Structure 700330 · Woodbury County, IA

I 29 SB over Pierce ST Frontage RD

Carries I 29 SB over Pierce ST Frontage RD, 0.4 Mi S. Of Jct. US 77.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure8/9 · Very Good
Substructure8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT192 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 8/9Substructure 8/9

192 ft end to end, longest span 71 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.

Built20188 years old
Length191.9 ft58.5 m
Daily traffic21,100counted 2022
Last inspectedDecember 2023every 24 months

Location

StateIowa
CountyWoodbury
Location0.4 Mi S. Of Jct. US 77
CarriesI 29 SB
CrossesPierce ST Frontage RD
Coordinates42.48924, -96.40523

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length191.9 ft (58.5 m)
Max Span70.9 ft (21.6 m)
Deck Width77.1 ft (23.5 m)
Deck Area1374.8 sq m
Main Spans3
Year Built2018

Traffic

Avg Daily Traffic21,100 (2022)
Truck Traffic16%
Lanes On Bridge4
Lanes Under Bridge1

Inspection & Ownership

Last InspectionDecember 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000700330

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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