US Bridges

I-70 HWY WB (kta) over Natural Lake

Good

Douglas County, Kansas · 2.12 MI E US-40 & 59 · Structure no. 999907000230563

Built
1956
69 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
263 ft
7 main spans
Daily traffic
17,657
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

I-70 HWY WB (kta) over Natural Lake is a steel continuous stringer/multi-beam or girder carrying I-70 HWY WB (kta) over Natural Lake in Douglas 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 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.

It carries about 17,657 vehicles a day, roughly 19% of them trucks, projected to reach 22,862 by 2044. The structure is 263 ft (80.2 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-70 HWY WB (kta)
CrossesNatural Lake
Location2.12 MI E US-40 & 59
RouteInterstate 70
CountyDouglas County
StateKansas
Coordinates38.995, -95.19389
Functional classRural Principal Arterial - Interstate

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 protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating64 US tons
Inventory rating38.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20 + Mod
Structure length263 ft (80.2 m)
Longest span40 ft (12.2 m)
Deck width34 ft (10.5 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,657 (2023)
Projected traffic22,862 by 2044
Trucks19%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a toll road
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-70 HWY WB (kta) over Natural Lake built?

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

What condition is I-70 HWY WB (kta) over Natural Lake 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 July 2024.

How much traffic does I-70 HWY WB (kta) over Natural Lake carry?

About 17,657 vehicles per day (2023 count), of which roughly 19% are trucks.

How long is I-70 HWY WB (kta) over Natural Lake?

The structure is 263 ft (80.2 m) long with a longest span of 40 ft (12.2 m) and a deck 34 ft wide.

Who owns I-70 HWY WB (kta) over Natural Lake?

It is owned by the State Toll Authority.