US Bridges

Dunn Road over Pigeon River

Fair

Huron County, Michigan · Sec. 12 Caseville Twp. · Structure no. 000000000003577

Built
1980
45 years old
Condition
Fair
inspected September 2023
Type
Tee Beam
Prestressed Concrete
Length
80 ft
2 main spans
Daily traffic
130
2009 count
Owner
County
County Highway Agency

About this bridge

Dunn Road over Pigeon River is a prestressed concrete tee beam carrying Dunn Road over Pigeon River in Huron County, Michigan. It was built in 1980, so it is 45 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 130 vehicles a day, roughly 1% of them trucks, projected to reach 235 by 2029. The structure is 80 ft (24.3 m) long and 32 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesDunn Road
CrossesPigeon River
LocationSec. 12 Caseville Twp.
RouteCounty Highway 0
CountyHuron County
StateMichigan
Coordinates43.90257, -83.25785
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 inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82.7 US tons
Inventory rating49.5 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length80 ft (24.3 m)
Longest span38 ft (11.6 m)
Deck width32 ft (9.9 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic130 (2009)
Projected traffic235 by 2029
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Dunn Road over Pigeon River built?

It was built in 1980, making it 45 years old in 2025.

What condition is Dunn Road over Pigeon 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 September 2023.

How much traffic does Dunn Road over Pigeon River carry?

About 130 vehicles per day (2009 count), of which roughly 1% are trucks.

How long is Dunn Road over Pigeon River?

The structure is 80 ft (24.3 m) long with a longest span of 38 ft (11.6 m) and a deck 32 ft wide.

Who owns Dunn Road over Pigeon River?

It is owned by the County Highway Agency.