Structure 27201 · Hardin County, IA

Ia 175 over So Fork Iowa River

Carries Ia 175 over So Fork Iowa River, 2.5 Mi. E Of E Jct. US 65.

Overall conditionGood

Set by its lowest-rated component: Deck and Substructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructure8/9 · Very Good
Substructuresets the rating7/9 · Good
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT256 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9 · sets the ratingSuperstructure 8/9Substructure 7/9 · sets the rating

256 ft end to end, longest span 96 ft: about 4 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.

Built198145 years old
Length255.9 ft78 m
Daily traffic1,770counted 2022
Last inspectedApril 2023every 24 months

Location

StateIowa
CountyHardin
Location2.5 Mi. E Of E Jct. US 65
CarriesIa 175
CrossesSo Fork Iowa River
Coordinates42.36075, -93.21359

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length255.9 ft (78 m)
Max Span96.1 ft (29.3 m)
Deck Width43.3 ft (13.2 m)
Deck Area1029.6 sq m
Main Spans3
Year Built1981

Traffic

Avg Daily Traffic1,770 (2022)
Truck Traffic16%
Lanes On Bridge2

Inspection & Ownership

Last InspectionApril 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number000000000027201

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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