US Bridges

31-0077 over Rio Puerco

Fair

McKinley County, New Mexico · 1.05 MI W NM-566 @ MP-5.5 · Structure no. 000000000008970

Built
1995
30 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
110 ft
7 main spans
Daily traffic
337
2023 count
Owner
County
County Highway Agency

About this bridge

31-0077 over Rio Puerco is a steel continuous stringer/multi-beam or girder carrying 31-0077 over Rio Puerco in McKinley County, New Mexico. It was built in 1995, so it is 30 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 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 337 vehicles a day, projected to reach 458 by 2043. The structure is 110 ft (33.6 m) long and 13 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
Carries31-0077
CrossesRio Puerco
Location1.05 MI W NM-566 @ MP-5.5
RouteCounty Highway 31011
CountyMcKinley County
StateNew Mexico
Coordinates35.59976, -108.58721
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being 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 rating78.6 US tons
Inventory rating57.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckOpen grating
Main spans7
Design loadUnknown
Structure length110 ft (33.6 m)
Longest span20 ft (6.2 m)
Deck width13 ft (4.1 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 closed5 mi (8 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$87,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 31-0077 over Rio Puerco built?

It was built in 1995, making it 30 years old in 2025.

What condition is 31-0077 over Rio Puerco 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 September 2024.

How much traffic does 31-0077 over Rio Puerco carry?

About 337 vehicles per day (2023 count).

How long is 31-0077 over Rio Puerco?

The structure is 110 ft (33.6 m) long with a longest span of 20 ft (6.2 m) and a deck 13 ft wide.

Who owns 31-0077 over Rio Puerco?

It is owned by the County Highway Agency.