Structure F-15-BA · Jefferson County, CO

US 6 Ml over Clear Creek

Carries US 6 Ml over Clear Creek, 6.9 Mi E Of Jct SH 119.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructure6/9 · Satisfactory
Substructuresets the rating5/9 · Fair
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT166 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9Substructure 5/9 · sets the rating

166 ft end to end: 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.

Built1950rebuilt 2006
Length166.0 ft50.6 m
Daily traffic7,500counted 2020
Last inspectedNovember 2023every 24 months

Location

StateColorado
CountyJefferson
Location6.9 Mi E Of Jct SH 119
CarriesUS 6 Ml
CrossesClear Creek
Coordinates39.74367, -105.29816

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length166.0 ft (50.6 m)
Max Span149.9 ft (45.7 m)
Deck Width37.4 ft (11.4 m)
Deck Area576.8 sq m
Main Spans1
Year Built1950 (reconstructed 2006)

Traffic

Avg Daily Traffic7,500 (2020)
Truck Traffic8%
Lanes On Bridge2

Inspection & Ownership

Last InspectionNovember 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is eligible for the National Register
Scour Critical8 — Stable, low risk
Structure NumberF-15-BA

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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