US Bridges

County RD 43 over N. Fork Big Thompson

Good

Larimer County, Colorado · 1.0 MI E of Horseshoe RD · Structure no. LR43-4.4-61

Built
2016
9 years old
Condition
Good
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
58 ft
1 main span
Daily traffic
415
2023 count
Owner
County
County Highway Agency

About this bridge

County RD 43 over N. Fork Big Thompson is a prestressed concrete box beam or girders - multiple carrying County RD 43 over N. Fork Big Thompson in Larimer County, Colorado. It was built in 2016, so it is 9 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 415 vehicles a day, roughly 17% of them trucks, projected to reach 519 by 2042. The structure is 58 ft (17.6 m) long and 28 ft wide. If it were closed, the detour would be 24.9 mi (40 km).

Location

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CarriesCounty RD 43
CrossesN. Fork Big Thompson
Location1.0 MI E of Horseshoe RD
RouteCounty Highway 0
CountyLarimer County
StateColorado
Coordinates40.45531, -105.43425
Functional classRural Major Collector

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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating63.6 US tons
Inventory rating48.9 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length58 ft (17.6 m)
Longest span51 ft (15.5 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic415 (2023)
Projected traffic519 by 2042
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 43 over N. Fork Big Thompson built?

It was built in 2016, making it 9 years old in 2025.

What condition is County RD 43 over N. Fork Big Thompson 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 May 2023.

How much traffic does County RD 43 over N. Fork Big Thompson carry?

About 415 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is County RD 43 over N. Fork Big Thompson?

The structure is 58 ft (17.6 m) long with a longest span of 51 ft (15.5 m) and a deck 28 ft wide.

Who owns County RD 43 over N. Fork Big Thompson?

It is owned by the County Highway Agency.