US Bridges

FM over Walnut Creek

Poor

Poweshiek County, Iowa · 081141306 · Structure no. 000000000294361

Built
1990
35 years old
Condition
Poor
inspected December 2023
Type
Slab
Concrete Continuous
Length
135 ft
3 main spans
Daily traffic
650
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Walnut Creek is a concrete continuous slab carrying FM over Walnut Creek in Poweshiek County, Iowa. It was built in 1990, so it is 35 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 650 vehicles a day, roughly 20% of them trucks, projected to reach 650 by 2043. The structure is 135 ft (41.1 m) long and 33 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesFM
CrossesWalnut Creek
Location081141306
RouteCounty Highway 0
StateIowa
Coordinates41.82704, -92.43093
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating91.4 US tons
Inventory rating54.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length135 ft (41.1 m)
Longest span53 ft (16.2 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic650 (2022)
Projected traffic650 by 2043
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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$30,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Walnut Creek built?

It was built in 1990, making it 35 years old in 2025.

What condition is FM over Walnut Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in December 2023.

How much traffic does FM over Walnut Creek carry?

About 650 vehicles per day (2022 count), of which roughly 20% are trucks.

How long is FM over Walnut Creek?

The structure is 135 ft (41.1 m) long with a longest span of 53 ft (16.2 m) and a deck 33 ft wide.

Who owns FM over Walnut Creek?

It is owned by the County Highway Agency.