US Bridges

County RD 36.0 over Duran Arroyo

Poor

Las Animas County, Colorado · Between SH 350/CR85 · Structure no. LA68-43-18-68

Built
1950
75 years old
Condition
Poor
inspected June 2023
Type
Slab
Concrete
Length
23 ft
2 main spans
Daily traffic
56
2022 count
Owner
County
County Highway Agency

About this bridge

County RD 36.0 over Duran Arroyo is a concrete slab carrying County RD 36.0 over Duran Arroyo 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.

It carries about 56 vehicles a day, projected to reach 69 by 2042. The structure is 23 ft (7.1 m) long and 21 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesCounty RD 36.0
CrossesDuran Arroyo
LocationBetween SH 350/CR85
RouteCounty Highway 0
CountyLas Animas County
StateColorado
Coordinates37.24882, -104.37791
Functional classRural Local

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
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 rating40 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length23 ft (7.1 m)
Longest span10 ft (3 m)
Deck width21 ft (6.3 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic56 (2022)
Projected traffic69 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 36.0 over Duran Arroyo built?

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

What condition is County RD 36.0 over Duran Arroyo 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 36.0 over Duran Arroyo carry?

About 56 vehicles per day (2022 count).

How long is County RD 36.0 over Duran Arroyo?

The structure is 23 ft (7.1 m) long with a longest span of 10 ft (3 m) and a deck 21 ft wide.

Who owns County RD 36.0 over Duran Arroyo?

It is owned by the County Highway Agency.