US Bridges

Ia 56 over Pony Creek

Fair

Clayton County, Iowa · 0.1 Mi. W of Jct. Ia 13 · Structure no. 000000000604890

Built
1983
42 years old
Condition
Fair
inspected September 2023
Type
Culvert
Concrete Continuous
Length
52 ft
3 main spans
Daily traffic
1,280
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 56 over Pony Creek is a concrete continuous culvert carrying Ia 56 over Pony Creek in Clayton County, Iowa. It was built in 1983, so it is 42 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 1,280 vehicles a day, roughly 19% of them trucks, projected to reach 1,280 by 2043. The structure is 52 ft (15.9 m) long. If it were closed, the detour would be 3.1 mi (5 km).

CarriesIa 56
CrossesPony Creek
Location0.1 Mi. W of Jct. Ia 13
RouteState Highway 56
StateIowa
Coordinates42.84344, -91.40461
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating48 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length52 ft (15.9 m)
Longest span18 ft (5.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,280 (2022)
Projected traffic1,280 by 2043
Trucks19%
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 56 over Pony Creek built?

It was built in 1983, making it 42 years old in 2025.

What condition is Ia 56 over Pony 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 September 2023.

How much traffic does Ia 56 over Pony Creek carry?

About 1,280 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is Ia 56 over Pony Creek?

The structure is 52 ft (15.9 m) long with a longest span of 18 ft (5.5 m).

Who owns Ia 56 over Pony Creek?

It is owned by the State Highway Agency.