US Bridges

31-Z001 over Unnamed Waterway

FairPosted for load

McKinley County, New Mexico · 1.2 MI W of Mck CO RD-1 · Structure no. 000000000007894

Built
1975
50 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
80 ft
3 main spans
Daily traffic
337
2023 count
Owner
County
County Highway Agency

About this bridge

31-Z001 over Unnamed Waterway is a steel continuous stringer/multi-beam or girder carrying 31-Z001 over Unnamed Waterway in McKinley County, New Mexico. It was built in 1975, so it is 50 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 fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 337 vehicles a day, projected to reach 458 by 2043. The structure is 80 ft (24.4 m) long and 16 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
Carries31-Z001
CrossesUnnamed Waterway
Location1.2 MI W of Mck CO RD-1
RouteCounty Highway 31001
CountyMcKinley County
StateNew Mexico
Coordinates35.51469, -108.93599
Functional classRural Local

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
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 rating28.5 US tons
Inventory rating16.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckOpen grating
Main spans3
Design loadH 15
Structure length80 ft (24.4 m)
Longest span34 ft (10.5 m)
Deck width16 ft (4.9 m)
Roadway width12 ft (3.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic337 (2023)
Projected traffic458 by 2043
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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$76,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 31-Z001 over Unnamed Waterway built?

It was built in 1975, making it 50 years old in 2025.

What condition is 31-Z001 over Unnamed Waterway 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 2024.

How much traffic does 31-Z001 over Unnamed Waterway carry?

About 337 vehicles per day (2023 count).

How long is 31-Z001 over Unnamed Waterway?

The structure is 80 ft (24.4 m) long with a longest span of 34 ft (10.5 m) and a deck 16 ft wide.

Who owns 31-Z001 over Unnamed Waterway?

It is owned by the County Highway Agency.