US Bridges

Flatiron Parkwy over Dry Creek

Fair

Boulder County, Colorado · 0.1 MI E of N 55th Street · Structure no. BOLD-05-0.10-01

Built
1985
40 years old
Condition
Fair
inspected February 2025
Type
Tee Beam
Prestressed Concrete
Length
68 ft
1 main span
Daily traffic
2,240
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Flatiron Parkwy over Dry Creek is a prestressed concrete tee beam carrying Flatiron Parkwy over Dry Creek in Boulder County, Colorado. It was built in 1985, so it is 40 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 2,240 vehicles a day, roughly 12% of them trucks, projected to reach 2,688 by 2043. The structure is 68 ft (20.7 m) long and 74 ft wide.

CarriesFlatiron Parkwy
CrossesDry Creek
Location0.1 MI E of N 55th Street
RouteCity Street 0
Coordinates40.02362, -105.22294
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.6 US tons
Inventory rating22 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length68 ft (20.7 m)
Longest span58 ft (17.6 m)
Deck width74 ft (22.6 m)
Roadway width58 ft (17.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,240 (2023)
Projected traffic2,688 by 2043
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed—
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 Flatiron Parkwy over Dry Creek built?

It was built in 1985, making it 40 years old in 2025.

What condition is Flatiron Parkwy 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 February 2025.

How much traffic does Flatiron Parkwy over Dry Creek carry?

About 2,240 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is Flatiron Parkwy over Dry Creek?

The structure is 68 ft (20.7 m) long with a longest span of 58 ft (17.6 m) and a deck 74 ft wide.

Who owns Flatiron Parkwy over Dry Creek?

It is owned by the City or Municipal Highway Agency.