US Bridges

M-28|9 Mile RD over I-75 NB

Fair

Chippewa County, Michigan · @I-75 M-28 JCT · Structure no. 000000000001581

Built
1963
62 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
230 ft
4 main spans
Daily traffic
2,956
2007 count
Owner
State
State Highway Agency

About this bridge

M-28|9 Mile RD over I-75 NB is a steel stringer/multi-beam or girder carrying M-28|9 Mile RD over I-75 NB in Chippewa County, Michigan. It was built in 1963, so it is 62 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 2,956 vehicles a day, roughly 15% of them trucks, projected to reach 1,636 by 2018. The structure is 230 ft (70.2 m) long and 51 ft wide.

Location

Open in Google Maps
CarriesM-28|9 Mile RD
CrossesI-75 NB
Location@I-75 M-28 JCT
RouteState Highway 28
CountyChippewa County
StateMichigan
Coordinates46.37456, -84.41392
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating95.3 US tons
Inventory rating57.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length230 ft (70.2 m)
Longest span83 ft (25.3 m)
Deck width51 ft (15.4 m)
Roadway width47 ft (14.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,956 (2007)
Projected traffic1,636 by 2018
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedDeck replacement with only incidental widening
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was M-28|9 Mile RD over I-75 NB built?

It was built in 1963, making it 62 years old in 2025.

What condition is M-28|9 Mile 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 M-28|9 Mile RD over I-75 NB carry?

About 2,956 vehicles per day (2007 count), of which roughly 15% are trucks.

How long is M-28|9 Mile RD over I-75 NB?

The structure is 230 ft (70.2 m) long with a longest span of 83 ft (25.3 m) and a deck 51 ft wide.

Who owns M-28|9 Mile RD over I-75 NB?

It is owned by the State Highway Agency.