US Bridges

Topinabee Mail RTE over I-75 NB

PoorPosted for load

Cheboygan County, Michigan · 2.8 MI N of M-27 · Structure no. 000000000001512

Built
1960
65 years old
Condition
Poor
inspected September 2024
Type
Tee Beam
Concrete Continuous
Length
379 ft
4 main spans
Daily traffic
550
1997 count
Owner
State
State Highway Agency

About this bridge

Topinabee Mail RTE over I-75 NB is a concrete continuous tee beam carrying Topinabee Mail RTE over I-75 NB in Cheboygan County, Michigan. It was built in 1960, so it is 65 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 550 vehicles a day, roughly 3% of them trucks, projected to reach 900 by 2007. The structure is 379 ft (115.5 m) long and 31 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesTopinabee Mail RTE
CrossesI-75 NB
Location2.8 MI N of M-27
RouteCounty Highway 0
CountyCheboygan County
StateMichigan
Coordinates45.49794, -84.61554
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating52.9 US tons
Inventory rating31.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length379 ft (115.5 m)
Longest span118 ft (36.1 m)
Deck width31 ft (9.6 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic550 (1997)
Projected traffic900 by 2007
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Topinabee Mail RTE over I-75 NB built?

It was built in 1960, making it 65 years old in 2025.

What condition is Topinabee Mail RTE over I-75 NB in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2024.

How much traffic does Topinabee Mail RTE over I-75 NB carry?

About 550 vehicles per day (1997 count), of which roughly 3% are trucks.

How long is Topinabee Mail RTE over I-75 NB?

The structure is 379 ft (115.5 m) long with a longest span of 118 ft (36.1 m) and a deck 31 ft wide.

Who owns Topinabee Mail RTE over I-75 NB?

It is owned by the State Highway Agency.