US Bridges

Rynn Road over Pine River

Fair

St. Clair County, Michigan · Sec. 30-31 Clyde Twp. · Structure no. 000000000010146

Built
1981
44 years old
Condition
Fair
inspected April 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
75 ft
1 main span
Daily traffic
135
1994 count
Owner
County
County Highway Agency

About this bridge

Rynn Road over Pine River is a prestressed concrete box beam or girders - multiple carrying Rynn Road over Pine River in St. Clair County, Michigan. It was built in 1981, so it is 44 years old, younger 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 135 vehicles a day, roughly 3% of them trucks, projected to reach 150 by 2014. The structure is 75 ft (22.9 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesRynn Road
CrossesPine River
LocationSec. 30-31 Clyde Twp.
RouteCounty Highway 0
CountySt. Clair County
StateMichigan
Coordinates43.00556, -82.62487
Functional classRural Local

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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 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 alignment6: Equal to present minimum criteria
Operating rating76.4 US tons
Inventory rating45.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length75 ft (22.9 m)
Longest span73 ft (22.4 m)
Deck width31 ft (9.4 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic135 (1994)
Projected traffic150 by 2014
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 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 Rynn Road over Pine River built?

It was built in 1981, making it 44 years old in 2025.

What condition is Rynn 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 April 2023.

How much traffic does Rynn Road over Pine River carry?

About 135 vehicles per day (1994 count), of which roughly 3% are trucks.

How long is Rynn Road over Pine River?

The structure is 75 ft (22.9 m) long with a longest span of 73 ft (22.4 m) and a deck 31 ft wide.

Who owns Rynn Road over Pine River?

It is owned by the County Highway Agency.