US Bridges

No 29 1/2 Road over Manistee River

Fair

Wexford County, Michigan · Section 9 T24N R10W · Structure no. 000000000012578

Built
1985
40 years old
Condition
Fair
inspected July 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
168 ft
2 main spans
Daily traffic
786
2005 count
Owner
County
County Highway Agency

About this bridge

No 29 1/2 Road over Manistee River is a prestressed concrete box beam or girders - multiple carrying No 29 1/2 Road over Manistee River in Wexford County, Michigan. It was built in 1985, so it is 40 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 786 vehicles a day, projected to reach 1,420 by 2025. The structure is 168 ft (51.2 m) long and 40 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

Location

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CarriesNo 29 1/2 Road
CrossesManistee River
LocationSection 9 T24N R10W
RouteCounty Highway 8359
CountyWexford County
StateMichigan
Coordinates44.49298, -85.52736
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.
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 inspectionJuly 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 geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating45.7 US tons
Inventory rating29.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length168 ft (51.2 m)
Longest span97 ft (29.5 m)
Deck width40 ft (12.3 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic786 (2005)
Projected traffic1,420 by 2025
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.8 mi (48 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 No 29 1/2 Road over Manistee River built?

It was built in 1985, making it 40 years old in 2025.

What condition is No 29 1/2 Road over Manistee 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 July 2024.

How much traffic does No 29 1/2 Road over Manistee River carry?

About 786 vehicles per day (2005 count).

How long is No 29 1/2 Road over Manistee River?

The structure is 168 ft (51.2 m) long with a longest span of 97 ft (29.5 m) and a deck 40 ft wide.

Who owns No 29 1/2 Road over Manistee River?

It is owned by the County Highway Agency.