US Bridges

M-86 over Swan Creek

Fair

St. Joseph County, Michigan · In Colon · Structure no. 000000000010285

Built
2008
17 years old
Condition
Fair
inspected September 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
85 ft
1 main span
Daily traffic
4,063
2007 count
Owner
State
State Highway Agency

About this bridge

M-86 over Swan Creek is a prestressed concrete box beam or girders - single or spread carrying M-86 over Swan Creek in St. Joseph County, Michigan. It was built in 2008, so it is 17 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 4,063 vehicles a day, roughly 3% of them trucks, projected to reach 9,200 by 2025. The structure is 85 ft (25.8 m) long and 55 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesM-86
CrossesSwan Creek
LocationIn Colon
RouteState Highway 86
CountySt. Joseph County
StateMichigan
Coordinates41.9584, -85.32333
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.2 US tons
Inventory rating24.7 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length85 ft (25.8 m)
Longest span85 ft (25.8 m)
Deck width55 ft (16.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,063 (2007)
Projected traffic9,200 by 2025
Trucks3%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 M-86 over Swan Creek built?

It was built in 2008, making it 17 years old in 2025.

What condition is M-86 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 M-86 over Swan Creek carry?

About 4,063 vehicles per day (2007 count), of which roughly 3% are trucks.

How long is M-86 over Swan Creek?

The structure is 85 ft (25.8 m) long with a longest span of 85 ft (25.8 m) and a deck 55 ft wide.

Who owns M-86 over Swan Creek?

It is owned by the State Highway Agency.