US Bridges

Oak Beach Road over Pinnebog River

PoorPosted for load

Huron County, Michigan · Sec. 19-30 Hume Twp. · Structure no. 000000000003532

Built
1959
66 years old
Condition
Poor
inspected August 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
90 ft
2 main spans
Daily traffic
390
2009 count
Owner
County
County Highway Agency

About this bridge

Oak Beach Road over Pinnebog River is a prestressed concrete box beam or girders - multiple carrying Oak Beach Road over Pinnebog River in Huron County, Michigan. It was built in 1959, so it is 66 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 390 vehicles a day, projected to reach 700 by 2029. 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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CarriesOak Beach Road
CrossesPinnebog River
LocationSec. 19-30 Hume Twp.
RouteCounty Highway 3245
CountyHuron County
StateMichigan
Coordinates43.96436, -83.12158
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36.8 US tons
Inventory rating28.2 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadH 20
Structure length90 ft (27.4 m)
Longest span44 ft (13.3 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic390 (2009)
Projected traffic700 by 2029
Trucks0%
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 Oak Beach Road over Pinnebog River built?

It was built in 1959, making it 66 years old in 2025.

What condition is Oak Beach Road over Pinnebog River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.

How much traffic does Oak Beach Road over Pinnebog River carry?

About 390 vehicles per day (2009 count).

How long is Oak Beach Road over Pinnebog River?

The structure is 90 ft (27.4 m) long with a longest span of 44 ft (13.3 m) and a deck 28 ft wide.

Who owns Oak Beach Road over Pinnebog River?

It is owned by the County Highway Agency.