US Bridges

NM-303 over South Diversion Channel

Fair

Bernalillo County, New Mexico · 1.7 MI S of JCT NM-500 · Structure no. 000000000007110

Built
1969
56 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
100 ft
1 main span
Daily traffic
4,170
2023 count
Owner
County
County Highway Agency

About this bridge

NM-303 over South Diversion Channel is a prestressed concrete stringer/multi-beam or girder carrying NM-303 over South Diversion Channel in Bernalillo County, New Mexico. It was built in 1969, so it is 56 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 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 4,170 vehicles a day, roughly 7% of them trucks, projected to reach 5,671 by 2043. The structure is 100 ft (30.5 m) long and 45 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesNM-303
CrossesSouth Diversion Channel
Location1.7 MI S of JCT NM-500
RouteCity Street 303
CountyBernalillo County
StateNew Mexico
Coordinates35.0027, -106.66286
Functional classUrban Collector

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.6 US tons
Inventory rating38 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length100 ft (30.5 m)
Longest span96 ft (29.3 m)
Deck width45 ft (13.7 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,170 (2023)
Projected traffic5,671 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$560,000 (2030 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was NM-303 over South Diversion Channel built?

It was built in 1969, making it 56 years old in 2025.

What condition is NM-303 over South Diversion Channel 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 March 2023.

How much traffic does NM-303 over South Diversion Channel carry?

About 4,170 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is NM-303 over South Diversion Channel?

The structure is 100 ft (30.5 m) long with a longest span of 96 ft (29.3 m) and a deck 45 ft wide.

Who owns NM-303 over South Diversion Channel?

It is owned by the County Highway Agency.