US Bridges

US 20 EB over Nb/Wb Ramp I-380

Fair

Black Hawk County, Iowa · At E Jct. I-380 · Structure no. 000000000604935

Built
1980
45 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
278 ft
3 main spans
Daily traffic
5,850
2022 count
Owner
State
State Highway Agency

About this bridge

US 20 EB over Nb/Wb Ramp I-380 is a steel continuous stringer/multi-beam or girder carrying US 20 EB over Nb/Wb Ramp I-380 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 5,850 vehicles a day, roughly 16% of them trucks, projected to reach 5,850 by 2042. The structure is 278 ft (84.7 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 20 EB
CrossesNb/Wb Ramp I-380
LocationAt E Jct. I-380
RouteU.S. Route 20
CountyBlack Hawk County
StateIowa
Coordinates42.44932, -92.19209
Functional classRural Principal Arterial - Other

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.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55 US tons
Inventory rating33 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length278 ft (84.7 m)
Longest span130 ft (39.6 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deck17 ft (5.1 m)

Traffic and service

Average daily traffic5,850 (2022)
Projected traffic5,850 by 2042
Trucks16%
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 US 20 EB over Nb/Wb Ramp I-380 built?

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

What condition is US 20 EB over Nb/Wb Ramp I-380 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 July 2023.

How much traffic does US 20 EB over Nb/Wb Ramp I-380 carry?

About 5,850 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is US 20 EB over Nb/Wb Ramp I-380?

The structure is 278 ft (84.7 m) long with a longest span of 130 ft (39.6 m) and a deck 43 ft wide.

Who owns US 20 EB over Nb/Wb Ramp I-380?

It is owned by the State Highway Agency.