US Bridges

M-28 over Chocolay River

Good

Marquette County, Michigan · 1.1 MI E of US-41 · Structure no. 000000000006519

Built
2005
20 years old
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
134 ft
3 main spans
Daily traffic
9,335
2007 count
Owner
State
State Highway Agency

About this bridge

M-28 over Chocolay River is a prestressed concrete stringer/multi-beam or girder carrying M-28 over Chocolay River in Marquette County, Michigan. It was built in 2005, so it is 20 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 9,335 vehicles a day, roughly 4% of them trucks, projected to reach 10,301 by 2018. The structure is 134 ft (40.8 m) long and 47 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesM-28
CrossesChocolay River
Location1.1 MI E of US-41
RouteState Highway 28
CountyMarquette County
StateMichigan
Coordinates46.48907, -87.32836
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating67.1 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length134 ft (40.8 m)
Longest span53 ft (16.2 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,335 (2007)
Projected traffic10,301 by 2018
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 proposedDeck replacement with only incidental widening
Estimated improvement cost$60,000
NavigationNo navigation control on waterway

Frequently asked questions

When was M-28 over Chocolay River built?

It was built in 2005, making it 20 years old in 2025.

What condition is M-28 over Chocolay River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2024.

How much traffic does M-28 over Chocolay River carry?

About 9,335 vehicles per day (2007 count), of which roughly 4% are trucks.

How long is M-28 over Chocolay River?

The structure is 134 ft (40.8 m) long with a longest span of 53 ft (16.2 m) and a deck 47 ft wide.

Who owns M-28 over Chocolay River?

It is owned by the State Highway Agency.