Structure E-24-93 · Jefferson County, CO

W 58th Drive over Boulder Diversion Canal

Carries W 58th Drive over Boulder Diversion Canal, 1.1 Mi E Of HWY 93.

Overall conditionFair

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

How ratings work
Decksets the rating5/9 · Fair
Superstructure8/9 · Very Good
Substructure7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT26 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 8/9Substructure 7/9

26 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.

Built197650 years old
Length26.2 ft8 m
Daily traffic5,380counted 2021
Last inspectedFebruary 2025every 24 months

Location

StateColorado
CountyJefferson
Location1.1 Mi E Of HWY 93
CarriesW 58th Drive
CrossesBoulder Diversion Canal
Coordinates39.80467, -105.20440

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length26.2 ft (8 m)
Max Span22.6 ft (6.9 m)
Deck Width54.5 ft (16.6 m)
Deck Area132.8 sq m
Main Spans1
Year Built1976

Traffic

Avg Daily Traffic5,380 (2021)
Truck Traffic9%
Lanes On Bridge2

Inspection & Ownership

Last InspectionFebruary 2025
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure NumberE-24-93

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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