US Bridges

LOCAL-520th ST over Maple River

Good

Cherokee County, Iowa · 092392801 · Structure no. 000000000108861

Built
2012
13 years old
Condition
Good
inspected August 2023
Type
Slab
Concrete Continuous
Length
73 ft
3 main spans
Daily traffic
26
2022 count
Owner
County
County Highway Agency

About this bridge

LOCAL-520th ST over Maple River is a concrete continuous slab carrying LOCAL-520th ST over Maple River in Cherokee County, Iowa. It was built in 2012, so it is 13 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 26 vehicles a day, projected to reach 26 by 2043. The structure is 73 ft (22.3 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesLOCAL-520th ST
CrossesMaple River
Location092392801
RouteCounty Highway 0
CountyCherokee County
StateIowa
Coordinates42.76314, -95.45164
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
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 evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.1 US tons
Inventory rating44 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length73 ft (22.3 m)
Longest span28 ft (8.5 m)
Deck width27 ft (8.3 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26 (2022)
Projected traffic26 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 Maple River built?

It was built in 2012, making it 13 years old in 2025.

What condition is LOCAL-520th ST over Maple River 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 Maple River carry?

About 26 vehicles per day (2022 count).

How long is LOCAL-520th ST over Maple River?

The structure is 73 ft (22.3 m) long with a longest span of 28 ft (8.5 m) and a deck 27 ft wide.

Who owns LOCAL-520th ST over Maple River?

It is owned by the County Highway Agency.