US Bridges

10th ST over Big Sioux River

Fair

Sioux County, Iowa · 000000000 · Structure no. 000000000504185

Built
1980
45 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
579 ft
5 main spans
Daily traffic
670
2022 count
Owner
County
County Highway Agency

About this bridge

10th ST over Big Sioux River is a steel continuous stringer/multi-beam or girder carrying 10th ST over Big Sioux River in Sioux County, Iowa. It was built in 1980, so it is 45 years old, younger 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 670 vehicles a day, roughly 12% of them trucks, projected to reach 670 by 2042. The structure is 579 ft (176.5 m) long and 35 ft wide.

Location

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Carries10th ST
CrossesBig Sioux River
Location000000000
RouteCity Street 0
CountySioux County
StateIowa
Coordinates42.998, -96.49813
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating68 US tons
Inventory rating40.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length579 ft (176.5 m)
Longest span125 ft (38.1 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic670 (2022)
Projected traffic670 by 2042
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 10th ST over Big Sioux River built?

It was built in 1980, making it 45 years old in 2025.

What condition is 10th ST over Big Sioux 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 April 2024.

How much traffic does 10th ST over Big Sioux River carry?

About 670 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is 10th ST over Big Sioux River?

The structure is 579 ft (176.5 m) long with a longest span of 125 ft (38.1 m) and a deck 35 ft wide.

Who owns 10th ST over Big Sioux River?

It is owned by the County Highway Agency.