US Bridges

N 20th St(prop) over Willow Creek

Fair

Cerro Gordo County, Iowa · 096210700 · Structure no. 000000000504270

Built
1994
31 years old
Condition
Fair
inspected March 2022
Type
Slab
Concrete Continuous
Length
172 ft
3 main spans
Daily traffic
829
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

N 20th St(prop) over Willow Creek is a concrete continuous slab carrying N 20th St(prop) over Willow Creek in Cerro Gordo County, Iowa. It was built in 1994, so it is 31 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 829 vehicles a day, projected to reach 829 by 2043. The structure is 172 ft (52.4 m) long and 39 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesN 20th St(prop)
CrossesWillow Creek
Location096210700
RouteCity Street 0
CountyCerro Gordo County
StateIowa
Coordinates43.14701, -93.36454
Functional classUrban Collector

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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.6 US tons
Inventory rating39.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length172 ft (52.4 m)
Longest span66 ft (20.1 m)
Deck width39 ft (11.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic829 (2022)
Projected traffic829 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was N 20th St(prop) over Willow Creek built?

It was built in 1994, making it 31 years old in 2025.

What condition is N 20th St(prop) over Willow 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 March 2022.

How much traffic does N 20th St(prop) over Willow Creek carry?

About 829 vehicles per day (2022 count).

How long is N 20th St(prop) over Willow Creek?

The structure is 172 ft (52.4 m) long with a longest span of 66 ft (20.1 m) and a deck 39 ft wide.

Who owns N 20th St(prop) over Willow Creek?

It is owned by the City or Municipal Highway Agency.