US Bridges

FM-530th ST over W Fork Little Sioux

Poor

Cherokee County, Iowa · 092423501 · Structure no. 000000000109400

Built
1968
57 years old
Condition
Poor
inspected August 2023
Type
Culvert
Concrete Continuous
Length
50 ft
3 main spans
Daily traffic
898
2022 count
Owner
County
County Highway Agency

About this bridge

FM-530th ST over W Fork Little Sioux is a concrete continuous culvert carrying FM-530th ST over W Fork Little Sioux in Cherokee County, Iowa. It was built in 1968, so it is 57 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 898 vehicles a day, roughly 14% of them trucks, projected to reach 898 by 2043. The structure is 50 ft (15.2 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesFM-530th ST
CrossesW Fork Little Sioux
Location092423501
RouteCounty Highway 0
CountyCherokee County
StateIowa
Coordinates42.74966, -95.77952
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.3 US tons
Inventory rating33.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length50 ft (15.2 m)
Longest span18 ft (5.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic898 (2022)
Projected traffic898 by 2043
Trucks14%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$723,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FM-530th ST over W Fork Little Sioux built?

It was built in 1968, making it 57 years old in 2025.

What condition is FM-530th ST over W Fork Little Sioux in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2023.

How much traffic does FM-530th ST over W Fork Little Sioux carry?

About 898 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is FM-530th ST over W Fork Little Sioux?

The structure is 50 ft (15.2 m) long with a longest span of 18 ft (5.5 m).

Who owns FM-530th ST over W Fork Little Sioux?

It is owned by the County Highway Agency.