US Bridges

IRR/US-491 over Unnamed Waterway

Good

McKinley County, New Mexico · 20.6 MI N of I-40 · Structure no. 000000000009760

Built
2018
7 years old
Condition
Good
inspected August 2022
Type
Culvert
Concrete
Length
40 ft
4 main spans
Daily traffic
5,457
2018 count
Owner
State
State Highway Agency

About this bridge

IRR/US-491 over Unnamed Waterway is a concrete culvert carrying IRR/US-491 over Unnamed Waterway in McKinley County, New Mexico. It was built in 2018, so it is 7 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 5,457 vehicles a day, roughly 15% of them trucks, projected to reach 7,206 by 2038. The structure is 40 ft (12.2 m) long and 145 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesIRR/US-491
CrossesUnnamed Waterway
Location20.6 MI N of I-40
RouteU.S. Route 491
CountyMcKinley County
StateNew Mexico
Coordinates35.81713, -108.76444
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionAugust 2022
Inspection intervalevery 48 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating94.7 US tons
Inventory rating56.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadHL 93
Structure length40 ft (12.2 m)
Longest span10 ft (3 m)
Deck width145 ft (44.2 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,457 (2018)
Projected traffic7,206 by 2038
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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-491 over Unnamed Waterway built?

It was built in 2018, making it 7 years old in 2025.

What condition is IRR/US-491 over Unnamed Waterway 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 August 2022.

How much traffic does IRR/US-491 over Unnamed Waterway carry?

About 5,457 vehicles per day (2018 count), of which roughly 15% are trucks.

How long is IRR/US-491 over Unnamed Waterway?

The structure is 40 ft (12.2 m) long with a longest span of 10 ft (3 m) and a deck 145 ft wide.

Who owns IRR/US-491 over Unnamed Waterway?

It is owned by the State Highway Agency.