US Bridges

County RD 105.5 over Thompson Creek

Poor

Las Animas County, Colorado · 1.1 MI SE of CR 12.5 · Structure no. LA105.5-50-8-84

Built
1930
95 years old
Condition
Poor
inspected June 2023
Type
Truss - Thru
Steel
Length
52 ft
1 main span
Daily traffic
13
2022 count
Owner
County
County Highway Agency

About this bridge

County RD 105.5 over Thompson Creek is a steel truss - thru carrying County RD 105.5 over Thompson Creek in Las Animas County, Colorado. It was built in 1930, so it is 95 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: open, posting recommended but not legally implemented.

It carries about 13 vehicles a day, projected to reach 15 by 2042. The structure is 52 ft (15.7 m) long and 19 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

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CarriesCounty RD 105.5
CrossesThompson Creek
Location1.1 MI SE of CR 12.5
RouteCounty Highway 0
CountyLas Animas County
StateColorado
Coordinates37.10788, -104.25116
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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, posting recommended but not legally implemented
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating14.6 US tons
Inventory rating8.7 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length52 ft (15.7 m)
Longest span49 ft (15 m)
Deck width19 ft (5.9 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13 (2022)
Projected traffic15 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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$1.3 million (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 105.5 over Thompson Creek built?

It was built in 1930, making it 95 years old in 2025.

What condition is County RD 105.5 over Thompson Creek 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 Thompson Creek carry?

About 13 vehicles per day (2022 count).

How long is County RD 105.5 over Thompson Creek?

The structure is 52 ft (15.7 m) long with a longest span of 49 ft (15 m) and a deck 19 ft wide.

Who owns County RD 105.5 over Thompson Creek?

It is owned by the County Highway Agency.