US Bridges

I-35 HWY SB (kta) over Cottonwood River

Fair

Lyon County, Kansas · 8.50 MI NE Chase CO Line · Structure no. 999903500560663

Built
1956
69 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
504 ft
5 main spans
Daily traffic
9,014
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

I-35 HWY SB (kta) over Cottonwood River is a steel continuous stringer/multi-beam or girder carrying I-35 HWY SB (kta) over Cottonwood River in Lyon County, Kansas. It was built in 1956, so it is 69 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 9,014 vehicles a day, roughly 28% of them trucks, projected to reach 11,443 by 2044. The structure is 504 ft (153.5 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-35 HWY SB (kta)
CrossesCottonwood River
Location8.50 MI NE Chase CO Line
RouteInterstate 35
CountyLyon County
StateKansas
Coordinates38.38667, -96.25806
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating78.9 US tons
Inventory rating47.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadH 20
Structure length504 ft (153.5 m)
Longest span109 ft (33.2 m)
Deck width34 ft (10.5 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,014 (2023)
Projected traffic11,443 by 2044
Trucks28%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn an Interstate toll segment under Secretarial agreement
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
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 SB (kta) over Cottonwood River built?

It was built in 1956, making it 69 years old in 2025.

What condition is I-35 HWY SB (kta) over Cottonwood 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 August 2023.

How much traffic does I-35 HWY SB (kta) over Cottonwood River carry?

About 9,014 vehicles per day (2023 count), of which roughly 28% are trucks.

How long is I-35 HWY SB (kta) over Cottonwood River?

The structure is 504 ft (153.5 m) long with a longest span of 109 ft (33.2 m) and a deck 34 ft wide.

Who owns I-35 HWY SB (kta) over Cottonwood River?

It is owned by the State Toll Authority.