US Bridges

I 380 NB Off Ramp over 3rd ST NW

Fair

Linn County, Iowa · 0.1 Mi. N of Jct. US 151 · Structure no. 000000000603920

Built
1979
46 years old
Condition
Fair
inspected December 2022
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
240 ft
3 main spans
Daily traffic
1,780
2022 count
Owner
State
State Highway Agency

About this bridge

I 380 NB Off Ramp over 3rd ST NW is a steel continuous stringer/multi-beam or girder carrying I 380 NB Off Ramp over 3rd ST NW 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 1,780 vehicles a day, roughly 3% of them trucks, projected to reach 1,780 by 2042. The structure is 240 ft (73.2 m) long and 23 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 380 NB Off Ramp
Crosses3rd ST NW
Location0.1 Mi. N of Jct. US 151
RouteInterstate 380
CountyLinn County
StateIowa
Coordinates41.9759, -91.67603
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.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2022
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 rating94.8 US tons
Inventory rating56.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length240 ft (73.2 m)
Longest span106 ft (32.3 m)
Deck width23 ft (7.1 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,780 (2022)
Projected traffic1,780 by 2042
Trucks3%
Lanes on structure1
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 NB Off Ramp over 3rd ST NW built?

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

What condition is I 380 NB Off Ramp over 3rd ST NW 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 December 2022.

How much traffic does I 380 NB Off Ramp over 3rd ST NW carry?

About 1,780 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is I 380 NB Off Ramp over 3rd ST NW?

The structure is 240 ft (73.2 m) long with a longest span of 106 ft (32.3 m) and a deck 23 ft wide.

Who owns I 380 NB Off Ramp over 3rd ST NW?

It is owned by the State Highway Agency.