US Bridges

Nwp Ramp over EB Dillon Road

Fair

Boulder County, Colorado · 6.29 MI from I-25 · Structure no. NWP-06.29

Built
2002
23 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
292 ft
3 main spans
Daily traffic
1,100
2018 count
Owner
Toll Authority
Local Toll Authority

About this bridge

Nwp Ramp over EB Dillon Road is a prestressed concrete continuous stringer/multi-beam or girder carrying Nwp Ramp over EB Dillon Road in Boulder County, Colorado. It was built in 2002, so it is 23 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 1,100 vehicles a day, roughly 5% of them trucks, projected to reach 10,000 by 2038. The structure is 292 ft (89 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesNwp Ramp
CrossesEB Dillon Road
Location6.29 MI from I-25
Coordinates39.95877, -105.09654
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.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.3 US tons
Inventory rating41.3 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length292 ft (89 m)
Longest span133 ft (40.4 m)
Deck width42 ft (12.8 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,100 (2018)
Projected traffic10,000 by 2038
Trucks5%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a toll road
National Highway SystemYes

Ownership and planned work

OwnerLocal Toll Authority
Maintained byLocal Toll Authority
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 Nwp Ramp over EB Dillon Road built?

It was built in 2002, making it 23 years old in 2025.

What condition is Nwp Ramp over EB Dillon Road 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 June 2023.

How much traffic does Nwp Ramp over EB Dillon Road carry?

About 1,100 vehicles per day (2018 count), of which roughly 5% are trucks.

How long is Nwp Ramp over EB Dillon Road?

The structure is 292 ft (89 m) long with a longest span of 133 ft (40.4 m) and a deck 42 ft wide.

Who owns Nwp Ramp over EB Dillon Road?

It is owned by the Local Toll Authority.