US Bridges

FM over Rat Creek

Fair

Lyon County, Iowa · 098431301 · Structure no. 000000000228011

Built
1971
54 years old
Condition
Fair
inspected July 2023
Type
Culvert
Concrete Continuous
Length
36 ft
3 main spans
Daily traffic
399
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Rat Creek is a concrete continuous culvert carrying FM over Rat Creek in Lyon County, Iowa. It was built in 1971, so it is 54 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 399 vehicles a day, roughly 27% of them trucks, projected to reach 399 by 2043. The structure is 36 ft (11 m) long. If it were closed, the detour would be 3.1 mi (5 km).

CarriesFM
CrossesRat Creek
Location098431301
RouteCounty Highway 0
StateIowa
Coordinates43.31557, -95.86137
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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating48.9 US tons
Inventory rating29.3 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadH 20
Structure length36 ft (11 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic399 (2022)
Projected traffic399 by 2043
Trucks27%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Rat Creek built?

It was built in 1971, making it 54 years old in 2025.

What condition is FM over Rat 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 July 2023.

How much traffic does FM over Rat Creek carry?

About 399 vehicles per day (2022 count), of which roughly 27% are trucks.

How long is FM over Rat Creek?

The structure is 36 ft (11 m) long with a longest span of 12 ft (3.7 m).

Who owns FM over Rat Creek?

It is owned by the County Highway Agency.