US Bridges

US 20 over Ia 376 & UP RR

Fair

Woodbury County, Iowa · At JCT of Ia. 376 · Structure no. 000000000600760

Built
1976
49 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
353 ft
4 main spans
Daily traffic
10,000
2022 count
Owner
State
State Highway Agency

About this bridge

US 20 over Ia 376 & UP RR is a steel continuous stringer/multi-beam or girder carrying US 20 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 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 10,000 vehicles a day, roughly 14% of them trucks, projected to reach 10,000 by 2043. The structure is 353 ft (107.6 m) long and 86 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesUS 20
CrossesIa 376 & UP RR
LocationAt JCT of Ia. 376
RouteU.S. Route 20
CountyWoodbury County
StateIowa
Coordinates42.44587, -96.37218
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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79.3 US tons
Inventory rating47.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length353 ft (107.6 m)
Longest span106 ft (32.3 m)
Deck width86 ft (26.1 m)
Roadway width79 ft (24.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,000 (2022)
Projected traffic10,000 by 2043
Trucks14%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway and railroad
Detour if closed5 mi (8 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$1,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 20 over Ia 376 & UP RR built?

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

What condition is US 20 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 over Ia 376 & UP RR carry?

About 10,000 vehicles per day (2022 count), of which roughly 14% are trucks.

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

The structure is 353 ft (107.6 m) long with a longest span of 106 ft (32.3 m) and a deck 86 ft wide.

Who owns US 20 over Ia 376 & UP RR?

It is owned by the State Highway Agency.