US Bridges

National Avenue over Marmaton River

GoodPosted for load

Bourbon County, Kansas · North of Fort Scott · Structure no. 409250061307014

Built
1933
92 years old, rebuilt 2012
Condition
Good
inspected September 2022
Type
Arch - Thru
Concrete
Length
202 ft
1 main span
Daily traffic
2,865
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

National Avenue over Marmaton River is a concrete arch - thru carrying National Avenue over Marmaton River in Bourbon County, Kansas. It was built in 1933 and reconstructed in 2012, so it is 92 years old, older than the Kansas average of 52.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. Its operating status is: posted for load restriction.

It carries about 2,865 vehicles a day, roughly 8% of them trucks, projected to reach 5,500 by 2039. The structure is 202 ft (61.6 m) long and 50 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

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CarriesNational Avenue
CrossesMarmaton River
LocationNorth of Fort Scott
RouteCity Street 1307
CountyBourbon County
StateKansas
Coordinates37.84628, -94.70733
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2022
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating22 US tons
Inventory rating13.2 US tons

Structure

Structure typeArch - Thru
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length202 ft (61.6 m)
Longest span197 ft (60.1 m)
Deck width50 ft (15.1 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deck30 ft (9 m)

Traffic and service

Average daily traffic2,865 (2020)
Projected traffic5,500 by 2039
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed2.5 mi (4 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was National Avenue over Marmaton River built?

It was built in 1933, making it 92 years old in 2025. It was reconstructed in 2012.

What condition is National Avenue over Marmaton River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2022.

How much traffic does National Avenue over Marmaton River carry?

About 2,865 vehicles per day (2020 count), of which roughly 8% are trucks.

How long is National Avenue over Marmaton River?

The structure is 202 ft (61.6 m) long with a longest span of 197 ft (60.1 m) and a deck 50 ft wide.

Who owns National Avenue over Marmaton River?

It is owned by the City or Municipal Highway Agency.