US Bridges

I-69 WB over Looking Glass River

Fair

Shiawassee County, Michigan · 5.0 MI NE of M-52 · Structure no. 000000000009733

Built
1961
64 years old, rebuilt 2010
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
40 ft
1 main span
Daily traffic
192,000
2011 count
Owner
State
State Highway Agency

About this bridge

I-69 WB over Looking Glass River is a prestressed concrete stringer/multi-beam or girder carrying I-69 WB over Looking Glass River in Shiawassee County, Michigan. It was built in 1961 and reconstructed in 2010, 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.

It carries about 192,000 vehicles a day, roughly 17% of them trucks, projected to reach 212,000 by 2031. The structure is 40 ft (12.2 m) long and 47 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-69 WB
CrossesLooking Glass River
Location5.0 MI NE of M-52
RouteInterstate 69
Coordinates42.8712, -84.13461
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 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 geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.3 US tons
Inventory rating38.6 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length40 ft (12.2 m)
Longest span36 ft (10.9 m)
Deck width47 ft (14.2 m)
Roadway width44 ft (13.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic192,000 (2011)
Projected traffic212,000 by 2031
Trucks17%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 I-69 WB over Looking Glass River built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 2010.

What condition is I-69 WB over Looking Glass 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 July 2023.

How much traffic does I-69 WB over Looking Glass River carry?

About 192,000 vehicles per day (2011 count), of which roughly 17% are trucks.

How long is I-69 WB over Looking Glass River?

The structure is 40 ft (12.2 m) long with a longest span of 36 ft (10.9 m) and a deck 47 ft wide.

Who owns I-69 WB over Looking Glass River?

It is owned by the State Highway Agency.