US Bridges

US-23 over Cheboygan River

Fair

Cheboygan County, Michigan · In Cheboygan (state St) · Structure no. 000000000001501

Built
1940
85 years old, rebuilt 2003
Condition
Fair
inspected May 2024
Type
Movable - Bascule
Steel
Length
169 ft
1 main span
Daily traffic
7,273
2021 count
Owner
State
State Highway Agency

About this bridge

US-23 over Cheboygan River is a steel movable - bascule carrying US-23 over Cheboygan River in Cheboygan County, Michigan. It was built in 1940 and reconstructed in 2003, so it is 85 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 7,273 vehicles a day, roughly 1% of them trucks, projected to reach 7,824 by 2034. The structure is 169 ft (51.5 m) long and 52 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesUS-23
CrossesCheboygan River
LocationIn Cheboygan (state St)
RouteU.S. Route 23
Coordinates45.64586, -84.47254
Functional classRural Principal Arterial - Other

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 protection7 GoodSome minor problems.
Last inspectionMay 2024
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating53.6 US tons
Inventory rating32.2 US tons

Structure

Structure typeMovable - Bascule
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadH 20
Structure length169 ft (51.5 m)
Longest span70 ft (21.3 m)
Deck width52 ft (15.7 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,273 (2021)
Projected traffic7,824 by 2034
Trucks1%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was US-23 over Cheboygan River built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 2003.

What condition is US-23 over Cheboygan 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 2024.

How much traffic does US-23 over Cheboygan River carry?

About 7,273 vehicles per day (2021 count), of which roughly 1% are trucks.

How long is US-23 over Cheboygan River?

The structure is 169 ft (51.5 m) long with a longest span of 70 ft (21.3 m) and a deck 52 ft wide.

Who owns US-23 over Cheboygan River?

It is owned by the State Highway Agency.