US Bridges

M-68|M-33 over Black River

Fair

Cheboygan County, Michigan · E Lts of Tower · Structure no. 000000000001490

Built
2002
23 years old
Condition
Fair
inspected June 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
84 ft
1 main span
Daily traffic
3,521
2007 count
Owner
State
State Highway Agency

About this bridge

M-68|M-33 over Black River is a prestressed concrete box beam or girders - multiple carrying M-68|M-33 over Black River in Cheboygan County, Michigan. It was built in 2002, so it is 23 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 3,521 vehicles a day, roughly 9% of them trucks, projected to reach 4,430 by 2018. The structure is 84 ft (25.7 m) long and 50 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

Location

Open in Google Maps
CarriesM-68|M-33
CrossesBlack River
LocationE Lts of Tower
RouteState Highway 68
CountyCheboygan County
StateMichigan
Coordinates45.35513, -84.2917
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating104.6 US tons
Inventory rating44 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length84 ft (25.7 m)
Longest span84 ft (25.5 m)
Deck width50 ft (15.3 m)
Roadway width47 ft (14.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,521 (2007)
Projected traffic4,430 by 2018
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.3 mi (31 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|M-33 over Black River built?

It was built in 2002, making it 23 years old in 2025.

What condition is M-68|M-33 over Black 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 June 2023.

How much traffic does M-68|M-33 over Black River carry?

About 3,521 vehicles per day (2007 count), of which roughly 9% are trucks.

How long is M-68|M-33 over Black River?

The structure is 84 ft (25.7 m) long with a longest span of 84 ft (25.5 m) and a deck 50 ft wide.

Who owns M-68|M-33 over Black River?

It is owned by the State Highway Agency.