US Bridges

NB I-380 over City Sts Ccp& UP RR

Fair

Linn County, Iowa · 0.6 Mi. N of Jct. Ia 922 · Structure no. 000000000603690

Built
1979
46 years old
Condition
Fair
inspected October 2022
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,479 ft
20 main spans
Daily traffic
31,850
2022 count
Owner
State
State Highway Agency

About this bridge

NB I-380 over City Sts Ccp& UP RR is a steel continuous stringer/multi-beam or girder carrying NB I-380 over City Sts Ccp& UP RR in Linn County, Iowa. It was built in 1979, so it is 46 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 31,850 vehicles a day, roughly 12% of them trucks, projected to reach 31,850 by 2042. The structure is 1,479 ft (450.8 m) long and 49 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesNB I-380
CrossesCity Sts Ccp& UP RR
Location0.6 Mi. N of Jct. Ia 922
RouteInterstate 380
CountyLinn County
StateIowa
Coordinates41.97925, -91.67159
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 inspectionOctober 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.7 US tons
Inventory rating25.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans20
Design loadHS 20
Structure length1,479 ft (450.8 m)
Longest span99 ft (30.2 m)
Deck width49 ft (15 m)
Roadway width46 ft (14 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic31,850 (2022)
Projected traffic31,850 by 2042
Trucks12%
Lanes on structure3
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
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 City Sts Ccp& UP RR built?

It was built in 1979, making it 46 years old in 2025.

What condition is NB I-380 over City Sts Ccp& UP RR 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 October 2022.

How much traffic does NB I-380 over City Sts Ccp& UP RR carry?

About 31,850 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is NB I-380 over City Sts Ccp& UP RR?

The structure is 1,479 ft (450.8 m) long with a longest span of 99 ft (30.2 m) and a deck 49 ft wide.

Who owns NB I-380 over City Sts Ccp& UP RR?

It is owned by the State Highway Agency.