US Bridges

Old Mackinac Trail over Pine River

PoorPosted for load

Chippewa County, Michigan · 3 MI S of Rudyard · Structure no. 000000000001636

Built
1931
94 years old, rebuilt 1966
Condition
Poor
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
228 ft
7 main spans
Daily traffic
216
1986 count
Owner
County
County Highway Agency

About this bridge

Old Mackinac Trail over Pine River is a steel continuous stringer/multi-beam or girder carrying Old Mackinac Trail over Pine River in Chippewa County, Michigan. It was built in 1931 and reconstructed in 1966, so it is 94 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 216 vehicles a day, projected to reach 375 by 2019. The structure is 228 ft (69.5 m) long and 37 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesOld Mackinac Trail
CrossesPine River
Location3 MI S of Rudyard
RouteCounty Highway 1724
Coordinates46.18599, -84.59787
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be 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 rating48.6 US tons
Inventory rating28.9 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadH 15
Structure length228 ft (69.5 m)
Longest span60 ft (18.2 m)
Deck width37 ft (11.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic216 (1986)
Projected traffic375 by 2019
Trucks0%
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 Old Mackinac Trail over Pine River built?

It was built in 1931, making it 94 years old in 2025. It was reconstructed in 1966.

What condition is Old Mackinac Trail over Pine River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2024.

How much traffic does Old Mackinac Trail over Pine River carry?

About 216 vehicles per day (1986 count).

How long is Old Mackinac Trail over Pine River?

The structure is 228 ft (69.5 m) long with a longest span of 60 ft (18.2 m) and a deck 37 ft wide.

Who owns Old Mackinac Trail over Pine River?

It is owned by the County Highway Agency.