US Bridges

NB I-380 over Cic RR & 8th Ave

Fair

Linn County, Iowa · 0.8 Mi. S of Jct. Ia #922 · Structure no. 000000000607080

Built
1973
52 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
638 ft
10 main spans
Daily traffic
30,200
2022 count
Owner
State
State Highway Agency

About this bridge

NB I-380 over Cic RR & 8th Ave is a steel continuous stringer/multi-beam or girder carrying NB I-380 over Cic RR & 8th Ave in Linn County, Iowa. It was built in 1973, so it is 52 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 30,200 vehicles a day, roughly 13% of them trucks, projected to reach 30,200 by 2042. The structure is 638 ft (194.5 m) long and 55 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesNB I-380
CrossesCic RR & 8th Ave
Location0.8 Mi. S of Jct. Ia #922
RouteInterstate 380
CountyLinn County
StateIowa
Coordinates41.96748, -91.67101
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating60.4 US tons
Inventory rating36.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans10
Design loadHS 20
Structure length638 ft (194.5 m)
Longest span86 ft (26.2 m)
Deck width55 ft (16.7 m)
Roadway width52 ft (15.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30,200 (2022)
Projected traffic30,200 by 2042
Trucks13%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was NB I-380 over Cic RR & 8th Ave built?

It was built in 1973, making it 52 years old in 2025.

What condition is NB I-380 over Cic RR & 8th Ave in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2024.

How much traffic does NB I-380 over Cic RR & 8th Ave carry?

About 30,200 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is NB I-380 over Cic RR & 8th Ave?

The structure is 638 ft (194.5 m) long with a longest span of 86 ft (26.2 m) and a deck 55 ft wide.

Who owns NB I-380 over Cic RR & 8th Ave?

It is owned by the State Highway Agency.