US Bridges

K3 HWY over Marmaton River

Fair

Bourbon County, Kansas · 8.11 MI N Wjct K39 · Structure no. 999900300060281

Built
1965
60 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
328 ft
3 main spans
Daily traffic
590
2023 count
Owner
State
State Highway Agency

About this bridge

K3 HWY over Marmaton River is a steel continuous stringer/multi-beam or girder carrying K3 HWY over Marmaton River in Bourbon County, Kansas. It was built in 1965, so it is 60 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 5 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 590 vehicles a day, roughly 17% of them trucks, projected to reach 602 by 2044. The structure is 328 ft (100 m) long and 32 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesK3 HWY
CrossesMarmaton River
Location8.11 MI N Wjct K39
RouteState Highway 3
CountyBourbon County
StateKansas
Coordinates37.83528, -94.98111
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating48.8 US tons
Inventory rating29.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length328 ft (100 m)
Longest span125 ft (38.1 m)
Deck width32 ft (9.8 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic590 (2023)
Projected traffic602 by 2044
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 K3 HWY over Marmaton River built?

It was built in 1965, making it 60 years old in 2025.

What condition is K3 HWY over Marmaton River 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 February 2024.

How much traffic does K3 HWY over Marmaton River carry?

About 590 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is K3 HWY over Marmaton River?

The structure is 328 ft (100 m) long with a longest span of 125 ft (38.1 m) and a deck 32 ft wide.

Who owns K3 HWY over Marmaton River?

It is owned by the State Highway Agency.