US Bridges

45-4450 over Blanco Canyon

Good

San Juan County, New Mexico · 7.4 MI S JCT US-64 · Structure no. 000000000009504

Built
2011
14 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
171 ft
2 main spans
Daily traffic
681
2023 count
Owner
County
County Highway Agency

About this bridge

45-4450 over Blanco Canyon is a prestressed concrete continuous stringer/multi-beam or girder carrying 45-4450 over Blanco Canyon in San Juan County, New Mexico. It was built in 2011, so it is 14 years old, younger than the New Mexico average of 51.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 681 vehicles a day, projected to reach 926 by 2043. The structure is 171 ft (52.2 m) long and 18 ft wide. If it were closed, the detour would be 70.2 mi (113 km).

Location

Open in Google Maps
Carries45-4450
CrossesBlanco Canyon
Location7.4 MI S JCT US-64
RouteCounty Highway 45450
CountySan Juan County
StateNew Mexico
Coordinates36.65892, -107.71681
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating59.4 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length171 ft (52.2 m)
Longest span85 ft (25.9 m)
Deck width18 ft (5.5 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic681 (2023)
Projected traffic926 by 2043
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed70.2 mi (113 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$400,000 (2070 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 45-4450 over Blanco Canyon built?

It was built in 2011, making it 14 years old in 2025.

What condition is 45-4450 over Blanco Canyon in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2023.

How much traffic does 45-4450 over Blanco Canyon carry?

About 681 vehicles per day (2023 count).

How long is 45-4450 over Blanco Canyon?

The structure is 171 ft (52.2 m) long with a longest span of 85 ft (25.9 m) and a deck 18 ft wide.

Who owns 45-4450 over Blanco Canyon?

It is owned by the County Highway Agency.