US Bridges

County Road 20 over Dry Creek

Fair

Larimer County, Colorado · 0.3 MI E of CO RD 29 · Structure no. LR20-0.3-29

Built
1982
43 years old
Condition
Fair
inspected May 2023
Type
Arch - Deck
Steel
Length
34 ft
1 main span
Daily traffic
2,122
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 20 over Dry Creek is a steel arch - deck carrying County Road 20 over Dry Creek in Larimer County, Colorado. It was built in 1982, so it is 43 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 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 2,122 vehicles a day, roughly 23% of them trucks, projected to reach 2,653 by 2042. The structure is 34 ft (10.4 m) long and 86 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCounty Road 20
CrossesDry Creek
Location0.3 MI E of CO RD 29
RouteCounty Highway 0
CountyLarimer County
StateColorado
Coordinates40.38828, -105.18761
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
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 protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating106.8 US tons
Inventory rating106.8 US tons

Structure

Structure typeArch - Deck
MaterialSteel
DeckNot applicable
Main spans1
Design loadHS 20
Structure length34 ft (10.4 m)
Longest span34 ft (10.4 m)
Deck width86 ft (26.3 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,122 (2023)
Projected traffic2,653 by 2042
Trucks23%
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

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 Road 20 over Dry Creek built?

It was built in 1982, making it 43 years old in 2025.

What condition is County Road 20 over Dry Creek 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 20 over Dry Creek carry?

About 2,122 vehicles per day (2023 count), of which roughly 23% are trucks.

How long is County Road 20 over Dry Creek?

The structure is 34 ft (10.4 m) long with a longest span of 34 ft (10.4 m) and a deck 86 ft wide.

Who owns County Road 20 over Dry Creek?

It is owned by the County Highway Agency.