US Bridges

State HWY 433 over South Canadian River

FairPosted for load

San Miguel County, New Mexico · Conchas Dam · Structure no. CEPSWANM-000001

Built
1940
85 years old
Condition
Fair
inspected May 2024
Type
Arch - Deck
Concrete
Length
350 ft
5 main spans
Daily traffic
150
2003 count
Owner
Federal
Corps of Engineers (Civil)

About this bridge

State HWY 433 over South Canadian River is a concrete arch - deck carrying State HWY 433 over South Canadian River in San Miguel County, New Mexico. It was built in 1940, so it is 85 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. Its operating status is: posted for load restriction.

It carries about 150 vehicles a day, roughly 20% of them trucks, projected to reach 175 by 2041. The structure is 350 ft (106.6 m) long and 25 ft wide. If it were closed, the detour would be 96.9 mi (156 km).

Location

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CarriesState HWY 433
CrossesSouth Canadian River
LocationConchas Dam
RouteState Highway 433
CountySan Miguel County
StateNew Mexico
Coordinates35.40279, -104.19055
Functional classRural Local

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating16.8 US tons
Inventory rating12.9 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadUnknown
Structure length350 ft (106.6 m)
Longest span70 ft (21.3 m)
Deck width25 ft (7.6 m)
Roadway width18 ft (5.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2003)
Projected traffic175 by 2041
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
Detour if closed96.9 mi (156 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCorps of Engineers (Civil)
Maintained byCorps of Engineers (Civil)
Historic statusListed on the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$58,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was State HWY 433 over South Canadian River built?

It was built in 1940, making it 85 years old in 2025.

What condition is State HWY 433 over South Canadian 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 May 2024.

How much traffic does State HWY 433 over South Canadian River carry?

About 150 vehicles per day (2003 count), of which roughly 20% are trucks.

How long is State HWY 433 over South Canadian River?

The structure is 350 ft (106.6 m) long with a longest span of 70 ft (21.3 m) and a deck 25 ft wide.

Who owns State HWY 433 over South Canadian River?

It is owned by the Corps of Engineers (Civil).