US Bridges

County Road AA.5 over Lone Rock Draw

FairPosted for load

Baca County, Colorado · W of CR 24.3 · Structure no. BA53-53-36.3-60

Built
1960
65 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
75 ft
2 main spans
Daily traffic
72
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 5 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 72 vehicles a day, projected to reach 92 by 2042. The structure is 75 ft (22.9 m) long and 24 ft wide. If it were closed, the detour would be 1.9 mi (3 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, -102.64815
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionApril 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating39.1 US tons
Inventory rating23.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length75 ft (22.9 m)
Longest span33 ft (10.2 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic72 (2022)
Projected traffic92 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 72 vehicles per day (2022 count).

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

The structure is 75 ft (22.9 m) long with a longest span of 33 ft (10.2 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.