US Bridges

NB I-380 over Cic RR & City ST

Fair

Linn County, Iowa · 0.7 Mi. N of Jct. US 30 · Structure no. 000000000600565

Built
1975
50 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
567 ft
8 main spans
Daily traffic
31,400
2022 count
Owner
State
State Highway Agency

About this bridge

NB I-380 over Cic RR & City ST is a prestressed concrete stringer/multi-beam or girder carrying NB I-380 over Cic RR & City ST in Linn County, Iowa. It was built in 1975, so it is 50 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 31,400 vehicles a day, roughly 13% of them trucks, projected to reach 31,400 by 2044. The structure is 567 ft (172.8 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 & City ST
Location0.7 Mi. N of Jct. US 30
RouteInterstate 380
CountyLinn County
StateIowa
Coordinates41.93576, -91.66882
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating71.5 US tons
Inventory rating34.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans8
Design loadHS 20
Structure length567 ft (172.8 m)
Longest span73 ft (22.3 m)
Deck width55 ft (16.9 m)
Roadway width52 ft (15.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic31,400 (2022)
Projected traffic31,400 by 2044
Trucks13%
Lanes on structure3
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway, waterway 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 & City ST built?

It was built in 1975, making it 50 years old in 2025.

What condition is NB I-380 over Cic RR & City ST 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 November 2024.

How much traffic does NB I-380 over Cic RR & City ST carry?

About 31,400 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is NB I-380 over Cic RR & City ST?

The structure is 567 ft (172.8 m) long with a longest span of 73 ft (22.3 m) and a deck 55 ft wide.

Who owns NB I-380 over Cic RR & City ST?

It is owned by the State Highway Agency.