US Bridges

Ia 12 over Indian Creek

Good

Plymouth County, Iowa · 4.0 MI N of SR C16 · Structure no. 000000000040021

Built
2021
4 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
217 ft
3 main spans
Daily traffic
1,130
2023 count
Owner
State
State Highway Agency

About this bridge

Ia 12 over Indian Creek is a prestressed concrete stringer/multi-beam or girder carrying Ia 12 over Indian Creek in Plymouth County, Iowa. It was built in 2021, so it is 4 years old, younger 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,130 vehicles a day, roughly 27% of them trucks, projected to reach 1,130 by 2043. The structure is 217 ft (66.2 m) long and 43 ft wide. If it were closed, the detour would be 24.9 mi (40 km).

CarriesIa 12
CrossesIndian Creek
Location4.0 MI N of SR C16
RouteState Highway 12
StateIowa
Coordinates42.89035, -96.5172
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length217 ft (66.2 m)
Longest span77 ft (23.6 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,130 (2023)
Projected traffic1,130 by 2043
Trucks27%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 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 Indian Creek built?

It was built in 2021, making it 4 years old in 2025.

What condition is Ia 12 over Indian 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 May 2023.

How much traffic does Ia 12 over Indian Creek carry?

About 1,130 vehicles per day (2023 count), of which roughly 27% are trucks.

How long is Ia 12 over Indian Creek?

The structure is 217 ft (66.2 m) long with a longest span of 77 ft (23.6 m) and a deck 43 ft wide.

Who owns Ia 12 over Indian Creek?

It is owned by the State Highway Agency.