US Bridges

Griswold Road over Pine River

Fair

St. Clair County, Michigan · Sec. 8-17 Kimball Twp. · Structure no. 000000000010064

Built
1925
100 years old
Condition
Fair
inspected December 2023
Type
Girder and Floorbeam System
Concrete
Length
90 ft
1 main span
Daily traffic
1,410
2000 count
Owner
County
County Highway Agency

About this bridge

Griswold Road over Pine River is a concrete girder and floorbeam system carrying Griswold Road over Pine River in St. Clair County, Michigan. It was built in 1925, so it is 100 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 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 1,410 vehicles a day, roughly 5% of them trucks, projected to reach 2,550 by 2020. The structure is 90 ft (27.4 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesGriswold Road
CrossesPine River
LocationSec. 8-17 Kimball Twp.
RouteCounty Highway 7768
CountySt. Clair County
StateMichigan
Coordinates42.96192, -82.59387
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2023
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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating89 US tons
Inventory rating53.2 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length90 ft (27.4 m)
Longest span84 ft (25.6 m)
Deck width28 ft (8.4 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,410 (2000)
Projected traffic2,550 by 2020
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Griswold Road over Pine River built?

It was built in 1925, making it 100 years old in 2025.

What condition is Griswold Road over Pine 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 December 2023.

How much traffic does Griswold Road over Pine River carry?

About 1,410 vehicles per day (2000 count), of which roughly 5% are trucks.

How long is Griswold Road over Pine River?

The structure is 90 ft (27.4 m) long with a longest span of 84 ft (25.6 m) and a deck 28 ft wide.

Who owns Griswold Road over Pine River?

It is owned by the County Highway Agency.