US Bridges

US 350 Ml over Crooked Arroyo

FairPosted for load

Otero County, Colorado · 2.3 MI NE of JCT SH 71 · Structure no. M-22-T

Built
1935
90 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
114 ft
5 main spans
Daily traffic
320
2020 count
Owner
State
State Highway Agency

About this bridge

US 350 Ml over Crooked Arroyo is a wood or timber stringer/multi-beam or girder carrying US 350 Ml over Crooked Arroyo in Otero County, Colorado. It was built in 1935, so it is 90 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 320 vehicles a day, roughly 13% of them trucks, projected to reach 416 by 2040. The structure is 114 ft (34.6 m) long and 26 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesUS 350 Ml
CrossesCrooked Arroyo
Location2.3 MI NE of JCT SH 71
RouteU.S. Route 350A
CountyOtero County
StateColorado
Coordinates37.87525, -103.69757
Functional classRural Minor Arterial

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being 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 rating34.5 US tons
Inventory rating23.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans5
Design loadH 15
Structure length114 ft (34.6 m)
Longest span26 ft (7.8 m)
Deck width26 ft (7.9 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic320 (2020)
Projected traffic416 by 2040
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 350 Ml over Crooked Arroyo built?

It was built in 1935, making it 90 years old in 2025.

What condition is US 350 Ml over Crooked Arroyo 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 August 2024.

How much traffic does US 350 Ml over Crooked Arroyo carry?

About 320 vehicles per day (2020 count), of which roughly 13% are trucks.

How long is US 350 Ml over Crooked Arroyo?

The structure is 114 ft (34.6 m) long with a longest span of 26 ft (7.8 m) and a deck 26 ft wide.

Who owns US 350 Ml over Crooked Arroyo?

It is owned by the State Highway Agency.