US Bridges

Irr# CO RD 500 over Sandoval Canyon

Fair

Archuleta County, Colorado · 4.6 MI E of Arboles · Structure no. AR500-6.5-S151

Built
1970
55 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
59 ft
1 main span
Daily traffic
182
2022 count
Owner
County
County Highway Agency

About this bridge

Irr# CO RD 500 over Sandoval Canyon is a steel stringer/multi-beam or girder carrying Irr# CO RD 500 over Sandoval Canyon in Archuleta County, Colorado. It was built in 1970, so it is 55 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 182 vehicles a day, roughly 2% of them trucks, projected to reach 214 by 2042. The structure is 59 ft (18 m) long and 24 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesIrr# CO RD 500
CrossesSandoval Canyon
Location4.6 MI E of Arboles
RouteCounty Highway 0
Coordinates37.02378, -107.33644
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating21.5 US tons

Structure

MaterialSteel
DeckWood or timber
Main spans1
Design loadHS 20
Structure length59 ft (18 m)
Longest span53 ft (16.1 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic182 (2022)
Projected traffic214 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Irr# CO RD 500 over Sandoval Canyon built?

It was built in 1970, making it 55 years old in 2025.

What condition is Irr# CO RD 500 over Sandoval Canyon 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 Irr# CO RD 500 over Sandoval Canyon carry?

About 182 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is Irr# CO RD 500 over Sandoval Canyon?

The structure is 59 ft (18 m) long with a longest span of 53 ft (16.1 m) and a deck 24 ft wide.

Who owns Irr# CO RD 500 over Sandoval Canyon?

It is owned by the County Highway Agency.