US Bridges

N.W. 70th. St. 81 over Walnut Creek

Good

Shawnee County, Kansas · 5.0N of Silver Lake · Structure no. 000890977804140

Built
2008
17 years old
Condition
Good
inspected August 2024
Type
Slab
Concrete Continuous
Length
123 ft
3 main spans
Daily traffic
300
2024 count
Owner
County
County Highway Agency

About this bridge

N.W. 70th. St. 81 over Walnut Creek is a concrete continuous slab carrying N.W. 70th. St. 81 over Walnut Creek in Shawnee County, Kansas. It was built in 2008, so it is 17 years old, younger 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 300 vehicles a day, projected to reach 300 by 2040. The structure is 123 ft (37.5 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesN.W. 70th. St. 81
CrossesWalnut Creek
Location5.0N of Silver Lake
RouteCounty Highway 0
CountyShawnee County
StateKansas
Coordinates39.17317, -95.85358
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
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 geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.4 US tons
Inventory rating27.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length123 ft (37.5 m)
Longest span48 ft (14.6 m)
Deck width30 ft (9.2 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic300 (2024)
Projected traffic300 by 2040
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$290,000
NavigationNo navigation control on waterway

Frequently asked questions

When was N.W. 70th. St. 81 over Walnut Creek built?

It was built in 2008, making it 17 years old in 2025.

What condition is N.W. 70th. St. 81 over Walnut Creek 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 August 2024.

How much traffic does N.W. 70th. St. 81 over Walnut Creek carry?

About 300 vehicles per day (2024 count).

How long is N.W. 70th. St. 81 over Walnut Creek?

The structure is 123 ft (37.5 m) long with a longest span of 48 ft (14.6 m) and a deck 30 ft wide.

Who owns N.W. 70th. St. 81 over Walnut Creek?

It is owned by the County Highway Agency.