US Bridges

NM-4 over Unnamed Waterway

Fair

Santa Fe County, New Mexico · 2.5 MI S of JCT NM-502 · Structure no. 000000000005694

Built
1949
76 years old
Condition
Fair
inspected October 2024
Type
Culvert
Concrete
Length
28 ft
3 main spans
Daily traffic
11,366
2023 count
Owner
State
State Highway Agency

About this bridge

NM-4 over Unnamed Waterway is a concrete culvert carrying NM-4 over Unnamed Waterway in Santa Fe County, New Mexico. It was built in 1949, so it is 76 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 11,366 vehicles a day, roughly 11% of them trucks, projected to reach 15,457 by 2043. The structure is 28 ft (8.4 m) long. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesNM-4
CrossesUnnamed Waterway
Location2.5 MI S of JCT NM-502
RouteState Highway 4
CountySanta Fe County
StateNew Mexico
Coordinates35.84268, -106.21169
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 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 rating55.3 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length28 ft (8.4 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 traffic11,366 (2023)
Projected traffic15,457 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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$124,000 (2030 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was NM-4 over Unnamed Waterway built?

It was built in 1949, making it 76 years old in 2025.

What condition is NM-4 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 October 2024.

How much traffic does NM-4 over Unnamed Waterway carry?

About 11,366 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is NM-4 over Unnamed Waterway?

The structure is 28 ft (8.4 m) long with a longest span of 6 ft (1.8 m).

Who owns NM-4 over Unnamed Waterway?

It is owned by the State Highway Agency.