US Bridges

I 380 SB Off Ramp over City ST R.O.W

Fair

Linn County, Iowa · 0.2 Mi. N of Jct. 151 · Structure no. 000000000603930

Built
1979
46 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
313 ft
4 main spans
Daily traffic
7,400
2022 count
Owner
State
State Highway Agency

About this bridge

I 380 SB Off Ramp over City ST R.O.W is a steel continuous stringer/multi-beam or girder carrying I 380 SB Off Ramp over City ST R.O.W 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 7,400 vehicles a day, roughly 5% of them trucks, projected to reach 7,400 by 2044. The structure is 313 ft (95.4 m) long and 33 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 380 SB Off Ramp
CrossesCity ST R.O.W
Location0.2 Mi. N of Jct. 151
RouteInterstate 380
CountyLinn County
StateIowa
Coordinates41.97715, -91.67617
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating58.3 US tons
Inventory rating34.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length313 ft (95.4 m)
Longest span88 ft (26.8 m)
Deck width33 ft (10.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,400 (2022)
Projected traffic7,400 by 2044
Trucks5%
Lanes on structure2
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 SB Off Ramp over City ST R.O.W built?

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

What condition is I 380 SB Off Ramp over City ST R.O.W 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 June 2024.

How much traffic does I 380 SB Off Ramp over City ST R.O.W carry?

About 7,400 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is I 380 SB Off Ramp over City ST R.O.W?

The structure is 313 ft (95.4 m) long with a longest span of 88 ft (26.8 m) and a deck 33 ft wide.

Who owns I 380 SB Off Ramp over City ST R.O.W?

It is owned by the State Highway Agency.