Structure 8604 · McKinley County, NM

Nm-371 over First Street

Carries Nm-371 over First Street, 0.38 Mi N Of I-40/THOREAU.

Overall conditionFair

Set by its lowest-rated component: Deck at 6 of 9.

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT102 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

102 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.

Built198640 years old
Length102.0 ft31.1 m
Daily traffic3,698counted 2023
Last inspectedJuly 2024every 24 months

Location

StateNew Mexico
CountyMcKinley
Location0.38 Mi N Of I-40/THOREAU
CarriesNm-371
CrossesFirst Street
Coordinates35.40156, -108.22377

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length102.0 ft (31.1 m)
Max Span98.1 ft (29.9 m)
Deck Width56.1 ft (17.1 m)
Deck Area531.8 sq m
Main Spans1
Year Built1986

Traffic

Avg Daily Traffic3,698 (2023)
Truck Traffic11%
Lanes On Bridge2
Lanes Under Bridge2

Inspection & Ownership

Last InspectionJuly 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000008604

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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