US Bridges

M-28 over E Br Ontonagon River

Fair

Houghton County, Michigan · In Kenton · Structure no. 000000000003390

Built
1936
89 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
150 ft
3 main spans
Daily traffic
1,658
2012 count
Owner
State
State Highway Agency

About this bridge

M-28 over E Br Ontonagon River is a steel stringer/multi-beam or girder carrying M-28 over E Br Ontonagon River in Houghton County, Michigan. It was built in 1936, so it is 89 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 1,658 vehicles a day, roughly 17% of them trucks, projected to reach 1,841 by 2032. The structure is 150 ft (45.7 m) long and 43 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesM-28
CrossesE Br Ontonagon River
LocationIn Kenton
RouteState Highway 28
CountyHoughton County
StateMichigan
Coordinates46.48598, -88.88938
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating84.3 US tons
Inventory rating50.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length150 ft (45.7 m)
Longest span49 ft (14.9 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,658 (2012)
Projected traffic1,841 by 2032
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 E Br Ontonagon River built?

It was built in 1936, making it 89 years old in 2025.

What condition is M-28 over E 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 July 2023.

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

About 1,658 vehicles per day (2012 count), of which roughly 17% are trucks.

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

The structure is 150 ft (45.7 m) long with a longest span of 49 ft (14.9 m) and a deck 43 ft wide.

Who owns M-28 over E Br Ontonagon River?

It is owned by the State Highway Agency.