US Bridges

Ramp B over I-25 and Nwp

Good

Broomfield County, Colorado · I25 NB Ramp to Nwp WB · Structure no. 46.28

Built
2003
22 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
806 ft
4 main spans
Daily traffic
820
2018 count
Owner
Toll Authority
Local Toll Authority

About this bridge

Ramp B over I-25 and Nwp is a steel continuous stringer/multi-beam or girder carrying Ramp B over I-25 and Nwp in Broomfield County, Colorado. It was built in 2003, so it is 22 years old, younger than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 820 vehicles a day, roughly 10% of them trucks, projected to reach 10,000 by 2038. The structure is 806 ft (245.6 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesRamp B
CrossesI-25 and Nwp
LocationI25 NB Ramp to Nwp WB
CountyBroomfield County
StateColorado
Coordinates39.98222, -104.98944
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating66.5 US tons
Inventory rating39.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 25 or greater
Structure length806 ft (245.6 m)
Longest span221 ft (67.3 m)
Deck width30 ft (9.1 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deck17 ft (5.2 m)

Traffic and service

Average daily traffic820 (2018)
Projected traffic10,000 by 2038
Trucks10%
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 Ramp B over I-25 and Nwp built?

It was built in 2003, making it 22 years old in 2025.

What condition is Ramp B over I-25 and Nwp in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.

How much traffic does Ramp B over I-25 and Nwp carry?

About 820 vehicles per day (2018 count), of which roughly 10% are trucks.

How long is Ramp B over I-25 and Nwp?

The structure is 806 ft (245.6 m) long with a longest span of 221 ft (67.3 m) and a deck 30 ft wide.

Who owns Ramp B over I-25 and Nwp?

It is owned by the Local Toll Authority.