US Bridges

LOCAL-490th St. over Maple River

Fair

Cherokee County, Iowa · 092390901 · Structure no. 000000000108711

Built
1975
50 years old
Condition
Fair
inspected August 2023
Type
Slab
Concrete Continuous
Length
77 ft
3 main spans
Daily traffic
15
2022 count
Owner
County
County Highway Agency

About this bridge

LOCAL-490th St. over Maple River is a concrete continuous slab carrying LOCAL-490th St. over Maple River in Cherokee County, Iowa. It was built in 1975, so it is 50 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 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 15 vehicles a day, projected to reach 15 by 2043. The structure is 77 ft (23.5 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesLOCAL-490th St.
CrossesMaple River
Location092390901
RouteCounty Highway 0
CountyCherokee County
StateIowa
Coordinates42.8066, -95.44753
Functional classRural Local

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.1 US tons
Inventory rating24.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length77 ft (23.5 m)
Longest span29 ft (8.8 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 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 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-490th St. over Maple River built?

It was built in 1975, making it 50 years old in 2025.

What condition is LOCAL-490th St. over Maple River 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 August 2023.

How much traffic does LOCAL-490th St. over Maple River carry?

About 15 vehicles per day (2022 count).

How long is LOCAL-490th St. over Maple River?

The structure is 77 ft (23.5 m) long with a longest span of 29 ft (8.8 m) and a deck 26 ft wide.

Who owns LOCAL-490th St. over Maple River?

It is owned by the County Highway Agency.