US Bridges

US 20 Ramps Df over Ramp over Ia 376 & UP RR

Fair

Woodbury County, Iowa · 3.8 Mi. W of Ia 12 · Structure no. 000000000600762

Built
1976
49 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
344 ft
4 main spans
Daily traffic
6,800
2022 count
Owner
State
State Highway Agency

About this bridge

US 20 Ramps Df over Ramp over Ia 376 & UP RR is a steel continuous stringer/multi-beam or girder carrying US 20 Ramps Df over Ramp over Ia 376 & UP RR in Woodbury County, Iowa. It was built in 1976, so it is 49 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 6,800 vehicles a day, roughly 9% of them trucks, projected to reach 6,800 by 2043. The structure is 344 ft (104.9 m) long and 41 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesUS 20 Ramps Df
CrossesRamp over Ia 376 & UP RR
Location3.8 Mi. W of Ia 12
RouteInterstate 29
CountyWoodbury County
StateIowa
Coordinates42.44459, -96.37193
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating84.1 US tons
Inventory rating50.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length344 ft (104.9 m)
Longest span103 ft (31.4 m)
Deck width41 ft (12.6 m)
Roadway width38 ft (11.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,800 (2022)
Projected traffic6,800 by 2043
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway and railroad
Detour if closed9.9 mi (16 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 Ramps Df over Ramp over Ia 376 & UP RR built?

It was built in 1976, making it 49 years old in 2025.

What condition is US 20 Ramps Df over Ramp over Ia 376 & UP 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 August 2023.

How much traffic does US 20 Ramps Df over Ramp over Ia 376 & UP RR carry?

About 6,800 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is US 20 Ramps Df over Ramp over Ia 376 & UP RR?

The structure is 344 ft (104.9 m) long with a longest span of 103 ft (31.4 m) and a deck 41 ft wide.

Who owns US 20 Ramps Df over Ramp over Ia 376 & UP RR?

It is owned by the State Highway Agency.