Structure N651 · McKinley County, NM

IRR BIA RTE N108 over Wash

Carries IRR BIA RTE N108 over Wash, In Tohatchi N.m..

Overall conditionPoor

Set by its lowest-rated component: Superstructure at 3 of 9.

How ratings work
Deck4/9 · Poor
Superstructuresets the rating3/9 · Serious
Substructure5/9 · Fair
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT107 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 4/9Superstructure 3/9 · sets the ratingSubstructure 5/9

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 through truss.

Built197650 years old
Length107.0 ft32.6 m
Daily traffic900counted 2023
Last inspectedMarch 2023every 12 months

Location

StateNew Mexico
CountyMcKinley
LocationIn Tohatchi N.m.
CarriesIRR BIA RTE N108
CrossesWash
Coordinates35.85622, -108.76364

Physical Characteristics

MaterialAluminum/Wrought Iron/Cast Iron
DesignTruss - Thru
Total Length107.0 ft (32.6 m)
Max Span102.7 ft (31.3 m)
Deck Width15.1 ft (4.6 m)
Deck Area150.0 sq m
Main Spans1
Year Built1976

Traffic

Avg Daily Traffic900 (2023)
Truck Traffic2%
Lanes On Bridge1

Inspection & Ownership

Last InspectionMarch 2023
Inspection FrequencyEvery 12 months
OwnerBureau of Indian Affairs
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number00000000000N651

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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