US Bridges

Airport Road over Dry Creek

Fair

Boulder County, Colorado · 0.1 MI N of Buckthorn Dr. · Structure no. LONG-AIRPT-BUCK

Built
1994
31 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete
Length
52 ft
4 main spans
Daily traffic
11,244
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Airport Road over Dry Creek is a concrete culvert carrying Airport Road over Dry Creek in Boulder County, Colorado. It was built in 1994, so it is 31 years old, younger than the Colorado average of 42.2 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 11,244 vehicles a day, roughly 8% of them trucks, projected to reach 13,493 by 2043. The structure is 52 ft (16 m) long and 86 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesAirport Road
CrossesDry Creek
Location0.1 MI N of Buckthorn Dr.
RouteCity Street 0
CountyBoulder County
StateColorado
Coordinates40.14789, -105.15283
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 inspectionJanuary 2025
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 geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85.6 US tons
Inventory rating51.4 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadHS 20
Structure length52 ft (16 m)
Longest span12 ft (3.7 m)
Deck width86 ft (26.2 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,244 (2023)
Projected traffic13,493 by 2043
Trucks8%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Dry Creek built?

It was built in 1994, making it 31 years old in 2025.

What condition is Airport Road over Dry Creek 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 January 2025.

How much traffic does Airport Road over Dry Creek carry?

About 11,244 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is Airport Road over Dry Creek?

The structure is 52 ft (16 m) long with a longest span of 12 ft (3.7 m) and a deck 86 ft wide.

Who owns Airport Road over Dry Creek?

It is owned by the City or Municipal Highway Agency.