US Bridges

M-28 over W Br Ontonagon River

Fair

Ontonagon County, Michigan · 2.3 MI E of E JCT M-64 · Structure no. 000000000008486

Built
1965
60 years old, rebuilt 1997
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
188 ft
3 main spans
Daily traffic
1,331
2007 count
Owner
State
State Highway Agency

About this bridge

M-28 over W Br Ontonagon River is a steel stringer/multi-beam or girder carrying M-28 over W Br Ontonagon River in Ontonagon County, Michigan. It was built in 1965 and reconstructed in 1997, so it is 60 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 1,331 vehicles a day, roughly 19% of them trucks, projected to reach 1,756 by 2018. The structure is 188 ft (57.4 m) long and 47 ft wide. If it were closed, the detour would be 57.8 mi (93 km).

Location

Open in Google Maps
CarriesM-28
CrossesW Br Ontonagon River
Location2.3 MI E of E JCT M-64
RouteState Highway 28
CountyOntonagon County
StateMichigan
Coordinates46.58928, -89.52674
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating67.5 US tons
Inventory rating40.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length188 ft (57.4 m)
Longest span73 ft (22.4 m)
Deck width47 ft (14.2 m)
Roadway width43 ft (13.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,331 (2007)
Projected traffic1,756 by 2018
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed57.8 mi (93 km)
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was M-28 over W Br Ontonagon River built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1997.

What condition is M-28 over W Br Ontonagon 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 August 2023.

How much traffic does M-28 over W Br Ontonagon River carry?

About 1,331 vehicles per day (2007 count), of which roughly 19% are trucks.

How long is M-28 over W Br Ontonagon River?

The structure is 188 ft (57.4 m) long with a longest span of 73 ft (22.4 m) and a deck 47 ft wide.

Who owns M-28 over W Br Ontonagon River?

It is owned by the State Highway Agency.