US Bridges

30th RD over Walnut River

FairPosted for load

Cowley County, Kansas · 1.9W of Rock · Structure no. 000000000180210

Built
1928
97 years old
Condition
Fair
inspected January 2024
Type
Truss - Thru
Steel
Length
334 ft
2 main spans
Daily traffic
240
2021 count
Owner
County
County Highway Agency

About this bridge

30th RD over Walnut River is a steel truss - thru carrying 30th RD over Walnut River in Cowley County, Kansas. It was built in 1928, so it is 97 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 240 vehicles a day, roughly 10% of them trucks, projected to reach 290 by 2044. The structure is 334 ft (101.8 m) long and 21 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries30th RD
CrossesWalnut River
Location1.9W of Rock
RouteCounty Highway 159
CountyCowley County
StateKansas
Coordinates37.43719, -97.04041
Functional classRural Major Collector

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31 US tons
Inventory rating18 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans2 (+4 approach)
Design loadH 15
Structure length334 ft (101.8 m)
Longest span100 ft (30.5 m)
Deck width21 ft (6.5 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic240 (2021)
Projected traffic290 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 30th RD over Walnut River built?

It was built in 1928, making it 97 years old in 2025.

What condition is 30th RD over Walnut 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 2024.

How much traffic does 30th RD over Walnut River carry?

About 240 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is 30th RD over Walnut River?

The structure is 334 ft (101.8 m) long with a longest span of 100 ft (30.5 m) and a deck 21 ft wide.

Who owns 30th RD over Walnut River?

It is owned by the County Highway Agency.