US Bridges

County RD 6.8 over Unnamed Natural Drainage

FairPosted for load

Las Animas County, Colorado · .3 MI W of CR 121.9 · Structure no. LA6.8-61-4-97

Built
1940
85 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Aluminum, Wrought Iron, or Cast Iron
Length
29 ft
2 main spans
Daily traffic
44
2022 count
Owner
County
County Highway Agency

About this bridge

County RD 6.8 over Unnamed Natural Drainage is a aluminum, wrought iron, or cast iron stringer/multi-beam or girder carrying County RD 6.8 over Unnamed Natural Drainage in Las Animas County, Colorado. It was built in 1940, so it is 85 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. Its operating status is: posted for load restriction.

It carries about 44 vehicles a day, projected to reach 54 by 2042. The structure is 29 ft (8.7 m) long and 30 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

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CarriesCounty RD 6.8
CrossesUnnamed Natural Drainage
Location.3 MI W of CR 121.9
RouteCounty Highway 0
CountyLas Animas County
StateColorado
Coordinates37.04295, -104.04437
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating11.7 US tons
Inventory rating7.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialAluminum, Wrought Iron, or Cast Iron
DeckAluminum
Main spans2
Design loadUnknown
Structure length29 ft (8.7 m)
Longest span11 ft (3.5 m)
Deck width30 ft (9.1 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic44 (2022)
Projected traffic54 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$528,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 6.8 over Unnamed Natural Drainage built?

It was built in 1940, making it 85 years old in 2025.

What condition is County RD 6.8 over Unnamed Natural Drainage 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 June 2023.

How much traffic does County RD 6.8 over Unnamed Natural Drainage carry?

About 44 vehicles per day (2022 count).

How long is County RD 6.8 over Unnamed Natural Drainage?

The structure is 29 ft (8.7 m) long with a longest span of 11 ft (3.5 m) and a deck 30 ft wide.

Who owns County RD 6.8 over Unnamed Natural Drainage?

It is owned by the County Highway Agency.