US Bridges

Rs 405 8 over Trib. Marais Des Cygnes

Fair

Linn County, Kansas · 2.5W 1.9S of LA Cygnes · Structure no. 000000000540022

Built
1955
70 years old
Condition
Fair
inspected March 2024
Type
Culvert
Concrete
Length
43 ft
4 main spans
Daily traffic
352
2006 count
Owner
County
County Highway Agency

About this bridge

Rs 405 8 over Trib. Marais Des Cygnes is a concrete culvert carrying Rs 405 8 over Trib. Marais Des Cygnes in Linn County, Kansas. It was built in 1955, so it is 70 years old, older than the Kansas average of 52.8 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 352 vehicles a day, roughly 10% of them trucks, projected to reach 400 by 2044. The structure is 43 ft (13 m) long and 28 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesRs 405 8
CrossesTrib. Marais Des Cygnes
Location2.5W 1.9S of LA Cygnes
RouteCounty Highway 405
CountyLinn County
StateKansas
Coordinates38.3183, -94.79895
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 inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadH 15
Structure length43 ft (13 m)
Longest span10 ft (3 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic352 (2006)
Projected traffic400 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Rs 405 8 over Trib. Marais Des Cygnes built?

It was built in 1955, making it 70 years old in 2025.

What condition is Rs 405 8 over Trib. Marais Des Cygnes 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 March 2024.

How much traffic does Rs 405 8 over Trib. Marais Des Cygnes carry?

About 352 vehicles per day (2006 count), of which roughly 10% are trucks.

How long is Rs 405 8 over Trib. Marais Des Cygnes?

The structure is 43 ft (13 m) long with a longest span of 10 ft (3 m) and a deck 28 ft wide.

Who owns Rs 405 8 over Trib. Marais Des Cygnes?

It is owned by the County Highway Agency.