US Bridges

M-28 over Anna River

Fair

Alger County, Michigan · In Munising · Structure no. 000000000000049

Built
1949
76 years old, rebuilt 2013
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
39 ft
1 main span
Daily traffic
7,171
2013 count
Owner
State
State Highway Agency

About this bridge

M-28 over Anna River is a steel stringer/multi-beam or girder carrying M-28 over Anna River in Alger County, Michigan. It was built in 1949 and reconstructed in 2013, so it is 76 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 6 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 7,171 vehicles a day, roughly 5% of them trucks, projected to reach 8,003 by 2033. The structure is 39 ft (11.9 m) long and 44 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesM-28
CrossesAnna River
LocationIn Munising
RouteState Highway 28
CountyAlger County
StateMichigan
Coordinates46.4032, -86.64832
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating69.7 US tons
Inventory rating41.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length39 ft (11.9 m)
Longest span37 ft (11.3 m)
Deck width44 ft (13.3 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,171 (2013)
Projected traffic8,003 by 2033
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Anna River built?

It was built in 1949, making it 76 years old in 2025. It was reconstructed in 2013.

What condition is M-28 over Anna 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 May 2024.

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

About 7,171 vehicles per day (2013 count), of which roughly 5% are trucks.

How long is M-28 over Anna River?

The structure is 39 ft (11.9 m) long with a longest span of 37 ft (11.3 m) and a deck 44 ft wide.

Who owns M-28 over Anna River?

It is owned by the State Highway Agency.