Structure 49130 · Story County, IA

SB I-35 over Bike Path

Carries SB I-35 over Bike Path, 1.1 Mi. N Of Jct. Ia 210.

Overall conditionFair

Set by its lowest-rated component: Deck and Substructure at 5 of 9.

How ratings work
Decksets the rating5/9 · Fair
Superstructure7/9 · Good
Substructuresets the rating5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT145 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 7/9Substructure 5/9 · sets the rating

145 ft end to end, longest span 48 ft: about 2 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.

Built196462 years old
Length145.0 ft44.2 m
Daily traffic23,300counted 2022
Last inspectedOctober 2023every 24 months

Location

StateIowa
CountyStory
Location1.1 Mi. N Of Jct. Ia 210
CarriesSB I-35
CrossesBike Path
Coordinates41.89374, -93.57122

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length145.0 ft (44.2 m)
Max Span47.9 ft (14.6 m)
Deck Width45.9 ft (14 m)
Deck Area618.8 sq m
Main Spans3
Year Built1964

Traffic

Avg Daily Traffic23,300 (2022)
Truck Traffic19%
Lanes On Bridge2

Inspection & Ownership

Last InspectionOctober 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000049130

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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