US Bridges

County Road 103 over Laramie River

Fair

Larimer County, Colorado · 6.0 MI North of ST HWY 14 · Structure no. LR103-6.0-S14

Built
1940
85 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
29 ft
1 main span
Daily traffic
95
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 103 over Laramie River is a wood or timber stringer/multi-beam or girder carrying County Road 103 over Laramie River in Larimer County, Colorado. It was built in 1940, so it is 85 years old, older 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 6 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 95 vehicles a day, roughly 19% of them trucks, projected to reach 119 by 2042. The structure is 29 ft (8.7 m) long and 27 ft wide. If it were closed, the detour would be 31.7 mi (51 km).

Location

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CarriesCounty Road 103
CrossesLaramie River
Location6.0 MI North of ST HWY 14
RouteCounty Highway 0
CountyLarimer County
StateColorado
Coordinates40.66691, -105.85903
Functional classRural Major Collector

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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating31.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length29 ft (8.7 m)
Longest span26 ft (7.8 m)
Deck width27 ft (8.3 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic95 (2023)
Projected traffic119 by 2042
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed31.7 mi (51 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 103 over Laramie River built?

It was built in 1940, making it 85 years old in 2025.

What condition is County Road 103 over Laramie 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 May 2023.

How much traffic does County Road 103 over Laramie River carry?

About 95 vehicles per day (2023 count), of which roughly 19% are trucks.

How long is County Road 103 over Laramie River?

The structure is 29 ft (8.7 m) long with a longest span of 26 ft (7.8 m) and a deck 27 ft wide.

Who owns County Road 103 over Laramie River?

It is owned by the County Highway Agency.