US Bridges

NB 225 Ramp over I25 Ml

Fair

Denver County, Colorado · I25 to I225 Ramp · Structure no. F-17-OD

Built
2005
20 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,438 ft
10 main spans
Daily traffic
69,000
2020 count
Owner
State
State Highway Agency

About this bridge

NB 225 Ramp over I25 Ml is a steel continuous stringer/multi-beam or girder carrying NB 225 Ramp over I25 Ml in Denver County, Colorado. It was built in 2005, so it is 20 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 69,000 vehicles a day, roughly 6% of them trucks, projected to reach 86,250 by 2040. The structure is 1,438 ft (438.2 m) long and 41 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesNB 225 Ramp
CrossesI25 Ml
LocationI25 to I225 Ramp
RouteInterstate 225A
Coordinates39.63399, -104.90518
Functional classUrban Principal Arterial - Interstate

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
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 rating43.1 US tons
Inventory rating43 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans10
Design loadHS 25 or greater
Structure length1,438 ft (438.2 m)
Longest span200 ft (61 m)
Deck width41 ft (12.6 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic69,000 (2020)
Projected traffic86,250 by 2040
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway and railroad
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 NB 225 Ramp over I25 Ml built?

It was built in 2005, making it 20 years old in 2025.

What condition is NB 225 Ramp over I25 Ml 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 2024.

How much traffic does NB 225 Ramp over I25 Ml carry?

About 69,000 vehicles per day (2020 count), of which roughly 6% are trucks.

How long is NB 225 Ramp over I25 Ml?

The structure is 1,438 ft (438.2 m) long with a longest span of 200 ft (61 m) and a deck 41 ft wide.

Who owns NB 225 Ramp over I25 Ml?

It is owned by the State Highway Agency.