Structure 6266 · Union County, NM

Nm-456 over Unnamed Waterway

Carries Nm-456 over Unnamed Waterway, 27.7 M NE Of Jct Us-64/87.

Overall conditionFair

Set by its lowest-rated component: Superstructure and Substructure at 5 of 9.

How ratings work
Deck6/9 · Satisfactory
Superstructuresets the rating5/9 · Fair
Substructuresets the rating5/9 · Fair
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT63 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 5/9 · sets the ratingSubstructure 5/9 · sets the rating

63 ft end to end, longest span 31 ft. Lengths and the car 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.

Built196165 years old
Length63.0 ft19.2 m
Daily traffic73counted 2023
Last inspectedApril 2024every 24 months

Location

StateNew Mexico
CountyUnion
Location27.7 M NE Of Jct Us-64/87
CarriesNm-456
CrossesUnnamed Waterway
Coordinates36.91266, -103.66685

Physical Characteristics

MaterialWood or Timber
DesignStringer/Multi-beam
Total Length63.0 ft (19.2 m)
Max Span30.8 ft (9.4 m)
Deck Width33.1 ft (10.1 m)
Deck Area193.9 sq m
Main Spans2
Year Built1961

Traffic

Avg Daily Traffic73 (2023)
Truck Traffic10%
Lanes On Bridge2

Inspection & Ownership

Last InspectionApril 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour CriticalUnknown
Structure Number000000000006266

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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