Structure F-16-HJ · Jefferson County, CO

I 70 Ml Ebnd over West 20th AVE

Carries I 70 Ml Ebnd over West 20th AVE, 1.6 Mi E Of Jct US 40.

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
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT143 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 6/9Substructure 6/9

143 ft end to end, longest span 65 ft. 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 tee-beam bridge.

Built196858 years old
Length142.7 ft43.5 m
Daily traffic45,500counted 2020
Last inspectedJanuary 2024every 24 months

Location

StateColorado
CountyJefferson
Location1.6 Mi E Of Jct US 40
CarriesI 70 Ml Ebnd
CrossesWest 20th AVE
Coordinates39.74715, -105.15070

Physical Characteristics

MaterialConcrete Continuous
DesignTee Beam
Total Length142.7 ft (43.5 m)
Max Span64.6 ft (19.7 m)
Deck Width54.1 ft (16.5 m)
Deck Area717.8 sq m
Main Spans3
Year Built1968

Traffic

Avg Daily Traffic45,500 (2020)
Truck Traffic8%
Lanes On Bridge3
Lanes Under Bridge2

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-HJ

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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