US Bridges

Rattle Run Road over Pine River

Good

St. Clair County, Michigan · Pvt Clm #307 ST Clair Twp · Structure no. 000000000010051

Built
1931
94 years old, rebuilt 2004
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
120 ft
2 main spans
Daily traffic
2,830
2001 count
Owner
County
County Highway Agency

About this bridge

Rattle Run Road over Pine River is a steel continuous stringer/multi-beam or girder carrying Rattle Run Road over Pine River in St. Clair County, Michigan. It was built in 1931 and reconstructed in 2004, 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,830 vehicles a day, roughly 5% of them trucks, projected to reach 5,111 by 2021. The structure is 120 ft (36.6 m) long and 37 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesRattle Run Road
CrossesPine River
LocationPvt Clm #307 ST Clair Twp
RouteCounty Highway 7748
Coordinates42.82279, -82.51777
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating107.1 US tons
Inventory rating82.9 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length120 ft (36.6 m)
Longest span60 ft (18.3 m)
Deck width37 ft (11.3 m)
Roadway width35 ft (10.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,830 (2001)
Projected traffic5,111 by 2021
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Rattle Run Road over Pine River built?

It was built in 1931, making it 94 years old in 2025. It was reconstructed in 2004.

What condition is Rattle Run Road over Pine River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2023.

How much traffic does Rattle Run Road over Pine River carry?

About 2,830 vehicles per day (2001 count), of which roughly 5% are trucks.

How long is Rattle Run Road over Pine River?

The structure is 120 ft (36.6 m) long with a longest span of 60 ft (18.3 m) and a deck 37 ft wide.

Who owns Rattle Run Road over Pine River?

It is owned by the County Highway Agency.