Structure 1F 818 · Utah County, UT

I-15 (sr-15) Nbl over 400 North Street

Carries I-15 (sr-15) Nbl over 400 North Street, I-15 & 400 North In O.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructuresets the rating6/9 · Satisfactory
Substructure8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT106 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9 · sets the ratingSubstructure 8/9

106 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.

Built201115 years old
Length106.0 ft32.3 m
Daily traffic152,799counted 2022
Last inspectedJanuary 2023every 24 months

Location

StateUtah
CountyUtah
LocationI-15 & 400 North In O
CarriesI-15 (sr-15) Nbl
Crosses400 North Street
Coordinates40.30429, -111.72566

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length106.0 ft (32.3 m)
Max Span103.0 ft (31.4 m)
Deck Width112.5 ft (34.3 m)
Deck Area1107.9 sq m
Main Spans1
Year Built2011

Traffic

Avg Daily Traffic152,799 (2022)
Truck Traffic20%
Lanes On Bridge7
Lanes Under Bridge2

Inspection & Ownership

Last InspectionJanuary 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number1F 818

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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