US Bridges

NM-518 over Sapello River

Fair

San Miguel County, New Mexico · 0.2 MI S of JCT NM-94 · Structure no. 000000000007650

Built
1978
47 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
206 ft
3 main spans
Daily traffic
3,703
2023 count
Owner
State
State Highway Agency

About this bridge

NM-518 over Sapello River is a prestressed concrete continuous stringer/multi-beam or girder carrying NM-518 over Sapello River in San Miguel County, New Mexico. It was built in 1978, so it is 47 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 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 3,703 vehicles a day, roughly 11% of them trucks, projected to reach 5,036 by 2043. The structure is 206 ft (62.8 m) long and 50 ft wide. If it were closed, the detour would be 54.1 mi (87 km).

CarriesNM-518
CrossesSapello River
Location0.2 MI S of JCT NM-94
RouteState Highway 518
Coordinates35.76993, -105.25214
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating69.9 US tons
Inventory rating40.1 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length206 ft (62.8 m)
Longest span73 ft (22.3 m)
Deck width50 ft (15.2 m)
Roadway width48 ft (14.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,703 (2023)
Projected traffic5,036 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed54.1 mi (87 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was NM-518 over Sapello River built?

It was built in 1978, making it 47 years old in 2025.

What condition is NM-518 over Sapello River 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 June 2024.

How much traffic does NM-518 over Sapello River carry?

About 3,703 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is NM-518 over Sapello River?

The structure is 206 ft (62.8 m) long with a longest span of 73 ft (22.3 m) and a deck 50 ft wide.

Who owns NM-518 over Sapello River?

It is owned by the State Highway Agency.