US Bridges

I 380 SB over Ianr RR Tx ST Cedar Rvr

Fair

Black Hawk County, Iowa · 0.4 Mi. S of U.S. 20 · Structure no. 000000000605350

Built
1983
42 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
887 ft
9 main spans
Daily traffic
10,700
2021 count
Owner
State
State Highway Agency

About this bridge

I 380 SB over Ianr RR Tx ST Cedar Rvr is a steel continuous stringer/multi-beam or girder carrying I 380 SB over Ianr RR Tx ST Cedar Rvr in Black Hawk County, Iowa. It was built in 1983, so it is 42 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 10,700 vehicles a day, roughly 15% of them trucks, projected to reach 10,700 by 2043. The structure is 887 ft (270.4 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 380 SB
CrossesIanr RR Tx ST Cedar Rvr
Location0.4 Mi. S of U.S. 20
RouteInterstate 380
CountyBlack Hawk County
StateIowa
Coordinates42.45469, -92.30779
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.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating55.3 US tons
Inventory rating33.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans9
Design loadHS 20
Structure length887 ft (270.4 m)
Longest span116 ft (35.4 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,700 (2021)
Projected traffic10,700 by 2043
Trucks15%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway, waterway 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I 380 SB over Ianr RR Tx ST Cedar Rvr built?

It was built in 1983, making it 42 years old in 2025.

What condition is I 380 SB over Ianr RR Tx ST Cedar Rvr 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 May 2023.

How much traffic does I 380 SB over Ianr RR Tx ST Cedar Rvr carry?

About 10,700 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is I 380 SB over Ianr RR Tx ST Cedar Rvr?

The structure is 887 ft (270.4 m) long with a longest span of 116 ft (35.4 m) and a deck 43 ft wide.

Who owns I 380 SB over Ianr RR Tx ST Cedar Rvr?

It is owned by the State Highway Agency.