US Bridges

County Road AA.5 over Lone Rock Draw

Fair

Baca County, Colorado · W of CR 24.3 · Structure no. BAAA-24-23.5-75

Built
1960
65 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
84 ft
2 main spans
Daily traffic
37
2022 count
Owner
County
County Highway Agency

About this bridge

County Road AA.5 over Lone Rock Draw is a steel stringer/multi-beam or girder carrying County Road AA.5 over Lone Rock Draw in Baca County, Colorado. It was built in 1960, 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 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: open, posting recommended but not legally implemented.

It carries about 37 vehicles a day, projected to reach 47 by 2042. The structure is 84 ft (25.7 m) long and 24 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesCounty Road AA.5
CrossesLone Rock Draw
LocationW of CR 24.3
RouteCounty Highway 0
CountyBaca County
StateColorado
Coordinates37.34648, -102.64816
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, posting recommended but not legally implemented
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating28.8 US tons
Inventory rating17.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length84 ft (25.7 m)
Longest span37 ft (11.4 m)
Deck width24 ft (7.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic37 (2022)
Projected traffic47 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 AA.5 over Lone Rock Draw built?

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

What condition is County Road AA.5 over Lone Rock Draw 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 April 2024.

How much traffic does County Road AA.5 over Lone Rock Draw carry?

About 37 vehicles per day (2022 count).

How long is County Road AA.5 over Lone Rock Draw?

The structure is 84 ft (25.7 m) long with a longest span of 37 ft (11.4 m) and a deck 24 ft wide.

Who owns County Road AA.5 over Lone Rock Draw?

It is owned by the County Highway Agency.