US Bridges

US-141|M 28 over Rock River

Fair

Baraga County, Michigan · 3.0 MI NE of Covington · Structure no. 000000000000492

Built
1955
70 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
109 ft
2 main spans
Daily traffic
2,145
2007 count
Owner
State
State Highway Agency

About this bridge

US-141|M 28 over Rock River is a steel stringer/multi-beam or girder carrying US-141|M 28 over Rock River in Baraga County, Michigan. It was built in 1955, so it is 70 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 2,145 vehicles a day, roughly 20% of them trucks, projected to reach 2,968 by 2018. The structure is 109 ft (33.2 m) long and 34 ft wide. If it were closed, the detour would be 49.7 mi (80 km).

Location

Open in Google Maps
CarriesUS-141|M 28
CrossesRock River
Location3.0 MI NE of Covington
RouteU.S. Route 141
CountyBaraga County
StateMichigan
Coordinates46.57298, -88.49443
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 protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating75.7 US tons
Inventory rating45.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length109 ft (33.2 m)
Longest span53 ft (16.2 m)
Deck width34 ft (10.3 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,145 (2007)
Projected traffic2,968 by 2018
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed49.7 mi (80 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was US-141|M 28 over Rock River built?

It was built in 1955, making it 70 years old in 2025.

What condition is US-141|M 28 over Rock 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 September 2023.

How much traffic does US-141|M 28 over Rock River carry?

About 2,145 vehicles per day (2007 count), of which roughly 20% are trucks.

How long is US-141|M 28 over Rock River?

The structure is 109 ft (33.2 m) long with a longest span of 53 ft (16.2 m) and a deck 34 ft wide.

Who owns US-141|M 28 over Rock River?

It is owned by the State Highway Agency.