US Bridges

Ainger Road over I-69

Fair

Eaton County, Michigan · 1.0 MI N of Olivet · Structure no. 000000000002254

Built
1972
53 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
364 ft
6 main spans
Daily traffic
850
1988 count
Owner
State
State Highway Agency

About this bridge

Ainger Road over I-69 is a steel stringer/multi-beam or girder carrying Ainger Road over I-69 in Eaton County, Michigan. It was built in 1972, so it is 53 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 850 vehicles a day, roughly 3% of them trucks, projected to reach 600 by 2007. The structure is 364 ft (111 m) long and 44 ft wide.

CarriesAinger Road
CrossesI-69
Location1.0 MI N of Olivet
RouteCounty Highway 0
Coordinates42.45861, -84.92743
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.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.4 US tons
Inventory rating42.9 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans6
Design loadH 20
Structure length364 ft (111 m)
Longest span91 ft (27.6 m)
Deck width44 ft (13.5 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic850 (1988)
Projected traffic600 by 2007
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Ainger Road over I-69 built?

It was built in 1972, making it 53 years old in 2025.

What condition is Ainger Road over I-69 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 May 2023.

How much traffic does Ainger Road over I-69 carry?

About 850 vehicles per day (1988 count), of which roughly 3% are trucks.

How long is Ainger Road over I-69?

The structure is 364 ft (111 m) long with a longest span of 91 ft (27.6 m) and a deck 44 ft wide.

Who owns Ainger Road over I-69?

It is owned by the State Highway Agency.