US Bridges

118th Ave over Swan Creek

Poor

Allegan County, Michigan · Approx 1/4 MI W of 44th S · Structure no. 000000000000177

Built
1924
101 years old
Condition
Poor
inspected September 2023
Type
Girder and Floorbeam System
Concrete
Length
50 ft
1 main span
Daily traffic
1,077
2003 count
Owner
County
County Highway Agency

About this bridge

118th Ave over Swan Creek is a concrete girder and floorbeam system carrying 118th Ave over Swan Creek in Allegan County, Michigan. It was built in 1924, so it is 101 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 1,077 vehicles a day, roughly 7% of them trucks, projected to reach 2,154 by 2023. The structure is 50 ft (15.2 m) long and 29 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Carries118th Ave
CrossesSwan Creek
LocationApprox 1/4 MI W of 44th S
RouteCounty Highway 338
Coordinates42.55233, -85.97944
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating53 US tons
Inventory rating25.6 US tons

Structure

MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length50 ft (15.2 m)
Longest span48 ft (14.6 m)
Deck width29 ft (8.9 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,077 (2003)
Projected traffic2,154 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 118th Ave over Swan Creek built?

It was built in 1924, making it 101 years old in 2025.

What condition is 118th Ave over Swan Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2023.

How much traffic does 118th Ave over Swan Creek carry?

About 1,077 vehicles per day (2003 count), of which roughly 7% are trucks.

How long is 118th Ave over Swan Creek?

The structure is 50 ft (15.2 m) long with a longest span of 48 ft (14.6 m) and a deck 29 ft wide.

Who owns 118th Ave over Swan Creek?

It is owned by the County Highway Agency.