US Bridges

I 380 SB over Ia 922

Fair

Linn County, Iowa · At Jct. Bus. U.S. 151 · Structure no. 000000000603688

Built
1979
46 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
2,296 ft
26 main spans
Daily traffic
28,800
2022 count
Owner
State
State Highway Agency

About this bridge

I 380 SB over Ia 922 is a steel continuous stringer/multi-beam or girder carrying I 380 SB over Ia 922 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 5 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 28,800 vehicles a day, roughly 13% of them trucks, projected to reach 28,800 by 2044. The structure is 2,296 ft (699.8 m) long and 55 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 380 SB
CrossesIa 922
LocationAt Jct. Bus. U.S. 151
RouteInterstate 380
CountyLinn County
StateIowa
Coordinates41.97849, -91.67408
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 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 alignment7: Better than present minimum criteria
Operating rating48.5 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans26
Design loadHS 20
Structure length2,296 ft (699.8 m)
Longest span95 ft (29 m)
Deck width55 ft (16.9 m)
Roadway width52 ft (15.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28,800 (2022)
Projected traffic28,800 by 2044
Trucks13%
Lanes on structure3
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
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 I 380 SB over Ia 922 built?

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

What condition is I 380 SB over Ia 922 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 July 2024.

How much traffic does I 380 SB over Ia 922 carry?

About 28,800 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is I 380 SB over Ia 922?

The structure is 2,296 ft (699.8 m) long with a longest span of 95 ft (29 m) and a deck 55 ft wide.

Who owns I 380 SB over Ia 922?

It is owned by the State Highway Agency.