US Bridges

US-84 over Unnamed Waterway

Good

Rio Arriba County, New Mexico · 0.10 MI S of JCT NM-554 · Structure no. 000000000003640

Built
1936
89 years old, rebuilt 1987
Condition
Good
inspected August 2023
Type
Culvert
Concrete
Length
55 ft
8 main spans
Daily traffic
5,440
2023 count
Owner
State
State Highway Agency

About this bridge

US-84 over Unnamed Waterway is a concrete culvert carrying US-84 over Unnamed Waterway in Rio Arriba County, New Mexico. It was built in 1936 and reconstructed in 1987, so it is 89 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 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 5,440 vehicles a day, roughly 11% of them trucks, projected to reach 7,398 by 2043. The structure is 55 ft (16.8 m) long. If it were closed, the detour would be 65.2 mi (105 km).

CarriesUS-84
CrossesUnnamed Waterway
Location0.10 MI S of JCT NM-554
RouteU.S. Route 84
Coordinates36.21065, -106.25447
Functional classRural Minor Arterial

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans8
Design loadH 15
Structure length55 ft (16.8 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 traffic5,440 (2023)
Projected traffic7,398 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed65.2 mi (105 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$451,000 (2030 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US-84 over Unnamed Waterway built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 1987.

What condition is US-84 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 2023.

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

About 5,440 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is US-84 over Unnamed Waterway?

The structure is 55 ft (16.8 m) long with a longest span of 6 ft (1.8 m).

Who owns US-84 over Unnamed Waterway?

It is owned by the State Highway Agency.