US Bridges

Keehn Road over Clam River

Fair

Clare County, Michigan · Winterfield Twp Sec 3 · Structure no. 000000000001777

Built
1974
51 years old
Condition
Fair
inspected June 2024
Type
Tee Beam
Prestressed Concrete
Length
78 ft
2 main spans
Daily traffic
490
2006 count
Owner
County
County Highway Agency

About this bridge

Keehn Road over Clam River is a prestressed concrete tee beam carrying Keehn Road over Clam River in Clare County, Michigan. It was built in 1974, so it is 51 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 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 490 vehicles a day, projected to reach 880 by 2026. The structure is 78 ft (23.7 m) long and 32 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesKeehn Road
CrossesClam River
LocationWinterfield Twp Sec 3
RouteCounty Highway 0
CountyClare County
StateMichigan
Coordinates44.15368, -85.0141
Functional classRural Local

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJune 2024
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.2 US tons
Inventory rating31.3 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length78 ft (23.7 m)
Longest span37 ft (11.2 m)
Deck width32 ft (9.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic490 (2006)
Projected traffic880 by 2026
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Keehn Road over Clam River built?

It was built in 1974, making it 51 years old in 2025.

What condition is Keehn Road over Clam 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 June 2024.

How much traffic does Keehn Road over Clam River carry?

About 490 vehicles per day (2006 count).

How long is Keehn Road over Clam River?

The structure is 78 ft (23.7 m) long with a longest span of 37 ft (11.2 m) and a deck 32 ft wide.

Who owns Keehn Road over Clam River?

It is owned by the County Highway Agency.