US Bridges

Kenneth Road over N. Branch Carp River

Fair

Mackinac County, Michigan · 3 M S & 5 M E of Ozark · Structure no. 091005000001046

Built
1979
46 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
29 ft
1 main span
Daily traffic
125
1998 count
Owner
Federal
U.S. Forest Service

About this bridge

Kenneth Road over N. Branch Carp River is a wood or timber stringer/multi-beam or girder carrying Kenneth Road over N. Branch Carp River in Mackinac County, Michigan. It was built in 1979, so it is 46 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 125 vehicles a day, roughly 10% of them trucks, projected to reach 150 by 2018. The structure is 29 ft (8.8 m) long and 16 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

Location

Open in Google Maps
CarriesKenneth Road
CrossesN. Branch Carp River
Location3 M S & 5 M E of Ozark
RouteFederal Lands Road 3122
CountyMackinac County
StateMichigan
Coordinates46.10047, -84.85253
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.5 US tons
Inventory rating20.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 25 or greater
Structure length29 ft (8.8 m)
Longest span27 ft (8.2 m)
Deck width16 ft (4.9 m)
Roadway width14 ft (4.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic125 (1998)
Projected traffic150 by 2018
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.7 mi (35 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$15,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Kenneth Road over N. Branch Carp River built?

It was built in 1979, making it 46 years old in 2025.

What condition is Kenneth Road over N. Branch Carp 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 October 2024.

How much traffic does Kenneth Road over N. Branch Carp River carry?

About 125 vehicles per day (1998 count), of which roughly 10% are trucks.

How long is Kenneth Road over N. Branch Carp River?

The structure is 29 ft (8.8 m) long with a longest span of 27 ft (8.2 m) and a deck 16 ft wide.

Who owns Kenneth Road over N. Branch Carp River?

It is owned by the U.S. Forest Service.