US Bridges

Bamfield Road FH08 over Au Sable River

Fair

Alcona County, Michigan · 4 MI W of Glennie · Structure no. 000000000000009

Built
1978
47 years old
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
220 ft
4 main spans
Daily traffic
1,366
2019 count
Owner
County
County Highway Agency

About this bridge

Bamfield Road FH08 over Au Sable River is a prestressed concrete box beam or girders - multiple carrying Bamfield Road FH08 over Au Sable River in Alcona County, Michigan. It was built in 1978, so it is 47 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 5 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 1,366 vehicles a day, roughly 5% of them trucks, projected to reach 1,667 by 2039. The structure is 220 ft (67.1 m) long and 31 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

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CarriesBamfield Road FH08
CrossesAu Sable River
Location4 MI W of Glennie
RouteCounty Highway 120
CountyAlcona County
StateMichigan
Coordinates44.56061, -83.80331
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.8 US tons
Inventory rating42.9 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans4
Design loadHS 20
Structure length220 ft (67.1 m)
Longest span55 ft (16.7 m)
Deck width31 ft (9.3 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,366 (2019)
Projected traffic1,667 by 2039
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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 Bamfield Road FH08 over Au Sable River built?

It was built in 1978, making it 47 years old in 2025.

What condition is Bamfield Road FH08 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 Bamfield Road FH08 over Au Sable River carry?

About 1,366 vehicles per day (2019 count), of which roughly 5% are trucks.

How long is Bamfield Road FH08 over Au Sable River?

The structure is 220 ft (67.1 m) long with a longest span of 55 ft (16.7 m) and a deck 31 ft wide.

Who owns Bamfield Road FH08 over Au Sable River?

It is owned by the County Highway Agency.