US Bridges

7th Avenue over Iron River

GoodPosted for load

Iron County, Michigan · 1800 Ft N of US-2 · Structure no. 000000000004219

Built
1987
38 years old
Condition
Good
inspected September 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
60 ft
1 main span
Daily traffic
400
1990 count
Owner
City
City or Municipal Highway Agency

About this bridge

7th Avenue over Iron River is a prestressed concrete box beam or girders - multiple carrying 7th Avenue over Iron River in Iron County, Michigan. It was built in 1987, so it is 38 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. Its operating status is: posted for load restriction.

It carries about 400 vehicles a day, roughly 15% of them trucks, projected to reach 460 by 2010. The structure is 60 ft (18.2 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Carries7th Avenue
CrossesIron River
Location1800 Ft N of US-2
RouteCity Street 0
Coordinates46.09725, -88.64605
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating27.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length60 ft (18.2 m)
Longest span60 ft (18.2 m)
Deck width40 ft (12.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (1990)
Projected traffic460 by 2010
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 7th Avenue over Iron River built?

It was built in 1987, making it 38 years old in 2025.

What condition is 7th Avenue over Iron 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 September 2024.

How much traffic does 7th Avenue over Iron River carry?

About 400 vehicles per day (1990 count), of which roughly 15% are trucks.

How long is 7th Avenue over Iron River?

The structure is 60 ft (18.2 m) long with a longest span of 60 ft (18.2 m) and a deck 40 ft wide.

Who owns 7th Avenue over Iron River?

It is owned by the City or Municipal Highway Agency.