US Bridges

SW 70th over Walnut River

Good

Butler County, Kansas · 3.3E 3.0N of Augusta · Structure no. 000080867306140

Built
1992
33 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
222 ft
3 main spans
Daily traffic
40
Owner
County
County Highway Agency

About this bridge

SW 70th over Walnut River is a steel continuous stringer/multi-beam or girder carrying SW 70th over Walnut River in Butler County, Kansas. It was built in 1992, so it is 33 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 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 40 vehicles a day, roughly 5% of them trucks, projected to reach 50 by 2045. The structure is 222 ft (67.8 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesSW 70th
CrossesWalnut River
Location3.3E 3.0N of Augusta
RouteCounty Highway 0
StateKansas
Coordinates37.72292, -96.91162
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.9 US tons
Inventory rating41.3 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length222 ft (67.8 m)
Longest span90 ft (27.4 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic40 (—)
Projected traffic50 by 2045
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SW 70th over Walnut River built?

It was built in 1992, making it 33 years old in 2025.

What condition is SW 70th over Walnut 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 July 2024.

How much traffic does SW 70th over Walnut River carry?

About 40 vehicles per day (latest count), of which roughly 5% are trucks.

How long is SW 70th over Walnut River?

The structure is 222 ft (67.8 m) long with a longest span of 90 ft (27.4 m) and a deck 30 ft wide.

Who owns SW 70th over Walnut River?

It is owned by the County Highway Agency.