US Bridges

WB US 20 over Little Whiskey Creek

Fair

Woodbury County, Iowa · 3.4 Mi. W of SR K42 · Structure no. 000000000052860

Built
1953
72 years old
Condition
Fair
inspected December 2022
Type
Slab
Concrete Continuous
Length
122 ft
3 main spans
Daily traffic
6,500
2022 count
Owner
State
State Highway Agency

About this bridge

WB US 20 over Little Whiskey Creek is a concrete continuous slab carrying WB US 20 over Little Whiskey Creek in Woodbury County, Iowa. It was built in 1953, so it is 72 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 6,500 vehicles a day, roughly 12% of them trucks, projected to reach 6,500 by 2042. The structure is 122 ft (37.2 m) long and 35 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesWB US 20
CrossesLittle Whiskey Creek
Location3.4 Mi. W of SR K42
RouteU.S. Route 20
StateIowa
Coordinates42.47537, -96.28092
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length122 ft (37.2 m)
Longest span46 ft (14 m)
Deck width35 ft (10.6 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,500 (2022)
Projected traffic6,500 by 2042
Trucks12%
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was WB US 20 over Little Whiskey Creek built?

It was built in 1953, making it 72 years old in 2025.

What condition is WB US 20 over Little 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 December 2022.

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

About 6,500 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is WB US 20 over Little Whiskey Creek?

The structure is 122 ft (37.2 m) long with a longest span of 46 ft (14 m) and a deck 35 ft wide.

Who owns WB US 20 over Little Whiskey Creek?

It is owned by the State Highway Agency.