Structure 7465 · San Juan County, NM

Nm-371 over Chaco River

Carries Nm-371 over Chaco River, 56.0 Mi N Of Jct I-40.

Overall conditionGood

Set by its lowest-rated component: Deck and Superstructure and Substructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT393 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

393 ft end to end, longest span 78 ft: about 5 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.

Built197947 years old
Length393.4 ft119.9 m
Daily traffic2,653counted 2023
Last inspectedSeptember 2023every 24 months

Location

StateNew Mexico
CountySan Juan
Location56.0 Mi N Of Jct I-40
CarriesNm-371
CrossesChaco River
Coordinates36.11410, -108.19103

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length393.4 ft (119.9 m)
Max Span78.1 ft (23.8 m)
Deck Width50.9 ft (15.5 m)
Deck Area1858.5 sq m
Main Spans5
Year Built1979

Traffic

Avg Daily Traffic2,653 (2023)
Truck Traffic11%
Lanes On Bridge2

Inspection & Ownership

Last InspectionSeptember 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number000000000007465

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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