US Bridges

Mackinac Trl. FH41 over Rabbits Back Creek

Fair

Mackinac County, Michigan · 1 MI N B L 75 on Cty RD 4 · Structure no. 000000000005984

Built
1930
95 years old
Condition
Fair
inspected October 2023
Type
Slab
Concrete
Length
21 ft
1 main span
Daily traffic
2,020
2015 count
Owner
County
County Highway Agency

About this bridge

Mackinac Trl. FH41 over Rabbits Back Creek is a concrete slab carrying Mackinac Trl. FH41 over Rabbits Back Creek in Mackinac County, Michigan. It was built in 1930, so it is 95 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 2,020 vehicles a day, roughly 7% of them trucks, projected to reach 2,300 by 2035. The structure is 21 ft (6.4 m) long and 41 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesMackinac Trl. FH41
CrossesRabbits Back Creek
Location1 MI N B L 75 on Cty RD 4
RouteCounty Highway 4963
CountyMackinac County
StateMichigan
Coordinates45.91985, -84.7345
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 inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating36 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length21 ft (6.4 m)
Longest span21 ft (6.4 m)
Deck width41 ft (12.6 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,020 (2015)
Projected traffic2,300 by 2035
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Mackinac Trl. FH41 over Rabbits Back Creek built?

It was built in 1930, making it 95 years old in 2025.

What condition is Mackinac Trl. FH41 over Rabbits Back Creek 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 2023.

How much traffic does Mackinac Trl. FH41 over Rabbits Back Creek carry?

About 2,020 vehicles per day (2015 count), of which roughly 7% are trucks.

How long is Mackinac Trl. FH41 over Rabbits Back Creek?

The structure is 21 ft (6.4 m) long with a longest span of 21 ft (6.4 m) and a deck 41 ft wide.

Who owns Mackinac Trl. FH41 over Rabbits Back Creek?

It is owned by the County Highway Agency.