US Bridges

620th ST over Willow Creek

Good

Cherokee County, Iowa · 090411801 · Structure no. 000000000107501

Built
2022
3 years old
Condition
Good
inspected August 2023
Type
Slab
Concrete Continuous
Length
101 ft
3 main spans
Daily traffic
15
2022 count
Owner
County
County Highway Agency

About this bridge

620th ST over Willow Creek is a concrete continuous slab carrying 620th ST over Willow Creek in Cherokee County, Iowa. It was built in 2022, so it is 3 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 15 vehicles a day, projected to reach 15 by 2043. The structure is 101 ft (30.8 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries620th ST
CrossesWillow Creek
Location090411801
RouteCounty Highway 0
CountyCherokee County
StateIowa
Coordinates42.61904, -95.7401
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation9: Superior to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating57.5 US tons
Inventory rating44.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length101 ft (30.8 m)
Longest span39 ft (11.9 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2022)
Projected traffic15 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$30,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 620th ST over Willow Creek built?

It was built in 2022, making it 3 years old in 2025.

What condition is 620th ST over Willow Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2023.

How much traffic does 620th ST over Willow Creek carry?

About 15 vehicles per day (2022 count).

How long is 620th ST over Willow Creek?

The structure is 101 ft (30.8 m) long with a longest span of 39 ft (11.9 m) and a deck 33 ft wide.

Who owns 620th ST over Willow Creek?

It is owned by the County Highway Agency.