Structure 6765 · Sierra County, NM

Nm-1 over I-25 Nbl And Sbl

Carries Nm-1 over I-25 Nbl And Sbl, Junction I-25 And Nm-1.

Overall conditionFair

Set by its lowest-rated component: Deck at 5 of 9.

How ratings work
Decksets the rating5/9 · Fair
Superstructure6/9 · Satisfactory
Substructure6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT183 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 6/9Substructure 6/9

183 ft end to end, longest span 52 ft: about 3 semi-trucks nose to tail. Lengths and the semi-truck on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a multi-beam bridge.

Built196759 years old
Length183.1 ft55.8 m
Daily traffic20counted 2023
Last inspectedMarch 2023every 24 months

Location

StateNew Mexico
CountySierra
LocationJunction I-25 And Nm-1
CarriesNm-1
CrossesI-25 Nbl And Sbl
Coordinates33.33057, -107.29394

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length183.1 ft (55.8 m)
Max Span51.8 ft (15.8 m)
Deck Width35.1 ft (10.7 m)
Deck Area597.1 sq m
Main Spans4
Year Built1967

Traffic

Avg Daily Traffic20 (2023)
Truck Traffic10%
Lanes On Bridge2
Lanes Under Bridge4

Inspection & Ownership

Last InspectionMarch 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000006765

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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