US Bridges

Fdr 660 over Rio Blanco

Poor

Archuleta County, Colorado · 12.2 MI Ese of Pagosa Spg · Structure no. 021306000001020

Built
1960
65 years old, rebuilt 2000
Condition
Poor
inspected August 2024
Type
Tee Beam
Prestressed Concrete
Length
67 ft
2 main spans
Daily traffic
73
2002 count
Owner
Federal
U.S. Forest Service

About this bridge

Fdr 660 over Rio Blanco is a prestressed concrete tee beam carrying Fdr 660 over Rio Blanco in Archuleta County, Colorado. It was built in 1960 and reconstructed in 2000, so it is 65 years old, older than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 73 vehicles a day, projected to reach 60 by 2012. The structure is 67 ft (20.4 m) long and 15 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

CarriesFdr 660
CrossesRio Blanco
Location12.2 MI Ese of Pagosa Spg
RouteFederal Lands Road 660
Coordinates37.21295, -106.79409
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36 US tons
Inventory rating22 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length67 ft (20.4 m)
Longest span31 ft (9.6 m)
Deck width15 ft (4.7 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic73 (2002)
Projected traffic60 by 2012
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$225,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Fdr 660 over Rio Blanco built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 2000.

What condition is Fdr 660 over Rio Blanco in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.

How much traffic does Fdr 660 over Rio Blanco carry?

About 73 vehicles per day (2002 count).

How long is Fdr 660 over Rio Blanco?

The structure is 67 ft (20.4 m) long with a longest span of 31 ft (9.6 m) and a deck 15 ft wide.

Who owns Fdr 660 over Rio Blanco?

It is owned by the U.S. Forest Service.