projected traffic9,001 by 2018
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 over S Br Lincoln River built?

It was built in 1992, making it 33 years old in 2025.

What condition is US-31 over S Br Lincoln River 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 May 2024.

How much traffic does US-31 over S Br Lincoln River carry?

About 6,578 vehicles per day (2007 count), of which roughly 8% are trucks.

How long is US-31 over S Br Lincoln River?

The structure is 50 ft (15.2 m) long with a longest span of 50 ft (15.2 m) and a deck 51 ft wide.

Who owns US-31 over S Br Lincoln River?

It is owned by the State Highway Agency.