US Bridges

I480/20th ST Exit over CHICAGO/DAVENPORT/20th

Fair

Douglas County, Nebraska · In Omaha · Structure no. S480 00310A

Built
1970
55 years old, rebuilt 2021
Condition
Fair
inspected August 2024
Type
Box Beam or Girders - Single or Spread
Steel Continuous
Length
621 ft
10 main spans
Daily traffic
42,920
2018 count
Owner
State
State Highway Agency

About this bridge

I480/20th ST Exit over CHICAGO/DAVENPORT/20th is a steel continuous box beam or girders - single or spread carrying I480/20th ST Exit over CHICAGO/DAVENPORT/20th in Douglas County, Nebraska. It was built in 1970 and reconstructed in 2021, so it is 55 years old, older than the Nebraska average of 47.1 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 42,920 vehicles a day, roughly 4% of them trucks, projected to reach 42,920 by 2038. The structure is 621 ft (189.3 m) long and 34 ft wide. If it were closed, the detour would be 12.4 mi (20 km).

Location

Open in Google Maps
CarriesI480/20th ST Exit
CrossesCHICAGO/DAVENPORT/20th
LocationIn Omaha
RouteInterstate 480
CountyDouglas County
StateNebraska
Coordinates41.2624, -95.942
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
Deck8 Very GoodNo problems noted.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating87.1 US tons
Inventory rating50.7 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans10
Design loadUnknown
Structure length621 ft (189.3 m)
Longest span72 ft (21.9 m)
Deck width34 ft (10.4 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic42,920 (2018)
Projected traffic42,920 by 2038
Trucks4%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed12.4 mi (20 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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I480/20th ST Exit over CHICAGO/DAVENPORT/20th built?

It was built in 1970, making it 55 years old in 2025. It was reconstructed in 2021.

What condition is I480/20th ST Exit over CHICAGO/DAVENPORT/20th 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 August 2024.

How much traffic does I480/20th ST Exit over CHICAGO/DAVENPORT/20th carry?

About 42,920 vehicles per day (2018 count), of which roughly 4% are trucks.

How long is I480/20th ST Exit over CHICAGO/DAVENPORT/20th?

The structure is 621 ft (189.3 m) long with a longest span of 72 ft (21.9 m) and a deck 34 ft wide.

Who owns I480/20th ST Exit over CHICAGO/DAVENPORT/20th?

It is owned by the State Highway Agency.