US Bridges

NM-30 over Unnamed Waterway

Fair

Rio Arriba County, New Mexico · 4.35 MI North JCT NM-502 · Structure no. 000000000007427

Built
1973
52 years old
Condition
Fair
inspected April 2024
Type
Culvert
Concrete
Length
66 ft
2 main spans
Daily traffic
8,929
2023 count
Owner
State
State Highway Agency

About this bridge

NM-30 over Unnamed Waterway is a concrete culvert carrying NM-30 over Unnamed Waterway in Rio Arriba County, New Mexico. It was built in 1973, so it is 52 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 6 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 8,929 vehicles a day, roughly 11% of them trucks, projected to reach 12,143 by 2043. The structure is 66 ft (20 m) long. If it were closed, the detour would be 24.9 mi (40 km).

Location

Open in Google Maps
CarriesNM-30
CrossesUnnamed Waterway
Location4.35 MI North JCT NM-502
RouteState Highway 30
CountyRio Arriba County
StateNew Mexico
Coordinates35.93663, -106.11876
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.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.7 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length66 ft (20 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,929 (2023)
Projected traffic12,143 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 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$300,000 (2030 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was NM-30 over Unnamed Waterway built?

It was built in 1973, making it 52 years old in 2025.

What condition is NM-30 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 April 2024.

How much traffic does NM-30 over Unnamed Waterway carry?

About 8,929 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is NM-30 over Unnamed Waterway?

The structure is 66 ft (20 m) long with a longest span of 10 ft (3 m).

Who owns NM-30 over Unnamed Waterway?

It is owned by the State Highway Agency.