US Bridges

SB Rp I-380 &20 over I-380 & 20

Fair

Black Hawk County, Iowa · At East Jct. I-380 · Structure no. 000000000604940

Built
1980
45 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
423 ft
4 main spans
Daily traffic
80
2022 count
Owner
State
State Highway Agency

About this bridge

SB Rp I-380 &20 over I-380 & 20 is a steel continuous stringer/multi-beam or girder carrying SB Rp I-380 &20 over I-380 & 20 in Black Hawk 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 80 vehicles a day, roughly 30% of them trucks, projected to reach 80 by 2042. The structure is 423 ft (128.9 m) long and 29 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

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CarriesSB Rp I-380 &20
CrossesI-380 & 20
LocationAt East Jct. I-380
RouteInterstate 380
CountyBlack Hawk County
StateIowa
Coordinates42.44989, -92.19089
Functional classRural 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating71.5 US tons
Inventory rating42.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length423 ft (128.9 m)
Longest span115 ft (35.1 m)
Deck width29 ft (8.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic80 (2022)
Projected traffic80 by 2042
Trucks30%
Lanes on structure1
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed11.2 mi (18 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 SB Rp I-380 &20 over I-380 & 20 built?

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

What condition is SB Rp I-380 &20 over I-380 & 20 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 April 2023.

How much traffic does SB Rp I-380 &20 over I-380 & 20 carry?

About 80 vehicles per day (2022 count), of which roughly 30% are trucks.

How long is SB Rp I-380 &20 over I-380 & 20?

The structure is 423 ft (128.9 m) long with a longest span of 115 ft (35.1 m) and a deck 29 ft wide.

Who owns SB Rp I-380 &20 over I-380 & 20?

It is owned by the State Highway Agency.