US Bridges

Ia 78 over Crooked Creek

Fair

Henry County, Iowa · 0.2 Mi. E of S.R. W-47 · Structure no. 000000000028550

Built
1951
74 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
246 ft
3 main spans
Daily traffic
1,170
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 78 over Crooked Creek is a steel continuous stringer/multi-beam or girder carrying Ia 78 over Crooked Creek in Henry County, Iowa. It was built in 1951, so it is 74 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 1,170 vehicles a day, roughly 21% of them trucks, projected to reach 1,170 by 2042. The structure is 246 ft (75 m) long and 32 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesIa 78
CrossesCrooked Creek
Location0.2 Mi. E of S.R. W-47
RouteState Highway 78
CountyHenry County
StateIowa
Coordinates41.15892, -91.70861
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 inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to 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 alignment6: Equal to present minimum criteria
Operating rating43.8 US tons
Inventory rating26.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length246 ft (75 m)
Longest span94 ft (28.7 m)
Deck width32 ft (9.8 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,170 (2022)
Projected traffic1,170 by 2042
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 78 over Crooked Creek built?

It was built in 1951, making it 74 years old in 2025.

What condition is Ia 78 over Crooked 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 May 2023.

How much traffic does Ia 78 over Crooked Creek carry?

About 1,170 vehicles per day (2022 count), of which roughly 21% are trucks.

How long is Ia 78 over Crooked Creek?

The structure is 246 ft (75 m) long with a longest span of 94 ft (28.7 m) and a deck 32 ft wide.

Who owns Ia 78 over Crooked Creek?

It is owned by the State Highway Agency.