US Bridges

CR B-31 over Irrigation Canal

Fair

Dona Ana County, New Mexico · 0.3 MI E NM-478 @ MP 11.0 · Structure no. 000000000007701

Built
1974
51 years old
Condition
Fair
inspected November 2023
Type
Tee Beam
Prestressed Concrete
Length
34 ft
1 main span
Daily traffic
337
2023 count
Owner
County
County Highway Agency

About this bridge

CR B-31 over Irrigation Canal is a prestressed concrete tee beam carrying CR B-31 over Irrigation Canal in Dona Ana County, New Mexico. It was built in 1974, so it is 51 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 337 vehicles a day, projected to reach 458 by 2043. The structure is 34 ft (10.3 m) long and 25 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCR B-31
CrossesIrrigation Canal
Location0.3 MI E NM-478 @ MP 11.0
RouteCounty Highway 13031
CountyDona Ana County
StateNew Mexico
Coordinates32.14664, -106.68093
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31.7 US tons
Inventory rating17.6 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length34 ft (10.3 m)
Longest span30 ft (9.1 m)
Deck width25 ft (7.6 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic337 (2023)
Projected traffic458 by 2043
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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$50,000 (2030 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was CR B-31 over Irrigation Canal built?

It was built in 1974, making it 51 years old in 2025.

What condition is CR B-31 over Irrigation Canal 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 November 2023.

How much traffic does CR B-31 over Irrigation Canal carry?

About 337 vehicles per day (2023 count).

How long is CR B-31 over Irrigation Canal?

The structure is 34 ft (10.3 m) long with a longest span of 30 ft (9.1 m) and a deck 25 ft wide.

Who owns CR B-31 over Irrigation Canal?

It is owned by the County Highway Agency.