US Bridges

311th Street over Trib. Marais Des Cygnes

PoorPosted for load

Miami County, Kansas · 1.0S 7.7W of Paola · Structure no. 000611069204980

Built
1918
107 years old
Condition
Poor
inspected August 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
33 ft
1 main span
Daily traffic
30
2011 count
Owner
County
County Highway Agency

About this bridge

311th Street over Trib. Marais Des Cygnes is a concrete stringer/multi-beam or girder carrying 311th Street over Trib. Marais Des Cygnes in Miami County, Kansas. It was built in 1918, so it is 107 years old, older than the Kansas average of 52.8 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. Its operating status is: posted for load restriction.

It carries about 30 vehicles a day, projected to reach 51 by 2043. The structure is 33 ft (10.1 m) long and 16 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries311th Street
CrossesTrib. Marais Des Cygnes
Location1.0S 7.7W of Paola
RouteCounty Highway 0
CountyMiami County
StateKansas
Coordinates38.56434, -95.02122
Functional classRural Local

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating26 US tons
Inventory rating17 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length33 ft (10.1 m)
Longest span31 ft (9.6 m)
Deck width16 ft (4.9 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic30 (2011)
Projected traffic51 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$350,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 311th Street over Trib. Marais Des Cygnes built?

It was built in 1918, making it 107 years old in 2025.

What condition is 311th Street over Trib. Marais Des Cygnes 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 August 2024.

How much traffic does 311th Street over Trib. Marais Des Cygnes carry?

About 30 vehicles per day (2011 count).

How long is 311th Street over Trib. Marais Des Cygnes?

The structure is 33 ft (10.1 m) long with a longest span of 31 ft (9.6 m) and a deck 16 ft wide.

Who owns 311th Street over Trib. Marais Des Cygnes?

It is owned by the County Highway Agency.