US Bridges

US-550 over Unnamed Waterway

Good

Sandoval County, New Mexico · 14.6 MI NW of JCT I-25 · Structure no. 000000000007228

Built
1970
55 years old
Condition
Good
inspected July 2022
Type
Culvert
Concrete
Length
34 ft
5 main spans
Daily traffic
27,379
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 1970, so it is 55 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 27,379 vehicles a day, roughly 17% of them trucks, projected to reach 37,235 by 2043. The structure is 34 ft (10.4 m) long. If it were closed, the detour would be 98.8 mi (159 km).

CarriesUS-550
CrossesUnnamed Waterway
Location14.6 MI NW of JCT I-25
RouteU.S. Route 550
Coordinates35.46742, -106.6871
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionJuly 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable 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 spans5
Design loadHS 20
Structure length34 ft (10.4 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 traffic27,379 (2023)
Projected traffic37,235 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$209,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US-550 over Unnamed Waterway built?

It was built in 1970, making it 55 years old in 2025.

What condition is US-550 over Unnamed Waterway in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2022.

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

About 27,379 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is US-550 over Unnamed Waterway?

The structure is 34 ft (10.4 m) long with a longest span of 6 ft (1.8 m).

Who owns US-550 over Unnamed Waterway?

It is owned by the State Highway Agency.