US Bridges

Autrinforest Lk RD over Au Train River

Fair

Alger County, Michigan · 0.66 MI S of Au Train · Structure no. 000000000000059

Built
1980
45 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
72 ft
1 main span
Daily traffic
682
1995 count
Owner
County
County Highway Agency

About this bridge

Autrinforest Lk RD over Au Train River is a prestressed concrete stringer/multi-beam or girder carrying Autrinforest Lk RD over Au Train River in Alger County, Michigan. It was built in 1980, so it is 45 years old, younger 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 682 vehicles a day, projected to reach 1,200 by 2015. The structure is 72 ft (21.9 m) long and 36 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

Location

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CarriesAutrinforest Lk RD
CrossesAu Train River
Location0.66 MI S of Au Train
RouteCounty Highway 219
CountyAlger County
StateMichigan
Coordinates46.42362, -86.83619
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
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
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 rating36 US tons
Inventory rating35.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length72 ft (21.9 m)
Longest span68 ft (20.7 m)
Deck width36 ft (11.1 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic682 (1995)
Projected traffic1,200 by 2015
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.7 mi (35 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Autrinforest Lk RD over Au Train River built?

It was built in 1980, making it 45 years old in 2025.

What condition is Autrinforest Lk RD over Au Train 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 Autrinforest Lk RD over Au Train River carry?

About 682 vehicles per day (1995 count).

How long is Autrinforest Lk RD over Au Train River?

The structure is 72 ft (21.9 m) long with a longest span of 68 ft (20.7 m) and a deck 36 ft wide.

Who owns Autrinforest Lk RD over Au Train River?

It is owned by the County Highway Agency.