US Bridges

County Road 25 over Big Thompson River

Fair

Weld County, Colorado · 0.3 MI N of ST HWY 60 · Structure no. MIL025.0-048.0A

Built
1984
41 years old, rebuilt 1995
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
80 ft
2 main spans
Daily traffic
1,840
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

County Road 25 over Big Thompson River is a steel stringer/multi-beam or girder carrying County Road 25 over Big Thompson River in Weld County, Colorado. It was built in 1984 and reconstructed in 1995, so it is 41 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 5 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 1,840 vehicles a day, roughly 60% of them trucks, projected to reach 2,612 by 2042. The structure is 80 ft (24.4 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCounty Road 25
CrossesBig Thompson River
Location0.3 MI N of ST HWY 60
RouteCity Street 0
CountyWeld County
StateColorado
Coordinates40.33672, -104.82989
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.1 US tons
Inventory rating33.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans2
Design loadHS 20
Structure length80 ft (24.4 m)
Longest span38 ft (11.5 m)
Deck width31 ft (9.6 m)
Roadway width31 ft (9.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,840 (2023)
Projected traffic2,612 by 2042
Trucks60%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 County Road 25 over Big Thompson River built?

It was built in 1984, making it 41 years old in 2025. It was reconstructed in 1995.

What condition is County Road 25 over Big Thompson River 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 March 2024.

How much traffic does County Road 25 over Big Thompson River carry?

About 1,840 vehicles per day (2023 count), of which roughly 60% are trucks.

How long is County Road 25 over Big Thompson River?

The structure is 80 ft (24.4 m) long with a longest span of 38 ft (11.5 m) and a deck 31 ft wide.

Who owns County Road 25 over Big Thompson River?

It is owned by the Town or Township Highway Agency.