US Bridges

LOCAL-520th St. over W Fork Little Sioux

Good

Cherokee County, Iowa · 092422601 · Structure no. 000000000109351

Built
2010
15 years old
Condition
Good
inspected August 2023
Type
Channel Beam
Concrete
Length
46 ft
1 main span
Daily traffic
15
2022 count
Owner
County
County Highway Agency

About this bridge

LOCAL-520th St. over W Fork Little Sioux is a concrete channel beam carrying LOCAL-520th St. over W Fork Little Sioux in Cherokee 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 good condition with a lowest component rating of 7 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 46 ft (14 m) long and 29 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesLOCAL-520th St.
CrossesW Fork Little Sioux
Location092422601
RouteCounty Highway 0
CountyCherokee County
StateIowa
Coordinates42.76425, -95.76629
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.7 US tons
Inventory rating37 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length46 ft (14 m)
Longest span44 ft (13.4 m)
Deck width29 ft (8.7 m)
Roadway width28 ft (8.6 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 closed1.9 mi (3 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 LOCAL-520th St. over W Fork Little Sioux built?

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

What condition is LOCAL-520th St. over W Fork Little Sioux 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 LOCAL-520th St. over W Fork Little Sioux carry?

About 15 vehicles per day (2022 count).

How long is LOCAL-520th St. over W Fork Little Sioux?

The structure is 46 ft (14 m) long with a longest span of 44 ft (13.4 m) and a deck 29 ft wide.

Who owns LOCAL-520th St. over W Fork Little Sioux?

It is owned by the County Highway Agency.