US Bridges

I 25 Ml Sbnd over Big Thompson River

Good

Larimer County, Colorado · 0.7 MI So of JCT US 34 · Structure no. C-17-BLA

Built
2022
3 years old
Condition
Good
inspected June 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
283 ft
3 main spans
Daily traffic
34,000
2011 count
Owner
State
State Highway Agency

About this bridge

I 25 Ml Sbnd over Big Thompson River is a prestressed concrete continuous box beam or girders - single or spread carrying I 25 Ml Sbnd over Big Thompson River in Larimer County, Colorado. It was built in 2022, so it is 3 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 34,000 vehicles a day, roughly 11% of them trucks, projected to reach 51,000 by 2031. The structure is 283 ft (86.3 m) long and 79 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesI 25 Ml Sbnd
CrossesBig Thompson River
Location0.7 MI So of JCT US 34
RouteInterstate 25A
Coordinates40.39684, -104.99336
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.1 US tons
Inventory rating42.9 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, precast panels
Main spans3
Design loadHL 93
Structure length283 ft (86.3 m)
Longest span91 ft (27.7 m)
Deck width79 ft (24.1 m)
Roadway width76 ft (23.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34,000 (2011)
Projected traffic51,000 by 2031
Trucks11%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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 I 25 Ml Sbnd over Big Thompson River built?

It was built in 2022, making it 3 years old in 2025.

What condition is I 25 Ml Sbnd over Big Thompson River 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 I 25 Ml Sbnd over Big Thompson River carry?

About 34,000 vehicles per day (2011 count), of which roughly 11% are trucks.

How long is I 25 Ml Sbnd over Big Thompson River?

The structure is 283 ft (86.3 m) long with a longest span of 91 ft (27.7 m) and a deck 79 ft wide.

Who owns I 25 Ml Sbnd over Big Thompson River?

It is owned by the State Highway Agency.