Structure G-17-AL · Douglas County, CO

SH 105 Ml over Draw

Carries SH 105 Ml over Draw, 2.7 Me S Of Jct SH 67.

Overall conditionPoor

Set by its lowest-rated component: Superstructure at 4 of 9.

How ratings work
Deck5/9 · Fair
Superstructuresets the rating4/9 · Poor
Substructure5/9 · Fair
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT94 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9Superstructure 4/9 · sets the ratingSubstructure 5/9

94 ft end to end, longest span 23 ft. 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.

Built193888 years old
Length93.5 ft28.5 m
Daily traffic2,600counted 2020
Last inspectedMarch 2024every 12 months

Location

StateColorado
CountyDouglas
Location2.7 Me S Of Jct SH 67
CarriesSH 105 Ml
CrossesDraw
Coordinates39.39421, -104.94990

Physical Characteristics

MaterialWood or Timber
DesignStringer/Multi-beam
Total Length93.5 ft (28.5 m)
Max Span23.0 ft (7 m)
Deck Width25.9 ft (7.9 m)
Deck Area225.2 sq m
Main Spans4
Year Built1938

Traffic

Avg Daily Traffic2,600 (2020)
Truck Traffic5%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMarch 2024
Inspection FrequencyEvery 12 months
OwnerState Highway Agency
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour Critical3 — Scour critical
Structure NumberG-17-AL

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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