US Bridges

US 20 Ramp over Aband RR

Fair

Woodbury County, Iowa · 0.1 Mi. E of SR D25 · Structure no. 000000000603790

Built
1978
47 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
179 ft
3 main spans
Daily traffic
1,200
2022 count
Owner
State
State Highway Agency

About this bridge

US 20 Ramp over Aband RR is a prestressed concrete stringer/multi-beam or girder carrying US 20 Ramp over Aband RR in Woodbury County, Iowa. It was built in 1978, so it is 47 years old, older 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 1,200 vehicles a day, roughly 2% of them trucks, projected to reach 1,200 by 2043. The structure is 179 ft (54.6 m) long and 29 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 20 Ramp
CrossesAband RR
Location0.1 Mi. E of SR D25
RouteU.S. Route 20
CountyWoodbury County
StateIowa
Coordinates42.46203, -96.326
Functional classUrban Other Principal Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating71.4 US tons
Inventory rating40.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length179 ft (54.6 m)
Longest span68 ft (20.7 m)
Deck width29 ft (8.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,200 (2022)
Projected traffic1,200 by 2043
Trucks2%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesOther
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 Ramp over Aband RR built?

It was built in 1978, making it 47 years old in 2025.

What condition is US 20 Ramp over Aband RR 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 October 2023.

How much traffic does US 20 Ramp over Aband RR carry?

About 1,200 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is US 20 Ramp over Aband RR?

The structure is 179 ft (54.6 m) long with a longest span of 68 ft (20.7 m) and a deck 29 ft wide.

Who owns US 20 Ramp over Aband RR?

It is owned by the State Highway Agency.