US Bridges

Ia 1 over West Fork Crooked Creek

Good

Washington County, Iowa · 1.2 Miles South of Ia 92 · Structure no. 000000000051631

Built
2016
9 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
258 ft
3 main spans
Daily traffic
2,600
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 1 over West Fork Crooked Creek is a prestressed concrete stringer/multi-beam or girder carrying Ia 1 over West Fork Crooked Creek in Washington County, Iowa. It was built in 2016, so it is 9 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 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 2,600 vehicles a day, roughly 9% of them trucks, projected to reach 2,600 by 2044. The structure is 258 ft (78.5 m) long and 47 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesIa 1
CrossesWest Fork Crooked Creek
Location1.2 Miles South of Ia 92
RouteState Highway 1
StateIowa
Coordinates41.28148, -91.71626
Functional classRural Principal Arterial - Other

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 protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal 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 length258 ft (78.5 m)
Longest span92 ft (28 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,600 (2022)
Projected traffic2,600 by 2044
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemYes

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 1 over West Fork Crooked Creek built?

It was built in 2016, making it 9 years old in 2025.

What condition is Ia 1 over West Fork Crooked 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 April 2024.

How much traffic does Ia 1 over West Fork Crooked Creek carry?

About 2,600 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is Ia 1 over West Fork Crooked Creek?

The structure is 258 ft (78.5 m) long with a longest span of 92 ft (28 m) and a deck 47 ft wide.

Who owns Ia 1 over West Fork Crooked Creek?

It is owned by the State Highway Agency.