US Bridges

US-550 over Unnamed Waterway

Fair

Sandoval County, New Mexico · 27.7 MI NW of JCT I-25 · Structure no. 000000000007953

Built
1977
48 years old
Condition
Fair
inspected August 2021
Type
Culvert
Concrete
Length
48 ft
4 main spans
Daily traffic
5,416
2023 count
Owner
State
State Highway Agency

About this bridge

US-550 over Unnamed Waterway is a concrete culvert carrying US-550 over Unnamed Waterway in Sandoval County, New Mexico. It was built in 1977, so it is 48 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 5,416 vehicles a day, roughly 17% of them trucks, projected to reach 7,365 by 2043. The structure is 48 ft (14.7 m) long. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesUS-550
CrossesUnnamed Waterway
Location27.7 MI NW of JCT I-25
RouteU.S. Route 550
CountySandoval County
StateNew Mexico
Coordinates35.54609, -106.8455
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadHS 20
Structure length48 ft (14.7 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 traffic5,416 (2023)
Projected traffic7,365 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

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$564,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US-550 over Unnamed Waterway built?

It was built in 1977, making it 48 years old in 2025.

What condition is US-550 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 August 2021.

How much traffic does US-550 over Unnamed Waterway carry?

About 5,416 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is US-550 over Unnamed Waterway?

The structure is 48 ft (14.7 m) long with a longest span of 10 ft (3 m).

Who owns US-550 over Unnamed Waterway?

It is owned by the State Highway Agency.