US Bridges

County RD 105.5 over Trib. San Francisco Crk

PoorPosted for load

Las Animas County, Colorado · .8 MI S of CR 22 · Structure no. LA105.5-48-10-E

Built
1950
75 years old
Condition
Poor
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
30 ft
1 main span
Daily traffic
22
2022 count
Owner
County
County Highway Agency

About this bridge

County RD 105.5 over Trib. San Francisco Crk is a steel stringer/multi-beam or girder carrying County RD 105.5 over Trib. San Francisco Crk in Las Animas County, Colorado. It was built in 1950, so it is 75 years old, older than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 22 vehicles a day, projected to reach 27 by 2042. The structure is 30 ft (9.2 m) long and 20 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

CarriesCounty RD 105.5
CrossesTrib. San Francisco Crk
Location.8 MI S of CR 22
RouteCounty Highway 0
Coordinates37.13581, -104.28828
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

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.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.5 US tons
Inventory rating25.4 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length30 ft (9.2 m)
Longest span28 ft (8.5 m)
Deck width20 ft (6.1 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22 (2022)
Projected traffic27 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$921,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 105.5 over Trib. San Francisco Crk built?

It was built in 1950, making it 75 years old in 2025.

What condition is County RD 105.5 over Trib. San Francisco Crk in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2023.

How much traffic does County RD 105.5 over Trib. San Francisco Crk carry?

About 22 vehicles per day (2022 count).

How long is County RD 105.5 over Trib. San Francisco Crk?

The structure is 30 ft (9.2 m) long with a longest span of 28 ft (8.5 m) and a deck 20 ft wide.

Who owns County RD 105.5 over Trib. San Francisco Crk?

It is owned by the County Highway Agency.