US Bridges

Quarterline Road over Big Sauble River

FairPosted for load

Mason County, Michigan · 1.6 MI N of Town Line RD · Structure no. 000000000006661

Built
1966
59 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
64 ft
2 main spans
Daily traffic
2,000
1997 count
Owner
County
County Highway Agency

About this bridge

Quarterline Road over Big Sauble River is a wood or timber stringer/multi-beam or girder carrying Quarterline Road over Big Sauble River in Mason County, Michigan. It was built in 1966, so it is 59 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. Its operating status is: posted for load restriction.

It carries about 2,000 vehicles a day, roughly 10% of them trucks, projected to reach 2,500 by 2017. The structure is 64 ft (19.5 m) long and 30 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesQuarterline Road
CrossesBig Sauble River
Location1.6 MI N of Town Line RD
RouteCounty Highway 5333
CountyMason County
StateMichigan
Coordinates44.1029, -86.3304
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for load 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating42.5 US tons
Inventory rating29.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadHS 20 + Mod
Structure length64 ft (19.5 m)
Longest span32 ft (9.7 m)
Deck width30 ft (9.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,000 (1997)
Projected traffic2,500 by 2017
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Quarterline Road over Big Sauble River built?

It was built in 1966, making it 59 years old in 2025.

What condition is Quarterline Road over Big Sauble 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 August 2024.

How much traffic does Quarterline Road over Big Sauble River carry?

About 2,000 vehicles per day (1997 count), of which roughly 10% are trucks.

How long is Quarterline Road over Big Sauble River?

The structure is 64 ft (19.5 m) long with a longest span of 32 ft (9.7 m) and a deck 30 ft wide.

Who owns Quarterline Road over Big Sauble River?

It is owned by the County Highway Agency.