US Bridges

NB Airport Blvd over Sand Creek

Fair

Adams County, Colorado · 0.5 MI North of Colfax · Structure no. AUR03.9-L.01

Built
1991
34 years old
Condition
Fair
inspected October 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
204 ft
2 main spans
Daily traffic
16,295
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

NB Airport Blvd over Sand Creek is a prestressed concrete continuous box beam or girders - multiple carrying NB Airport Blvd over Sand Creek in Adams County, Colorado. It was built in 1991, so it is 34 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 16,295 vehicles a day, roughly 6% of them trucks, projected to reach 21,184 by 2041. The structure is 204 ft (62.2 m) long and 58 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesNB Airport Blvd
CrossesSand Creek
Location0.5 MI North of Colfax
RouteCity Street 0
CountyAdams County
StateColorado
Coordinates39.74789, -104.79118
Functional classUrban Other Principal 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.6 US tons
Inventory rating34.9 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length204 ft (62.2 m)
Longest span96 ft (29.4 m)
Deck width58 ft (17.7 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,295 (2021)
Projected traffic21,184 by 2041
Trucks6%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was NB Airport Blvd over Sand Creek built?

It was built in 1991, making it 34 years old in 2025.

What condition is NB Airport Blvd over Sand 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 October 2023.

How much traffic does NB Airport Blvd over Sand Creek carry?

About 16,295 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is NB Airport Blvd over Sand Creek?

The structure is 204 ft (62.2 m) long with a longest span of 96 ft (29.4 m) and a deck 58 ft wide.

Who owns NB Airport Blvd over Sand Creek?

It is owned by the City or Municipal Highway Agency.