US Bridges

IRR/US-491 Sbl over Captain Tom Wash

Good

San Juan County, New Mexico · 9.7 Miles North of Nm 134 · Structure no. 000000000008009

Built
1979
46 years old
Condition
Good
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
192 ft
3 main spans
Daily traffic
6,055
2023 count
Owner
State
State Highway Agency

About this bridge

IRR/US-491 Sbl over Captain Tom Wash is a prestressed concrete continuous stringer/multi-beam or girder carrying IRR/US-491 Sbl over Captain Tom Wash in San Juan County, New Mexico. It was built in 1979, so it is 46 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 6,055 vehicles a day, roughly 17% of them trucks, projected to reach 8,234 by 2043. The structure is 192 ft (58.4 m) long and 48 ft wide.

Location

Open in Google Maps
CarriesIRR/US-491 Sbl
CrossesCaptain Tom Wash
Location9.7 Miles North of Nm 134
RouteU.S. Route 491
CountySan Juan County
StateNew Mexico
Coordinates36.28612, -108.70534
Functional classRural Principal Arterial - Other

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating37.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length192 ft (58.4 m)
Longest span66 ft (20.1 m)
Deck width48 ft (14.5 m)
Roadway width45 ft (13.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,055 (2023)
Projected traffic8,234 by 2043
Trucks17%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate 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-491 Sbl over Captain Tom Wash built?

It was built in 1979, making it 46 years old in 2025.

What condition is IRR/US-491 Sbl over Captain Tom Wash 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 November 2024.

How much traffic does IRR/US-491 Sbl over Captain Tom Wash carry?

About 6,055 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is IRR/US-491 Sbl over Captain Tom Wash?

The structure is 192 ft (58.4 m) long with a longest span of 66 ft (20.1 m) and a deck 48 ft wide.

Who owns IRR/US-491 Sbl over Captain Tom Wash?

It is owned by the State Highway Agency.