US Bridges

I-35 HWY NB over Neosho River

Fair

Lyon County, Kansas · 3.69 MI East of K-99 · Structure no. 999903500561191

Built
1976
49 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
464 ft
5 main spans
Daily traffic
8,550
2023 count
Owner
State
State Highway Agency

About this bridge

I-35 HWY NB over Neosho River is a steel continuous stringer/multi-beam or girder carrying I-35 HWY NB over Neosho River in Lyon County, Kansas. It was built in 1976, so it is 49 years old, younger 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 8,550 vehicles a day, roughly 22% of them trucks, projected to reach 9,637 by 2044. The structure is 464 ft (141.3 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-35 HWY NB
CrossesNeosho River
Location3.69 MI East of K-99
RouteInterstate 35
CountyLyon County
StateKansas
Coordinates38.41083, -96.11806
Functional classRural Principal Arterial - Interstate

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length464 ft (141.3 m)
Longest span100 ft (30.5 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,550 (2023)
Projected traffic9,637 by 2044
Trucks22%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-35 HWY NB over Neosho River built?

It was built in 1976, making it 49 years old in 2025.

What condition is I-35 HWY NB over Neosho 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 January 2025.

How much traffic does I-35 HWY NB over Neosho River carry?

About 8,550 vehicles per day (2023 count), of which roughly 22% are trucks.

How long is I-35 HWY NB over Neosho River?

The structure is 464 ft (141.3 m) long with a longest span of 100 ft (30.5 m) and a deck 42 ft wide.

Who owns I-35 HWY NB over Neosho River?

It is owned by the State Highway Agency.