US Bridges

Frith Road over Pine River

Good

St. Clair County, Michigan · Sec 4-9 ST Clair Twp · Structure no. 000000000010229

Built
2006
19 years old
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
220 ft
3 main spans
Daily traffic
440
2004 count
Owner
County
County Highway Agency

About this bridge

Frith Road over Pine River is a prestressed concrete stringer/multi-beam or girder carrying Frith Road over Pine River in St. Clair County, Michigan. It was built in 2006, so it is 19 years old, younger 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 440 vehicles a day, roughly 3% of them trucks, projected to reach 790 by 2024. The structure is 220 ft (67.1 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesFrith Road
CrossesPine River
LocationSec 4-9 ST Clair Twp
RouteCounty Highway 0
CountySt. Clair County
StateMichigan
Coordinates42.8888, -82.56867
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
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 geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.8 US tons
Inventory rating59.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length220 ft (67.1 m)
Longest span108 ft (32.9 m)
Deck width32 ft (9.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic440 (2004)
Projected traffic790 by 2024
Trucks3%
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 statusListed on the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Frith Road over Pine River built?

It was built in 2006, making it 19 years old in 2025.

What condition is Frith 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 Frith Road over Pine River carry?

About 440 vehicles per day (2004 count), of which roughly 3% are trucks.

How long is Frith Road over Pine River?

The structure is 220 ft (67.1 m) long with a longest span of 108 ft (32.9 m) and a deck 32 ft wide.

Who owns Frith Road over Pine River?

It is owned by the County Highway Agency.