US Bridges

US-64/84 over Unnamed Waterway

Fair

Rio Arriba County, New Mexico · 3.65 MI S of JCT NM-17 · Structure no. 000000000003657

Built
1939
86 years old
Condition
Fair
inspected November 2024
Type
Culvert
Concrete
Length
39 ft
6 main spans
Daily traffic
2,565
2023 count
Owner
State
State Highway Agency

About this bridge

US-64/84 over Unnamed Waterway is a concrete culvert carrying US-64/84 over Unnamed Waterway in Rio Arriba County, New Mexico. It was built in 1939, so it is 86 years old, older 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 2,565 vehicles a day, roughly 11% of them trucks, projected to reach 3,488 by 2043. The structure is 39 ft (11.8 m) long. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesUS-64/84
CrossesUnnamed Waterway
Location3.65 MI S of JCT NM-17
RouteU.S. Route 64
CountyRio Arriba County
StateNew Mexico
Coordinates36.8302, -106.56904
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans6
Design loadH 15
Structure length39 ft (11.8 m)
Longest span6 ft (1.8 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,565 (2023)
Projected traffic3,488 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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$190,000 (2030 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US-64/84 over Unnamed Waterway built?

It was built in 1939, making it 86 years old in 2025.

What condition is US-64/84 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 November 2024.

How much traffic does US-64/84 over Unnamed Waterway carry?

About 2,565 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is US-64/84 over Unnamed Waterway?

The structure is 39 ft (11.8 m) long with a longest span of 6 ft (1.8 m).

Who owns US-64/84 over Unnamed Waterway?

It is owned by the State Highway Agency.