Structure 607090 · Linn County, IA

I 380 SB over Cic Rr & 8th AVE

Carries I 380 SB over Cic Rr & 8th AVE, 0.8 Mi. S Of Jct. Ia #922.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT638 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

638 ft end to end, longest span 85 ft: about 1.8 football fields. 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.

Built197551 years old
Length638.1 ft194.5 m
Daily traffic26,000counted 2022
Last inspectedJune 2023every 24 months

Location

StateIowa
CountyLinn
Location0.8 Mi. S Of Jct. Ia #922
CarriesI 380 SB
CrossesCic Rr & 8th AVE
Coordinates41.96896, -91.67230

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length638.1 ft (194.5 m)
Max Span85.0 ft (25.9 m)
Deck Width65.9 ft (20.1 m)
Deck Area3909.4 sq m
Main Spans10
Year Built1975

Traffic

Avg Daily Traffic26,000 (2022)
Truck Traffic14%
Lanes On Bridge4
Lanes Under Bridge2

Inspection & Ownership

Last InspectionJune 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000607090

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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