US Bridges

M-115 over Cadillac Canal

Fair

Wexford County, Michigan · @ Cadillac State Park · Structure no. 000000000012573

Built
1957
68 years old, rebuilt 2007
Condition
Fair
inspected August 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
32 ft
1 main span
Daily traffic
12,589
2019 count
Owner
State
State Highway Agency

About this bridge

M-115 over Cadillac Canal is a prestressed concrete box beam or girders - multiple carrying M-115 over Cadillac Canal in Wexford County, Michigan. It was built in 1957 and reconstructed in 2007, so it is 68 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.

It carries about 12,589 vehicles a day, roughly 8% of them trucks, projected to reach 14,477 by 2039. The structure is 32 ft (9.9 m) long and 85 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesM-115
CrossesCadillac Canal
Location@ Cadillac State Park
RouteState Highway 115
CountyWexford County
StateMichigan
Coordinates44.23939, -85.45528
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating76.8 US tons
Inventory rating46.1 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length32 ft (9.9 m)
Longest span31 ft (9.4 m)
Deck width85 ft (26 m)
Roadway width68 ft (20.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,589 (2019)
Projected traffic14,477 by 2039
Trucks8%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemYes

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-115 over Cadillac Canal built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 2007.

What condition is M-115 over Cadillac Canal 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 August 2024.

How much traffic does M-115 over Cadillac Canal carry?

About 12,589 vehicles per day (2019 count), of which roughly 8% are trucks.

How long is M-115 over Cadillac Canal?

The structure is 32 ft (9.9 m) long with a longest span of 31 ft (9.4 m) and a deck 85 ft wide.

Who owns M-115 over Cadillac Canal?

It is owned by the State Highway Agency.