Structure 607325 · Grundy County, IA

T47 (q Ave) over US 20

Carries T47 (q Ave) over US 20, 3.0 Miles E Of Jct Ia 14.

Overall conditionGood

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

How ratings work
Deck8/9 · Very Good
Superstructure8/9 · Very Good
Substructuresets the rating7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT235 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 8/9Substructure 7/9 · sets the rating

235 ft end to end, longest span 116 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.

Built199927 years old
Length234.9 ft71.6 m
Daily traffic69counted 2022
Last inspectedJuly 2024every 24 months

Location

StateIowa
CountyGrundy
Location3.0 Miles E Of Jct Ia 14
CarriesT47 (q Ave)
CrossesUS 20
Coordinates42.46306, -92.71049

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length234.9 ft (71.6 m)
Max Span116.1 ft (35.4 m)
Deck Width33.1 ft (10.1 m)
Deck Area723.2 sq m
Main Spans2
Year Built1999

Traffic

Avg Daily Traffic69 (2022)
Truck Traffic20%
Lanes On Bridge2
Lanes Under Bridge4

Inspection & Ownership

Last InspectionJuly 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000607325

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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