US Bridges

WB US 20 over Big Whiskey Creek

Fair

Woodbury County, Iowa · 1.9 Mi. W of S.R. K42 · Structure no. 000000000052881

Built
2010
15 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
206 ft
3 main spans
Daily traffic
5,600
2022 count
Owner
State
State Highway Agency

About this bridge

WB US 20 over Big Whiskey Creek is a prestressed concrete stringer/multi-beam or girder carrying WB US 20 over Big Whiskey Creek in Woodbury County, Iowa. It was built in 2010, so it is 15 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 5,600 vehicles a day, roughly 14% of them trucks, projected to reach 5,600 by 2044. The structure is 206 ft (62.8 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesWB US 20
CrossesBig Whiskey Creek
Location1.9 Mi. W of S.R. K42
RouteU.S. Route 20
StateIowa
Coordinates42.47524, -96.25019
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.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.7 US tons
Inventory rating42.4 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length206 ft (62.8 m)
Longest span116 ft (35.5 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,600 (2022)
Projected traffic5,600 by 2044
Trucks14%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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 WB US 20 over Big Whiskey Creek built?

It was built in 2010, making it 15 years old in 2025.

What condition is WB US 20 over Big Whiskey Creek 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 November 2024.

How much traffic does WB US 20 over Big Whiskey Creek carry?

About 5,600 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is WB US 20 over Big Whiskey Creek?

The structure is 206 ft (62.8 m) long with a longest span of 116 ft (35.5 m) and a deck 43 ft wide.

Who owns WB US 20 over Big Whiskey Creek?

It is owned by the State Highway Agency.