US Bridges

County Road 321 over Huerfano River

Fair

Pueblo County, Colorado · 12.8 MI Ssw of Avondale · Structure no. PUCO 12.34-302B

Built
1985
40 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
306 ft
3 main spans
Daily traffic
38
2022 count
Owner
County
County Highway Agency

About this bridge

County Road 321 over Huerfano River is a prestressed concrete continuous stringer/multi-beam or girder carrying County Road 321 over Huerfano River in Pueblo County, Colorado. It was built in 1985, so it is 40 years old, younger 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 38 vehicles a day, projected to reach 44 by 2042. The structure is 306 ft (93.4 m) long and 29 ft wide. If it were closed, the detour would be 37.9 mi (61 km).

Location

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CarriesCounty Road 321
CrossesHuerfano River
Location12.8 MI Ssw of Avondale
RouteCounty Highway 0
CountyPueblo County
StateColorado
Coordinates38.05729, -104.41239
Functional classRural Minor 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating74.1 US tons
Inventory rating44.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length306 ft (93.4 m)
Longest span98 ft (29.9 m)
Deck width29 ft (8.7 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic38 (2022)
Projected traffic44 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed37.9 mi (61 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 321 over Huerfano River built?

It was built in 1985, making it 40 years old in 2025.

What condition is County Road 321 over Huerfano 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 December 2024.

How much traffic does County Road 321 over Huerfano River carry?

About 38 vehicles per day (2022 count).

How long is County Road 321 over Huerfano River?

The structure is 306 ft (93.4 m) long with a longest span of 98 ft (29.9 m) and a deck 29 ft wide.

Who owns County Road 321 over Huerfano River?

It is owned by the County Highway Agency.