US 20 over West Cedar Creek

Fair

Calhoun County, Iowa · 088313101 · Structure no. 000000000016860

Built: 1961; 64 years old
Condition: Fair; inspected July 2024
Type: Slab; Concrete Continuous
Length: 72 ft; 3 main spans
Daily traffic: 769; 2022 count
Owner: County; County Highway Agency

About this bridge

US 20 over West Cedar Creek is a concrete continuous slab carrying US 20 over West Cedar Creek in Calhoun County, Iowa. It was built in 1961, so it is 64 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 769 vehicles a day, roughly 23% of them trucks, projected to reach 769 by 2044. The structure is 72 ft (21.9 m) long and 36 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesUS 20

CrossesWest Cedar Creek

Location088313101

RouteCounty Highway 0

CountyCalhoun County

StateIowa

Coordinates42.39854, -94.50883

Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

Component	Rating	Meaning
Deck	6 Satisfactory	Structural elements show some minor deterioration.
Superstructure	6 Satisfactory	Structural elements show some minor deterioration.
Substructure	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection	6 Satisfactory	Structural elements show some minor deterioration.

Last inspectionJuly 2024

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 geometry6: Equal to present minimum criteria

Waterway adequacy7: Better than present minimum criteria

Approach roadway alignment7: Better than present minimum criteria

Operating rating47.7 US tons

Inventory rating28.5 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadH 20

Structure length72 ft (21.9 m)

Longest span27 ft (8.2 m)

Deck width36 ft (11 m)

Roadway width30 ft (9.2 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic769 (2022)

Projected traffic769 by 2044

Trucks23%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed9.9 mi (16 km)

TollOn a free road

National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency

Maintained byCounty Highway Agency

Historic statusNot eligible for the National Register of Historic Places

Work proposedReplacement because of substandard load-carrying capacity or roadway geometry

Estimated improvement cost—

NavigationNo navigation control on waterway

Frequently asked questions

When was US 20 over West Cedar Creek built?

It was built in 1961, making it 64 years old in 2025.

What condition is US 20 over West Cedar 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 July 2024.

How much traffic does US 20 over West Cedar Creek carry?

About 769 vehicles per day (2022 count), of which roughly 23% are trucks.

How long is US 20 over West Cedar Creek?

The structure is 72 ft (21.9 m) long with a longest span of 27 ft (8.2 m) and a deck 36 ft wide.

Who owns US 20 over West Cedar Creek?

It is owned by the County Highway Agency.