US Bridges

F4001 FH10 over Au Sable River

Fair

Alcona County, Michigan · 5 MI W 4 MI N of Glennie · Structure no. 000000000000019

Built
1970
55 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
195 ft
3 main spans
Daily traffic
307
2003 count
Owner
County
County Highway Agency

About this bridge

F4001 FH10 over Au Sable River is a steel continuous stringer/multi-beam or girder carrying F4001 FH10 over Au Sable River in Alcona County, Michigan. It was built in 1970, so it is 55 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 307 vehicles a day, projected to reach 414 by 2023. The structure is 195 ft (59.4 m) long and 35 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

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CarriesF4001 FH10
CrossesAu Sable River
Location5 MI W 4 MI N of Glennie
RouteCounty Highway 126
CountyAlcona County
StateMichigan
Coordinates44.61276, -83.83655
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
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 inspectionMay 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.2 US tons
Inventory rating39.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length195 ft (59.4 m)
Longest span87 ft (26.5 m)
Deck width35 ft (10.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic307 (2003)
Projected traffic414 by 2023
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 F4001 FH10 over Au Sable River built?

It was built in 1970, making it 55 years old in 2025.

What condition is F4001 FH10 over Au Sable 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 2023.

How much traffic does F4001 FH10 over Au Sable River carry?

About 307 vehicles per day (2003 count).

How long is F4001 FH10 over Au Sable River?

The structure is 195 ft (59.4 m) long with a longest span of 87 ft (26.5 m) and a deck 35 ft wide.

Who owns F4001 FH10 over Au Sable River?

It is owned by the County Highway Agency.