US Bridges

NB I-380 over H Ave NE

Fair

Linn County, Iowa · 2.3 Mi. S of Jct. 100 · Structure no. 000000000604250

Built
1980
45 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
171 ft
3 main spans
Daily traffic
38,800
2022 count
Owner
State
State Highway Agency

About this bridge

NB I-380 over H Ave NE is a prestressed concrete stringer/multi-beam or girder carrying NB I-380 over H Ave NE in Linn County, Iowa. It was built in 1980, so it is 45 years old, younger 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 38,800 vehicles a day, roughly 11% of them trucks, projected to reach 38,800 by 2043. The structure is 171 ft (52.1 m) long and 59 ft wide.

Location

Open in Google Maps
CarriesNB I-380
CrossesH Ave NE
Location2.3 Mi. S of Jct. 100
RouteInterstate 380
CountyLinn County
StateIowa
Coordinates41.99548, -91.66642
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating83.3 US tons
Inventory rating44.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length171 ft (52.1 m)
Longest span77 ft (23.5 m)
Deck width59 ft (18 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic38,800 (2022)
Projected traffic38,800 by 2043
Trucks11%
Lanes on structure3
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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 H Ave NE built?

It was built in 1980, making it 45 years old in 2025.

What condition is NB I-380 over H Ave NE 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 February 2023.

How much traffic does NB I-380 over H Ave NE carry?

About 38,800 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is NB I-380 over H Ave NE?

The structure is 171 ft (52.1 m) long with a longest span of 77 ft (23.5 m) and a deck 59 ft wide.

Who owns NB I-380 over H Ave NE?

It is owned by the State Highway Agency.