Structure 47360 · Scott County, IA

I 74 EB over US 6 (spruce Hills)

Carries I 74 EB over US 6 (spruce Hills), 2.6 Mi. E Of Jct. I-80.

Overall conditionFair

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

How ratings work
Decksets the rating5/9 · Fair
Superstructure6/9 · Satisfactory
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT227 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 6/9Substructure 7/9

227 ft end to end, longest span 73 ft: about 3 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.

Built197155 years old
Length227.0 ft69.2 m
Daily traffic17,500counted 2022
Last inspectedFebruary 2024every 24 months

Location

StateIowa
CountyScott
Location2.6 Mi. E Of Jct. I-80
CarriesI 74 EB
CrossesUS 6 (spruce Hills)
Coordinates41.55523, -90.52214

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length227.0 ft (69.2 m)
Max Span73.2 ft (22.3 m)
Deck Width52.2 ft (15.9 m)
Deck Area1100.3 sq m
Main Spans4
Year Built1971

Traffic

Avg Daily Traffic17,500 (2022)
Truck Traffic8%
Lanes On Bridge3
Lanes Under Bridge5

Inspection & Ownership

Last InspectionFebruary 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000047360

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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