US Bridges

Ia 12 over Broken Kettle Creek

Fair

Plymouth County, Iowa · 0.1 MI N of S JCT SR K18 · Structure no. 000000000039930

Built
1956
69 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
152 ft
3 main spans
Daily traffic
1,940
2023 count
Owner
State
State Highway Agency

About this bridge

Ia 12 over Broken Kettle Creek is a steel continuous stringer/multi-beam or girder carrying Ia 12 over Broken Kettle Creek in Plymouth County, Iowa. It was built in 1956, so it is 69 years old, older 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 1,940 vehicles a day, roughly 14% of them trucks, projected to reach 1,940 by 2043. The structure is 152 ft (46.3 m) long and 34 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesIa 12
CrossesBroken Kettle Creek
Location0.1 MI N of S JCT SR K18
RouteState Highway 12
CountyPlymouth County
StateIowa
Coordinates42.62769, -96.51401
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating30 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length152 ft (46.3 m)
Longest span59 ft (18 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,940 (2023)
Projected traffic1,940 by 2043
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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 Broken Kettle Creek built?

It was built in 1956, making it 69 years old in 2025.

What condition is Ia 12 over Broken Kettle Creek 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 2023.

How much traffic does Ia 12 over Broken Kettle Creek carry?

About 1,940 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is Ia 12 over Broken Kettle Creek?

The structure is 152 ft (46.3 m) long with a longest span of 59 ft (18 m) and a deck 34 ft wide.

Who owns Ia 12 over Broken Kettle Creek?

It is owned by the State Highway Agency.