US Bridges

Ia 10 over Big Sioux River

Fair

Sioux County, Iowa · At S Dakota St. Line · Structure no. 000000000048451

Built
1991
34 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
518 ft
6 main spans
Daily traffic
1,910
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 10 over Big Sioux River is a prestressed concrete stringer/multi-beam or girder carrying Ia 10 over Big Sioux River in Sioux County, Iowa. It was built in 1991, so it is 34 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 1,910 vehicles a day, roughly 23% of them trucks, projected to reach 1,910 by 2043. The structure is 518 ft (157.9 m) long and 43 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesIa 10
CrossesBig Sioux River
LocationAt S Dakota St. Line
RouteState Highway 10
CountySioux County
StateIowa
Coordinates43.05148, -96.48936
Functional classRural Minor Arterial

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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating66.1 US tons
Inventory rating36.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length518 ft (157.9 m)
Longest span97 ft (29.6 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,910 (2022)
Projected traffic1,910 by 2043
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Ia 10 over Big Sioux River built?

It was built in 1991, making it 34 years old in 2025.

What condition is Ia 10 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 October 2023.

How much traffic does Ia 10 over Big Sioux River carry?

About 1,910 vehicles per day (2022 count), of which roughly 23% are trucks.

How long is Ia 10 over Big Sioux River?

The structure is 518 ft (157.9 m) long with a longest span of 97 ft (29.6 m) and a deck 43 ft wide.

Who owns Ia 10 over Big Sioux River?

It is owned by the State Highway Agency.