US Bridges

M-68 over Trout River

Fair

Presque Isle County, Michigan · 2.2 MI W of US-23 · Structure no. 000000000008955

Built
1956
69 years old
Condition
Fair
inspected May 2023
Type
Tee Beam
Concrete
Length
39 ft
1 main span
Daily traffic
1,564
2007 count
Owner
State
State Highway Agency

About this bridge

M-68 over Trout River is a concrete tee beam carrying M-68 over Trout River in Presque Isle County, Michigan. It was built in 1956, so it is 69 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 5 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 1,564 vehicles a day, roughly 5% of them trucks, projected to reach 2,274 by 2018. The structure is 39 ft (11.8 m) long and 44 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesM-68
CrossesTrout River
Location2.2 MI W of US-23
RouteState Highway 68
CountyPresque Isle County
StateMichigan
Coordinates45.40218, -83.87816
Functional classRural Minor 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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating66.5 US tons
Inventory rating39.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length39 ft (11.8 m)
Longest span34 ft (10.5 m)
Deck width44 ft (13.4 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,564 (2007)
Projected traffic2,274 by 2018
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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-68 over Trout River built?

It was built in 1956, making it 69 years old in 2025.

What condition is M-68 over Trout River 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 May 2023.

How much traffic does M-68 over Trout River carry?

About 1,564 vehicles per day (2007 count), of which roughly 5% are trucks.

How long is M-68 over Trout River?

The structure is 39 ft (11.8 m) long with a longest span of 34 ft (10.5 m) and a deck 44 ft wide.

Who owns M-68 over Trout River?

It is owned by the State Highway Agency.