Structure F-19-C · Adams County, CO

US 36 Ml over Little Comanche Creek

Carries US 36 Ml over Little Comanche Creek, 0.5 Mi E Of Strasburg.

Overall conditionFair

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

How ratings work
Decksets the rating5/9 · Fair
Superstructure6/9 · Satisfactory
Substructure6/9 · Satisfactory
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT109 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 6/9Substructure 6/9

109 ft end to end, longest span 27 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.

Built193294 years old
Length108.9 ft33.2 m
Daily traffic3,400counted 2020
Last inspectedSeptember 2023every 24 months

Location

StateColorado
CountyAdams
Location0.5 Mi E Of Strasburg
CarriesUS 36 Ml
CrossesLittle Comanche Creek
Coordinates39.73838, -104.31616

Physical Characteristics

MaterialWood or Timber
DesignStringer/Multi-beam
Total Length108.9 ft (33.2 m)
Max Span26.9 ft (8.2 m)
Deck Width30.8 ft (9.4 m)
Deck Area312.1 sq m
Main Spans4
Year Built1932

Traffic

Avg Daily Traffic3,400 (2020)
Truck Traffic6%
Lanes On Bridge2

Inspection & Ownership

Last InspectionSeptember 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour Critical5 — Stable for scour
Structure NumberF-19-C

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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