Structure 8623 · Santa Fe County, NM

Nm-502 over Nm-4

Carries Nm-502 over Nm-4, Nm-4 & Nm-502 Interchange.

Overall conditionFair

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

How ratings work
Deck6/9 · Satisfactory
Superstructure7/9 · Good
Substructuresets the rating5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT107 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 7/9Substructure 5/9 · sets the rating

107 ft end to end. 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.

Built198838 years old
Length107.0 ft32.6 m
Daily traffic10,872counted 2023
Last inspectedFebruary 2024every 24 months

Location

StateNew Mexico
CountySanta Fe
LocationNm-4 & Nm-502 Interchange
CarriesNm-502
CrossesNm-4
Coordinates35.86941, -106.21546

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length107.0 ft (32.6 m)
Max Span107.0 ft (32.6 m)
Deck Width70.5 ft (21.5 m)
Deck Area700.9 sq m
Main Spans1
Year Built1988

Traffic

Avg Daily Traffic10,872 (2023)
Truck Traffic13%
Lanes On Bridge4
Lanes Under Bridge2

Inspection & Ownership

Last InspectionFebruary 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000008623

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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