US Bridges

9th Street over Gun River

Good

Allegan County, Michigan · Gun Plain Twp Sec 17 · Structure no. 000000000000251

Built
1982
43 years old
Condition
Good
inspected April 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
55 ft
1 main span
Daily traffic
268
2013 count
Owner
County
County Highway Agency

About this bridge

9th Street over Gun River is a prestressed concrete box beam or girders - multiple carrying 9th Street over Gun River in Allegan County, Michigan. It was built in 1982, so it is 43 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 268 vehicles a day, roughly 5% of them trucks, projected to reach 398 by 2033. The structure is 55 ft (16.9 m) long and 31 ft wide. If it were closed, the detour would be 5 mi (8 km).

Carries9th Street
CrossesGun River
LocationGun Plain Twp Sec 17
RouteCounty Highway 0
Coordinates42.47441, -85.62775
Functional classRural Local

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.7 US tons
Inventory rating35.4 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20 + Mod
Structure length55 ft (16.9 m)
Longest span55 ft (16.9 m)
Deck width31 ft (9.5 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic268 (2013)
Projected traffic398 by 2033
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 9th Street over Gun River built?

It was built in 1982, making it 43 years old in 2025.

What condition is 9th Street over Gun River 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 April 2023.

How much traffic does 9th Street over Gun River carry?

About 268 vehicles per day (2013 count), of which roughly 5% are trucks.

How long is 9th Street over Gun River?

The structure is 55 ft (16.9 m) long with a longest span of 55 ft (16.9 m) and a deck 31 ft wide.

Who owns 9th Street over Gun River?

It is owned by the County Highway Agency.