US Bridges

Ia 12 over Dry Creek

Good

Sioux County, Iowa · 0.4 Mi. S of Ia 10 · Structure no. 000000000048580

Built
1963
62 years old
Condition
Good
inspected June 2024
Type
Slab
Concrete Continuous
Length
127 ft
3 main spans
Daily traffic
2,580
2023 count
Owner
State
State Highway Agency

About this bridge

Ia 12 over Dry Creek is a concrete continuous slab carrying Ia 12 over Dry Creek in Sioux County, Iowa. It was built in 1963, so it is 62 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,580 vehicles a day, roughly 12% of them trucks, projected to reach 2,580 by 2043. The structure is 127 ft (38.7 m) long and 36 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesIa 12
CrossesDry Creek
Location0.4 Mi. S of Ia 10
RouteState Highway 12
StateIowa
Coordinates42.99124, -96.48867
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating67 US tons
Inventory rating40.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length127 ft (38.7 m)
Longest span49 ft (14.9 m)
Deck width36 ft (11 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,580 (2023)
Projected traffic2,580 by 2043
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 12 over Dry Creek built?

It was built in 1963, making it 62 years old in 2025.

What condition is Ia 12 over Dry Creek 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 June 2024.

How much traffic does Ia 12 over Dry Creek carry?

About 2,580 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is Ia 12 over Dry Creek?

The structure is 127 ft (38.7 m) long with a longest span of 49 ft (14.9 m) and a deck 36 ft wide.

Who owns Ia 12 over Dry Creek?

It is owned by the State Highway Agency.