US Bridges

Access Road over Big Thompson River

Good

Larimer County, Colorado · 25 Ft S on US 34 · Structure no. LRB10-1658BTC-A

Built
2018
7 years old
Condition
Good
inspected April 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
64 ft
1 main span
Daily traffic
16
2023 count
Owner
County
County Highway Agency

About this bridge

Access Road over Big Thompson River is a prestressed concrete box beam or girders - multiple carrying Access 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 16 vehicles a day, projected to reach 20 by 2042. The structure is 64 ft (19.4 m) long and 18 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesAccess Road
CrossesBig Thompson River
Location25 Ft S on US 34
RouteCounty Highway 0
CountyLarimer County
StateColorado
Coordinates40.4276, -105.34448
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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating46.7 US tons
Inventory rating36 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length64 ft (19.4 m)
Longest span56 ft (17.2 m)
Deck width18 ft (5.6 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16 (2023)
Projected traffic20 by 2042
Trucks0%
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 byCounty Highway 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 Access Road over Big Thompson River built?

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

What condition is Access 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 Access Road over Big Thompson River carry?

About 16 vehicles per day (2023 count).

How long is Access Road over Big Thompson River?

The structure is 64 ft (19.4 m) long with a longest span of 56 ft (17.2 m) and a deck 18 ft wide.

Who owns Access Road over Big Thompson River?

It is owned by the County Highway Agency.