Structure K-05-N · Montrose County, CO

US 550 Ml over Cedar Wash

Carries US 550 Ml over Cedar Wash, S. Side Of Montrose.

Overall conditionFair

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

How ratings work
Decksets the rating5/9 · Fair
Superstructure6/9 · Satisfactory
Substructure7/9 · Good
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT156 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 6/9Substructure 7/9

156 ft end to end, longest span 62 ft: about 2 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.

Built1936rebuilt 1975
Length156.5 ft47.7 m
Daily traffic25,000counted 2020
Last inspectedMarch 2024every 24 months

Location

StateColorado
CountyMontrose
LocationS. Side Of Montrose
CarriesUS 550 Ml
CrossesCedar Wash
Coordinates38.45348, -107.86640

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length156.5 ft (47.7 m)
Max Span62.0 ft (18.9 m)
Deck Width100.1 ft (30.5 m)
Deck Area1454.8 sq m
Main Spans3
Year Built1936 (reconstructed 1975)

Traffic

Avg Daily Traffic25,000 (2020)
Truck Traffic6%
Lanes On Bridge5

Inspection & Ownership

Last InspectionMarch 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure NumberK-05-N

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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