Structure 26521 · Hamilton County, IA

Ia 175 over Drainage Ditch

Carries Ia 175 over Drainage Ditch, 0.2 Mi. E Of E Jct. US 69.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructuresets the rating6/9 · Satisfactory
Substructure7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT103 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 6/9 · sets the ratingSubstructure 7/9

103 ft end to end, longest span 39 ft. 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 slab bridge.

Built197749 years old
Length103.0 ft31.4 m
Daily traffic2,100counted 2022
Last inspectedMarch 2023every 24 months

Location

StateIowa
CountyHamilton
Location0.2 Mi. E Of E Jct. US 69
CarriesIa 175
CrossesDrainage Ditch
Coordinates42.30690, -93.63679

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length103.0 ft (31.4 m)
Max Span39.0 ft (11.9 m)
Deck Width41.3 ft (12.6 m)
Deck Area395.6 sq m
Main Spans3
Year Built1977

Traffic

Avg Daily Traffic2,100 (2022)
Truck Traffic16%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMarch 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number000000000026521

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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