US Bridges

FM K-18 over Stream

Fair

Plymouth County, Iowa · 091481104 · Structure no. 000000000273771

Built
1979
46 years old
Condition
Fair
inspected June 2024
Type
Culvert
Concrete
Length
23 ft
2 main spans
Daily traffic
429
2022 count
Owner
County
County Highway Agency

About this bridge

FM K-18 over Stream is a concrete culvert carrying FM K-18 over Stream in Plymouth County, Iowa. It was built in 1979, so it is 46 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 429 vehicles a day, roughly 14% of them trucks, projected to reach 429 by 2044. The structure is 23 ft (7 m) long.

CarriesFM K-18
CrossesStream
Location091481104
RouteCounty Highway 0
StateIowa
Coordinates42.72139, -96.47358
Functional classRural Minor 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 inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.2 US tons
Inventory rating34.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length23 ft (7 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 traffic429 (2022)
Projected traffic429 by 2044
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM K-18 over Stream built?

It was built in 1979, making it 46 years old in 2025.

What condition is FM K-18 over Stream 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 June 2024.

How much traffic does FM K-18 over Stream carry?

About 429 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is FM K-18 over Stream?

The structure is 23 ft (7 m) long with a longest span of 10 ft (3 m).

Who owns FM K-18 over Stream?

It is owned by the County Highway Agency.