US Bridges

115th Avenue over Swan Creek

Fair

Allegan County, Michigan · Valley Twp Sec 29 · Structure no. 000000000000308

Built
1981
44 years old
Condition
Fair
inspected April 2023
Type
Culvert
Steel
Length
35 ft
2 main spans
Daily traffic
40
2002 count
Owner
County
County Highway Agency

About this bridge

115th Avenue over Swan Creek is a steel culvert carrying 115th Avenue over Swan Creek in Allegan County, Michigan. It was built in 1981, so it is 44 years old, younger 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.

It carries about 40 vehicles a day, roughly 7% of them trucks, projected to reach 78 by 2022. The structure is 35 ft (10.6 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries115th Avenue
CrossesSwan Creek
LocationValley Twp Sec 29
RouteCounty Highway 0
CountyAllegan County
StateMichigan
Coordinates42.52962, -85.97751
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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating81.8 US tons
Inventory rating48.9 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadH 20
Structure length35 ft (10.6 m)
Longest span15 ft (4.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2002)
Projected traffic78 by 2022
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 115th Avenue over Swan Creek built?

It was built in 1981, making it 44 years old in 2025.

What condition is 115th Avenue 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 April 2023.

How much traffic does 115th Avenue over Swan Creek carry?

About 40 vehicles per day (2002 count), of which roughly 7% are trucks.

How long is 115th Avenue over Swan Creek?

The structure is 35 ft (10.6 m) long with a longest span of 15 ft (4.5 m).

Who owns 115th Avenue over Swan Creek?

It is owned by the County Highway Agency.