US Bridges

Airport Road (CR25 over Left Hand Creek

Fair

Boulder County, Colorado · 50 Ft N of ST HWY 119 · Structure no. BC-25-4.7-LT1

Built
2003
22 years old
Condition
Fair
inspected February 2025
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
69 ft
1 main span
Daily traffic
10,085
2023 count
Owner
County
County Highway Agency

About this bridge

Airport Road (CR25 over Left Hand Creek is a prestressed concrete box beam or girders - multiple carrying Airport Road (CR25 over Left Hand Creek in Boulder County, Colorado. It was built in 2003, so it is 22 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 10,085 vehicles a day, roughly 9% of them trucks, projected to reach 12,102 by 2042. The structure is 69 ft (20.9 m) long and 73 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesAirport Road (CR25
CrossesLeft Hand Creek
Location50 Ft N of ST HWY 119
RouteCounty Highway 0
CountyBoulder County
StateColorado
Coordinates40.12369, -105.14984
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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating59.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length69 ft (20.9 m)
Longest span65 ft (19.8 m)
Deck width73 ft (22.1 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,085 (2023)
Projected traffic12,102 by 2042
Trucks9%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Airport Road (CR25 over Left Hand Creek built?

It was built in 2003, making it 22 years old in 2025.

What condition is Airport Road (CR25 over Left Hand 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 February 2025.

How much traffic does Airport Road (CR25 over Left Hand Creek carry?

About 10,085 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is Airport Road (CR25 over Left Hand Creek?

The structure is 69 ft (20.9 m) long with a longest span of 65 ft (19.8 m) and a deck 73 ft wide.

Who owns Airport Road (CR25 over Left Hand Creek?

It is owned by the County Highway Agency.