US Bridges

Onaway RD over I-75 NB

Fair

Cheboygan County, Michigan · 0.6 MI N of M-68 · Structure no. 000000000001509

Built
1962
63 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
196 ft
4 main spans
Daily traffic
1,050
1997 count
Owner
State
State Highway Agency

About this bridge

Onaway RD over I-75 NB is a steel stringer/multi-beam or girder carrying Onaway RD over I-75 NB in Cheboygan County, Michigan. It was built in 1962, so it is 63 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 1,050 vehicles a day, roughly 3% of them trucks, projected to reach 1,900 by 2007. The structure is 196 ft (59.7 m) long and 31 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesOnaway RD
CrossesI-75 NB
Location0.6 MI N of M-68
RouteCounty Highway 0
CountyCheboygan County
StateMichigan
Coordinates45.41119, -84.60481
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no 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 alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating59.6 US tons
Inventory rating31.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length196 ft (59.7 m)
Longest span61 ft (18.6 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,050 (1997)
Projected traffic1,900 by 2007
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed9.9 mi (16 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 Onaway RD over I-75 NB built?

It was built in 1962, making it 63 years old in 2025.

What condition is Onaway RD over I-75 NB 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 April 2023.

How much traffic does Onaway RD over I-75 NB carry?

About 1,050 vehicles per day (1997 count), of which roughly 3% are trucks.

How long is Onaway RD over I-75 NB?

The structure is 196 ft (59.7 m) long with a longest span of 61 ft (18.6 m) and a deck 31 ft wide.

Who owns Onaway RD over I-75 NB?

It is owned by the State Highway Agency.