US Bridges

Airport Road over Portage Creek

Good

Delta County, Michigan · Delta CO Airport · Structure no. 000000000013747

Built
2004
21 years old
Condition
Good
inspected July 2023
Type
Culvert
Concrete
Length
29 ft
1 main span
Daily traffic
474
2020 count
Owner
County
County Highway Agency

About this bridge

Airport Road over Portage Creek is a concrete culvert carrying Airport Road over Portage Creek in Delta County, Michigan. It was built in 2004, so it is 21 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 474 vehicles a day, projected to reach 521 by 2041. The structure is 29 ft (8.7 m) long. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesAirport Road
CrossesPortage Creek
LocationDelta CO Airport
RouteCounty Highway 0
CountyDelta County
StateMichigan
Coordinates45.71726, -87.09742
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.7 US tons
Inventory rating36.4 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 25 or greater
Structure length29 ft (8.7 m)
Longest span26 ft (7.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic474 (2020)
Projected traffic521 by 2041
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 Portage Creek built?

It was built in 2004, making it 21 years old in 2025.

What condition is Airport Road over Portage Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2023.

How much traffic does Airport Road over Portage Creek carry?

About 474 vehicles per day (2020 count).

How long is Airport Road over Portage Creek?

The structure is 29 ft (8.7 m) long with a longest span of 26 ft (7.9 m).

Who owns Airport Road over Portage Creek?

It is owned by the County Highway Agency.