US Bridges

Waltonia Road over Big Thompson River

Good

Larimer County, Colorado · 20 Ft S of US 34 · Structure no. LRB13-1810BTC-A

Built
2018
7 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
96 ft
1 main span
Daily traffic
107
2023 count
Owner
County
County Highway Agency

About this bridge

Waltonia Road over Big Thompson River is a prestressed concrete stringer/multi-beam or girder carrying Waltonia Road over Big Thompson River in Larimer County, Colorado. It was built in 2018, so it is 7 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 107 vehicles a day, roughly 20% of them trucks, projected to reach 134 by 2042. The structure is 96 ft (29.3 m) long and 23 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesWaltonia Road
CrossesBig Thompson River
Location20 Ft S of US 34
RouteCounty Highway 0
Coordinates40.41506, -105.36323
Functional classRural Local

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating57.1 US tons
Inventory rating42.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length96 ft (29.3 m)
Longest span89 ft (27.1 m)
Deck width23 ft (6.9 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic107 (2023)
Projected traffic134 by 2042
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byOther Local Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Waltonia Road over Big Thompson River built?

It was built in 2018, making it 7 years old in 2025.

What condition is Waltonia Road 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 April 2023.

How much traffic does Waltonia Road over Big Thompson River carry?

About 107 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is Waltonia Road over Big Thompson River?

The structure is 96 ft (29.3 m) long with a longest span of 89 ft (27.1 m) and a deck 23 ft wide.

Who owns Waltonia Road over Big Thompson River?

It is owned by the County Highway Agency and maintained by the Other Local Agency.