US Bridges

112th Ave over Swan Creek

FairPosted for load

Allegan County, Michigan · Approx 0.10 MI W of 46th · Structure no. 000000000000174

Built
1964
61 years old
Condition
Fair
inspected September 2023
Type
Culvert
Wood or Timber
Length
25 ft
4 main spans
Daily traffic
288
2003 count
Owner
County
County Highway Agency

About this bridge

112th Ave over Swan Creek is a wood or timber culvert carrying 112th Ave over Swan Creek in Allegan County, Michigan. It was built in 1964, so it is 61 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 288 vehicles a day, roughly 7% of them trucks, projected to reach 576 by 2023. The structure is 25 ft (7.7 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Carries112th Ave
CrossesSwan Creek
LocationApprox 0.10 MI W of 46th
RouteCounty Highway 0
Coordinates42.50656, -85.9937
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.2 US tons
Inventory rating17.5 US tons

Structure

Structure typeCulvert
MaterialWood or Timber
DeckWood or timber
Main spans4
Design loadHS 20 + Mod
Structure length25 ft (7.7 m)
Longest span6 ft (1.8 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic288 (2003)
Projected traffic576 by 2023
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 112th Ave over Swan Creek built?

It was built in 1964, making it 61 years old in 2025.

What condition is 112th Ave over Swan Creek 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 112th Ave over Swan Creek carry?

About 288 vehicles per day (2003 count), of which roughly 7% are trucks.

How long is 112th Ave over Swan Creek?

The structure is 25 ft (7.7 m) long with a longest span of 6 ft (1.8 m).

Who owns 112th Ave over Swan Creek?

It is owned by the County Highway Agency.