US Bridges

FM over Crooked Creek

Fair

Washington County, Iowa · 074071606 · Structure no. 000000000335761

Built
1940
85 years old, rebuilt 2014
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
323 ft
2 main spans
Daily traffic
1,720
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Crooked Creek is a prestressed concrete stringer/multi-beam or girder carrying FM over Crooked Creek in Washington County, Iowa. It was built in 1940 and reconstructed in 2014, so it is 85 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 1,720 vehicles a day, projected to reach 1,720 by 2043. The structure is 323 ft (98.5 m) long and 33 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

Location

Open in Google Maps
CarriesFM
CrossesCrooked Creek
Location074071606
RouteCounty Highway 0
CountyWashington County
StateIowa
Coordinates41.21067, -91.66262
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating65.5 US tons
Inventory rating39.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2 (+4 approach)
Design loadH 20
Structure length323 ft (98.5 m)
Longest span76 ft (23.2 m)
Deck width33 ft (10.2 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,720 (2022)
Projected traffic1,720 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.3 mi (31 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Crooked Creek built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 2014.

What condition is FM 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 February 2023.

How much traffic does FM over Crooked Creek carry?

About 1,720 vehicles per day (2022 count).

How long is FM over Crooked Creek?

The structure is 323 ft (98.5 m) long with a longest span of 76 ft (23.2 m) and a deck 33 ft wide.

Who owns FM over Crooked Creek?

It is owned by the County Highway Agency.