US Bridges

Iris AVENUE/34 ST over Wonderland Creek

Fair

Boulder County, Colorado · Iris Ave and 34th St. · Structure no. BOLD-41-IRISAVE

Built
2017
8 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete
Length
50 ft
2 main spans
Daily traffic
1,937
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Iris AVENUE/34 ST over Wonderland Creek is a concrete culvert carrying Iris AVENUE/34 ST over Wonderland Creek in Boulder County, Colorado. It was built in 2017, so it is 8 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 1,937 vehicles a day, roughly 4% of them trucks, projected to reach 2,325 by 2042. The structure is 50 ft (15.2 m) long and 53 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesIris AVENUE/34 ST
CrossesWonderland Creek
LocationIris Ave and 34th St.
RouteCity Street 0
CountyBoulder County
StateColorado
Coordinates40.03648, -105.24894
Functional classUrban Local

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 protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.8 US tons
Inventory rating40 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHL 93
Structure length50 ft (15.2 m)
Longest span23 ft (7.1 m)
Deck width53 ft (16.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,937 (2023)
Projected traffic2,325 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Iris AVENUE/34 ST over Wonderland Creek built?

It was built in 2017, making it 8 years old in 2025.

What condition is Iris AVENUE/34 ST over Wonderland 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 Iris AVENUE/34 ST over Wonderland Creek carry?

About 1,937 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Iris AVENUE/34 ST over Wonderland Creek?

The structure is 50 ft (15.2 m) long with a longest span of 23 ft (7.1 m) and a deck 53 ft wide.

Who owns Iris AVENUE/34 ST over Wonderland Creek?

It is owned by the City or Municipal Highway Agency.