US Bridges

County Road 13 over Trib N.Fk Lone Rock Crk

FairPosted for load

Baca County, Colorado · .2 S of CR X · Structure no. BA13-13-19.8-22

Built
1960
65 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
41 ft
1 main span
Daily traffic
30
2022 count
Owner
County
County Highway Agency

About this bridge

County Road 13 over Trib N.Fk Lone Rock Crk is a steel stringer/multi-beam or girder carrying County Road 13 over Trib N.Fk Lone Rock Crk 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 30 vehicles a day, projected to reach 38 by 2042. The structure is 41 ft (12.5 m) long and 25 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesCounty Road 13
CrossesTrib N.Fk Lone Rock Crk
Location.2 S of CR X
RouteCounty Highway 0
CountyBaca County
StateColorado
Coordinates37.29016, -102.85082
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.4 US tons
Inventory rating27.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length41 ft (12.5 m)
Longest span37 ft (11.3 m)
Deck width25 ft (7.5 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2022)
Projected traffic38 by 2042
Trucks0%
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 County Road 13 over Trib N.Fk Lone Rock Crk built?

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

What condition is County Road 13 over Trib N.Fk Lone Rock Crk 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 13 over Trib N.Fk Lone Rock Crk carry?

About 30 vehicles per day (2022 count).

How long is County Road 13 over Trib N.Fk Lone Rock Crk?

The structure is 41 ft (12.5 m) long with a longest span of 37 ft (11.3 m) and a deck 25 ft wide.

Who owns County Road 13 over Trib N.Fk Lone Rock Crk?

It is owned by the County Highway Agency.