US Bridges

I380 SB Flyover over US 20 & US 218

Fair

Black Hawk County, Iowa · At N Jct. 20 · Structure no. 000000000605290

Built
1983
42 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,498 ft
10 main spans
Daily traffic
9,700
2022 count
Owner
State
State Highway Agency

About this bridge

I380 SB Flyover over US 20 & US 218 is a steel continuous stringer/multi-beam or girder carrying I380 SB Flyover over US 20 & US 218 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 9,700 vehicles a day, roughly 14% of them trucks, projected to reach 9,700 by 2043. The structure is 1,498 ft (456.6 m) long and 43 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesI380 SB Flyover
CrossesUS 20 & US 218
LocationAt N Jct. 20
RouteInterstate 380
CountyBlack Hawk County
StateIowa
Coordinates42.45567, -92.31422
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating75.2 US tons
Inventory rating38.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans10
Design loadHS 20
Structure length1,498 ft (456.6 m)
Longest span195 ft (59.4 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,700 (2022)
Projected traffic9,700 by 2043
Trucks14%
Lanes on structure2
Traffic directionOne-way traffic
CarriesThird level (interchange)
CrossesHighway
Detour if closed3.7 mi (6 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 I380 SB Flyover over US 20 & US 218 built?

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

What condition is I380 SB Flyover over US 20 & US 218 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 2023.

How much traffic does I380 SB Flyover over US 20 & US 218 carry?

About 9,700 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is I380 SB Flyover over US 20 & US 218?

The structure is 1,498 ft (456.6 m) long with a longest span of 195 ft (59.4 m) and a deck 43 ft wide.

Who owns I380 SB Flyover over US 20 & US 218?

It is owned by the State Highway Agency.