Structure 12264 · Ada County, ID

US 20 Wbl & Ebl over Sma 9083;27th Street

Carries US 20 Wbl & Ebl over Sma 9083;27th Street, In Boise;boise Connector.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure8/9 · Very Good
Substructure8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT87 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 8/9Substructure 8/9

87 ft end to end. 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.

Built199036 years old
Length86.9 ft26.5 m
Daily traffic37,500counted 2023
Last inspectedApril 2021every 48 months

Location

StateIdaho
CountyAda
LocationIn Boise;boise Connector
CarriesUS 20 Wbl & Ebl
CrossesSma 9083;27th Street
Coordinates43.61907, -116.22401

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length86.9 ft (26.5 m)
Max Span84.0 ft (25.6 m)
Deck Width110.9 ft (33.8 m)
Deck Area895.7 sq m
Main Spans1
Year Built1990

Traffic

Avg Daily Traffic37,500 (2023)
Truck Traffic4%
Lanes On Bridge6
Lanes Under Bridge4

Inspection & Ownership

Last InspectionApril 2021
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour CriticalNot applicable
Structure Number000000000012264

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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