US Bridges

US-31 NB over US-31 Br Polk RD

Fair

Oceana County, Michigan · 1.5 MI W of Hart · Structure no. 000000000008351

Built
1975
50 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
96 ft
1 main span
Daily traffic
4,806
2007 count
Owner
State
State Highway Agency

About this bridge

US-31 NB over US-31 Br Polk RD is a steel stringer/multi-beam or girder carrying US-31 NB over US-31 Br Polk RD in Oceana County, Michigan. It was built in 1975, so it is 50 years old, older 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 4,806 vehicles a day, roughly 11% of them trucks, projected to reach 5,668 by 2018. The structure is 96 ft (29.2 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 NB
CrossesUS-31 Br Polk RD
Location1.5 MI W of Hart
RouteU.S. Route 31
CountyOceana County
StateMichigan
Coordinates43.68916, -86.39216
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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2023
Inspection intervalevery 24 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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating105.1 US tons
Inventory rating62.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length96 ft (29.2 m)
Longest span96 ft (29.2 m)
Deck width44 ft (13.5 m)
Roadway width43 ft (13 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,806 (2007)
Projected traffic5,668 by 2018
Trucks11%
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$41,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was US-31 NB over US-31 Br Polk RD built?

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

What condition is US-31 NB over US-31 Br Polk RD 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 November 2023.

How much traffic does US-31 NB over US-31 Br Polk RD carry?

About 4,806 vehicles per day (2007 count), of which roughly 11% are trucks.

How long is US-31 NB over US-31 Br Polk RD?

The structure is 96 ft (29.2 m) long with a longest span of 96 ft (29.2 m) and a deck 44 ft wide.

Who owns US-31 NB over US-31 Br Polk RD?

It is owned by the State Highway Agency.