US Bridges

106th Ave over Gun River

Fair

Allegan County, Michigan · Just East of Hill Road · Structure no. 000000000000172

Built
1971
54 years old
Condition
Fair
inspected September 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
70 ft
2 main spans
Daily traffic
3,322
2003 count
Owner
County
County Highway Agency

About this bridge

106th Ave over Gun River is a prestressed concrete box beam or girders - multiple carrying 106th Ave over Gun River in Allegan County, Michigan. It was built in 1971, so it is 54 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 3,322 vehicles a day, roughly 7% of them trucks, projected to reach 6,644 by 2023. The structure is 70 ft (21.3 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries106th Ave
CrossesGun River
LocationJust East of Hill Road
RouteCounty Highway 312
CountyAllegan County
StateMichigan
Coordinates42.46243, -85.67891
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating65.7 US tons
Inventory rating39.2 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20 + Mod
Structure length70 ft (21.3 m)
Longest span35 ft (10.6 m)
Deck width33 ft (10.1 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,322 (2003)
Projected traffic6,644 by 2023
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 106th Ave over Gun River built?

It was built in 1971, making it 54 years old in 2025.

What condition is 106th Ave over Gun 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 September 2023.

How much traffic does 106th Ave over Gun River carry?

About 3,322 vehicles per day (2003 count), of which roughly 7% are trucks.

How long is 106th Ave over Gun River?

The structure is 70 ft (21.3 m) long with a longest span of 35 ft (10.6 m) and a deck 33 ft wide.

Who owns 106th Ave over Gun River?

It is owned by the County Highway Agency.