US Bridges

Airport Road over Looking Glass River

Fair

Clinton County, Michigan · Between Herbison Rds · Structure no. 000000000001928

Built
1993
32 years old
Condition
Fair
inspected October 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
112 ft
1 main span
Daily traffic
4,115
2011 count
Owner
County
County Highway Agency

About this bridge

Airport Road over Looking Glass River is a prestressed concrete box beam or girders - multiple carrying Airport Road over Looking Glass River in Clinton County, Michigan. It was built in 1993, so it is 32 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 4,115 vehicles a day, roughly 2% of them trucks, projected to reach 7,432 by 2031. The structure is 112 ft (34.1 m) long and 50 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesAirport Road
CrossesLooking Glass River
LocationBetween Herbison Rds
RouteCounty Highway 1949
CountyClinton County
StateMichigan
Coordinates42.82474, -84.60268
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating102.8 US tons
Inventory rating62.5 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length112 ft (34.1 m)
Longest span105 ft (32 m)
Deck width50 ft (15.1 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,115 (2011)
Projected traffic7,432 by 2031
Trucks2%
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 Airport Road over Looking Glass River built?

It was built in 1993, making it 32 years old in 2025.

What condition is Airport Road 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 October 2024.

How much traffic does Airport Road over Looking Glass River carry?

About 4,115 vehicles per day (2011 count), of which roughly 2% are trucks.

How long is Airport Road over Looking Glass River?

The structure is 112 ft (34.1 m) long with a longest span of 105 ft (32 m) and a deck 50 ft wide.

Who owns Airport Road over Looking Glass River?

It is owned by the County Highway Agency.