US Bridges

Laingsburg RD over Lookingglass River

FairPosted for load

Shiawassee County, Michigan · 0.75 MI S of Laingsburg · Structure no. 000000000009861

Built
1961
64 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
90 ft
2 main spans
Daily traffic
357
2005 count
Owner
County
County Highway Agency

About this bridge

Laingsburg RD over Lookingglass River is a steel stringer/multi-beam or girder carrying Laingsburg RD over Lookingglass River in Shiawassee County, Michigan. It was built in 1961, so it is 64 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 6 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 357 vehicles a day, roughly 5% of them trucks, projected to reach 530 by 2025. The structure is 90 ft (27.4 m) long and 29 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesLaingsburg RD
CrossesLookingglass River
Location0.75 MI S of Laingsburg
RouteCounty Highway 0
CountyShiawassee County
StateMichigan
Coordinates42.87873, -84.35523
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.8 US tons
Inventory rating25 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length90 ft (27.4 m)
Longest span42 ft (12.8 m)
Deck width29 ft (8.8 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic357 (2005)
Projected traffic530 by 2025
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$304,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Laingsburg RD over Lookingglass River built?

It was built in 1961, making it 64 years old in 2025.

What condition is Laingsburg RD over Lookingglass 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 March 2024.

How much traffic does Laingsburg RD over Lookingglass River carry?

About 357 vehicles per day (2005 count), of which roughly 5% are trucks.

How long is Laingsburg RD over Lookingglass River?

The structure is 90 ft (27.4 m) long with a longest span of 42 ft (12.8 m) and a deck 29 ft wide.

Who owns Laingsburg RD over Lookingglass River?

It is owned by the County Highway Agency.