Structure F-16-KU · Jefferson County, CO

Alameda PKWY over SH 470 Ml

Carries Alameda PKWY over SH 470 Ml, 1.8 Mi S Of I-70/C470 Int.

Overall conditionFair

Set by its lowest-rated component: Deck at 6 of 9.

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT264 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

264 ft end to end, longest span 137 ft: about 4 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 box-beam bridge.

Built1988rebuilt 2008
Length264.1 ft80.5 m
Daily traffic9,959counted 2024
Last inspectedJanuary 2024every 24 months

Location

StateColorado
CountyJefferson
Location1.8 Mi S Of I-70/C470 Int
CarriesAlameda PKWY
CrossesSH 470 Ml
Coordinates39.68703, -105.18819

Physical Characteristics

MaterialPrestressed Concrete Continuous
DesignBox Beam - Multiple
Total Length264.1 ft (80.5 m)
Max Span137.1 ft (41.8 m)
Deck Width100.1 ft (30.5 m)
Deck Area2455.2 sq m
Main Spans2
Year Built1988 (reconstructed 2008)

Traffic

Avg Daily Traffic9,959 (2024)
Truck Traffic3%
Lanes On Bridge5
Lanes Under Bridge6

Inspection & Ownership

Last InspectionJanuary 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure NumberF-16-KU

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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