US Bridges

S Airport Road over Boardman River

Fair

Grand Traverse County, Michigan · 0.8 MI S of Traverse City · Structure no. 000000000003066

Built
1961
64 years old
Condition
Fair
inspected September 2024
Type
Culvert
Steel
Length
39 ft
2 main spans
Daily traffic
18,938
2019 count
Owner
County
County Highway Agency

About this bridge

S Airport Road over Boardman River is a steel culvert carrying S Airport Road over Boardman River in Grand Traverse 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.

It carries about 18,938 vehicles a day, roughly 3% of them trucks, projected to reach 25,000 by 2030. The structure is 39 ft (11.8 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesS Airport Road
CrossesBoardman River
Location0.8 MI S of Traverse City
RouteCounty Highway 2020
CountyGrand Traverse County
StateMichigan
Coordinates44.73323, -85.61638
Functional classUrban Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating41.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length39 ft (11.8 m)
Longest span15 ft (4.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,938 (2019)
Projected traffic25,000 by 2030
Trucks3%
Lanes on structure2
Traffic directionOne-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 S Airport Road over Boardman River built?

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

What condition is S Airport Road over Boardman 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 September 2024.

How much traffic does S Airport Road over Boardman River carry?

About 18,938 vehicles per day (2019 count), of which roughly 3% are trucks.

How long is S Airport Road over Boardman River?

The structure is 39 ft (11.8 m) long with a longest span of 15 ft (4.7 m).

Who owns S Airport Road over Boardman River?

It is owned by the County Highway Agency.