US Bridges

Irr# US 160 Ml over San Juan River

Fair

Montezuma County, Colorado · 0.2 MI No of New Mexico S · Structure no. P-01-G

Built
1961
64 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
606 ft
5 main spans
Daily traffic
1,600
2020 count
Owner
State
State Highway Agency

About this bridge

Irr# US 160 Ml over San Juan River is a steel continuous stringer/multi-beam or girder carrying Irr# US 160 Ml over San Juan River in Montezuma County, Colorado. It was built in 1961, so it is 64 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 1,600 vehicles a day, roughly 8% of them trucks, projected to reach 1,840 by 2040. The structure is 606 ft (184.6 m) long and 34 ft wide. If it were closed, the detour would be 62.1 mi (100 km).

CarriesIrr# US 160 Ml
CrossesSan Juan River
Location0.2 MI No of New Mexico S
RouteU.S. Route 160A
Coordinates37.00148, -109.03271
Functional classRural Principal Arterial - Other

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.2 US tons
Inventory rating32 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length606 ft (184.6 m)
Longest span130 ft (39.6 m)
Deck width34 ft (10.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,600 (2020)
Projected traffic1,840 by 2040
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed62.1 mi (100 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Irr# US 160 Ml over San Juan River built?

It was built in 1961, making it 64 years old in 2025.

What condition is Irr# US 160 Ml over San Juan River 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 October 2023.

How much traffic does Irr# US 160 Ml over San Juan River carry?

About 1,600 vehicles per day (2020 count), of which roughly 8% are trucks.

How long is Irr# US 160 Ml over San Juan River?

The structure is 606 ft (184.6 m) long with a longest span of 130 ft (39.6 m) and a deck 34 ft wide.

Who owns Irr# US 160 Ml over San Juan River?

It is owned by the State Highway Agency.