US Bridges

US-550 Sbl over Hampton Arroyo

Fair

San Juan County, New Mexico · 0.70 MI N of JCT Nm 516 · Structure no. 000000000006221

Built
1961
64 years old
Condition
Fair
inspected May 2023
Type
Slab
Concrete Continuous
Length
118 ft
7 main spans
Daily traffic
15,330
2023 count
Owner
State
State Highway Agency

About this bridge

US-550 Sbl over Hampton Arroyo is a concrete continuous slab carrying US-550 Sbl over Hampton Arroyo in San Juan County, New Mexico. It was built in 1961, so it is 64 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 5 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 15,330 vehicles a day, roughly 12% of them trucks, projected to reach 20,848 by 2043. The structure is 118 ft (36 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS-550 Sbl
CrossesHampton Arroyo
Location0.70 MI N of JCT Nm 516
RouteU.S. Route 550
CountySan Juan County
StateNew Mexico
Coordinates36.83099, -107.98233
Functional classUrban Other Principal 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating45.2 US tons
Inventory rating27.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length118 ft (36 m)
Longest span17 ft (5.2 m)
Deck width41 ft (12.4 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,330 (2023)
Projected traffic20,848 by 2043
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$357,000 (2030 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US-550 Sbl over Hampton Arroyo built?

It was built in 1961, making it 64 years old in 2025.

What condition is US-550 Sbl over Hampton Arroyo 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 May 2023.

How much traffic does US-550 Sbl over Hampton Arroyo carry?

About 15,330 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is US-550 Sbl over Hampton Arroyo?

The structure is 118 ft (36 m) long with a longest span of 17 ft (5.2 m) and a deck 41 ft wide.

Who owns US-550 Sbl over Hampton Arroyo?

It is owned by the State Highway Agency.