US Bridges

County Road 339 over Rio Blanco River

Fair

Archuleta County, Colorado · 9.1 MI SE of Pagosa Spgs · Structure no. AR339-SO.3-S84A

Built
1988
37 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
57 ft
1 main span
Daily traffic
128
2022 count
Owner
County
County Highway Agency

About this bridge

County Road 339 over Rio Blanco River is a steel stringer/multi-beam or girder carrying County Road 339 over Rio Blanco River in Archuleta County, Colorado. It was built in 1988, so it is 37 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 128 vehicles a day, projected to reach 151 by 2042. The structure is 57 ft (17.4 m) long and 16 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesCounty Road 339
CrossesRio Blanco River
Location9.1 MI SE of Pagosa Spgs
RouteCounty Highway 0
CountyArchuleta County
StateColorado
Coordinates37.1482, -106.93866
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating29.9 US tons
Inventory rating17.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length57 ft (17.4 m)
Longest span56 ft (17 m)
Deck width16 ft (4.9 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic128 (2022)
Projected traffic151 by 2042
Trucks0%
Lanes on structure2
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 339 over Rio Blanco River built?

It was built in 1988, making it 37 years old in 2025.

What condition is County Road 339 over Rio Blanco 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 October 2024.

How much traffic does County Road 339 over Rio Blanco River carry?

About 128 vehicles per day (2022 count).

How long is County Road 339 over Rio Blanco River?

The structure is 57 ft (17.4 m) long with a longest span of 56 ft (17 m) and a deck 16 ft wide.

Who owns County Road 339 over Rio Blanco River?

It is owned by the County Highway Agency.