US Bridges

US 160 Ml over Rio Grande

Fair

Alamosa County, Colorado · At East End of Alamosa · Structure no. O-13-B

Built
1966
59 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
304 ft
4 main spans
Daily traffic
13,000
2020 count
Owner
State
State Highway Agency

About this bridge

US 160 Ml over Rio Grande is a steel continuous stringer/multi-beam or girder carrying US 160 Ml over Rio Grande in Alamosa County, Colorado. It was built in 1966, so it is 59 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.

It carries about 13,000 vehicles a day, roughly 7% of them trucks, projected to reach 13,910 by 2040. The structure is 304 ft (92.6 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 160 Ml
CrossesRio Grande
LocationAt East End of Alamosa
RouteU.S. Route 160A
Coordinates37.46965, -105.86161
Functional classUrban Other Principal 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating48.2 US tons
Inventory rating28.8 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length304 ft (92.6 m)
Longest span82 ft (25.1 m)
Deck width36 ft (11 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,000 (2020)
Projected traffic13,910 by 2040
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$591,000
NavigationNo navigation control on waterway

Frequently asked questions

When was US 160 Ml over Rio Grande built?

It was built in 1966, making it 59 years old in 2025.

What condition is US 160 Ml over Rio Grande 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 March 2023.

How much traffic does US 160 Ml over Rio Grande carry?

About 13,000 vehicles per day (2020 count), of which roughly 7% are trucks.

How long is US 160 Ml over Rio Grande?

The structure is 304 ft (92.6 m) long with a longest span of 82 ft (25.1 m) and a deck 36 ft wide.

Who owns US 160 Ml over Rio Grande?

It is owned by the State Highway Agency.