US Bridges

US-550 over Rio Salado

Fair

Sandoval County, New Mexico · 22.7 MI N JCT I-25 US 550 · Structure no. 000000000007549

Built
1979
46 years old, rebuilt 1998
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
448 ft
8 main spans
Daily traffic
9,796
2023 count
Owner
State
State Highway Agency

About this bridge

US-550 over Rio Salado is a prestressed concrete continuous stringer/multi-beam or girder carrying US-550 over Rio Salado in Sandoval County, New Mexico. It was built in 1979 and reconstructed in 1998, so it is 46 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 9,796 vehicles a day, roughly 17% of them trucks, projected to reach 13,322 by 2043. The structure is 448 ft (136.6 m) long and 70 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesUS-550
CrossesRio Salado
Location22.7 MI N JCT I-25 US 550
RouteU.S. Route 550
Coordinates35.54458, -106.78222
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 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 alignment8: Equal to present desirable criteria
Operating rating61.4 US tons
Inventory rating38 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadHS 20
Structure length448 ft (136.6 m)
Longest span58 ft (17.6 m)
Deck width70 ft (21.3 m)
Roadway width67 ft (20.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,796 (2023)
Projected traffic13,322 by 2043
Trucks17%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

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$2.3 million (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US-550 over Rio Salado built?

It was built in 1979, making it 46 years old in 2025. It was reconstructed in 1998.

What condition is US-550 over Rio Salado 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 September 2024.

How much traffic does US-550 over Rio Salado carry?

About 9,796 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is US-550 over Rio Salado?

The structure is 448 ft (136.6 m) long with a longest span of 58 ft (17.6 m) and a deck 70 ft wide.

Who owns US-550 over Rio Salado?

It is owned by the State Highway Agency.