US Bridges

FM over Walnut Creek Trib

Fair

Montgomery County, Iowa · 071390404 · Structure no. 000000000254830

Built
1966
59 years old
Condition
Fair
inspected May 2021
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
150
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Walnut Creek Trib is a concrete continuous culvert carrying FM over Walnut Creek Trib in Montgomery County, Iowa. It was built in 1966, so it is 59 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 150 vehicles a day, projected to reach 150 by 2043. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesFM
CrossesWalnut Creek Trib
Location071390404
RouteCounty Highway 0
CountyMontgomery County
StateIowa
Coordinates40.97473, -95.34681
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 20
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2022)
Projected traffic150 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Walnut Creek Trib built?

It was built in 1966, making it 59 years old in 2025.

What condition is FM over Walnut Creek Trib 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 2021.

How much traffic does FM over Walnut Creek Trib carry?

About 150 vehicles per day (2022 count).

How long is FM over Walnut Creek Trib?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m).

Who owns FM over Walnut Creek Trib?

It is owned by the County Highway Agency.