Structure 607865 · Hardin County, IA

US 20 EB over D 35 (elm St)

Carries US 20 EB over D 35 (elm St), 3.4 Miles E Of Jct US 65.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructuresets the rating6/9 · Satisfactory
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT184 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9 · sets the ratingSubstructure 7/9

184 ft end to end, longest span 67 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.

Built200323 years old
Length184.1 ft56.1 m
Daily traffic4,900counted 2022
Last inspectedAugust 2024every 24 months

Location

StateIowa
CountyHardin
Location3.4 Miles E Of Jct US 65
CarriesUS 20 EB
CrossesD 35 (elm St)
Coordinates42.43383, -93.20183

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length184.1 ft (56.1 m)
Max Span66.9 ft (20.4 m)
Deck Width42.7 ft (13 m)
Deck Area729.3 sq m
Main Spans3
Year Built2003

Traffic

Avg Daily Traffic4,900 (2022)
Truck Traffic28%
Lanes On Bridge2
Lanes Under Bridge2

Inspection & Ownership

Last InspectionAugust 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000607865

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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