US Bridges

Dillon Road over Coal Creek & Ped Tra

Fair

Boulder County, Colorado · 0.5 MI E of Mccaslin Blvd · Structure no. LOUIS-DILLRD

Built
1993
32 years old
Condition
Fair
inspected February 2025
Type
Frame
Concrete
Length
43 ft
2 main spans
Daily traffic
15,732
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Dillon Road over Coal Creek & Ped Tra is a concrete frame carrying Dillon Road over Coal Creek & Ped Tra in Boulder County, Colorado. It was built in 1993, so it is 32 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 15,732 vehicles a day, roughly 9% of them trucks, projected to reach 18,878 by 2042. The structure is 43 ft (13.1 m) long and 87 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesDillon Road
CrossesCoal Creek & Ped Tra
Location0.5 MI E of Mccaslin Blvd
RouteCity Street 0
CountyBoulder County
StateColorado
Coordinates39.95775, -105.15269
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.5 US tons
Inventory rating32.1 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length43 ft (13.1 m)
Longest span21 ft (6.4 m)
Deck width87 ft (26.4 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,732 (2023)
Projected traffic18,878 by 2042
Trucks9%
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Dillon Road over Coal Creek & Ped Tra built?

It was built in 1993, making it 32 years old in 2025.

What condition is Dillon Road over Coal Creek & Ped Tra 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 Dillon Road over Coal Creek & Ped Tra carry?

About 15,732 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is Dillon Road over Coal Creek & Ped Tra?

The structure is 43 ft (13.1 m) long with a longest span of 21 ft (6.4 m) and a deck 87 ft wide.

Who owns Dillon Road over Coal Creek & Ped Tra?

It is owned by the City or Municipal Highway Agency.