US Bridges

K18 HWY over Kansas River Drainage

Good

Riley County, Kansas · 6.07 MI E JCT K18 & K177 · Structure no. 999901800810471

Built
1975
50 years old
Condition
Good
inspected May 2023
Type
Culvert
Steel
Length
28 ft
4 main spans
Daily traffic
898
2023 count
Owner
State
State Highway Agency

About this bridge

K18 HWY over Kansas River Drainage is a steel culvert carrying K18 HWY over Kansas River Drainage in Riley County, Kansas. It was built in 1975, so it is 50 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 898 vehicles a day, roughly 7% of them trucks, projected to reach 1,283 by 2044. The structure is 28 ft (8.5 m) long and 40 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesK18 HWY
CrossesKansas River Drainage
Location6.07 MI E JCT K18 & K177
RouteState Highway 18
CountyRiley County
StateKansas
Coordinates39.15944, -96.445
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating39 US tons
Inventory rating31 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckCorrugated steel
Main spans4
Design loadH 20
Structure length28 ft (8.5 m)
Longest span5 ft (1.5 m)
Deck width40 ft (12.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic898 (2023)
Projected traffic1,283 by 2044
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 K18 HWY over Kansas River Drainage built?

It was built in 1975, making it 50 years old in 2025.

What condition is K18 HWY over Kansas River Drainage 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 May 2023.

How much traffic does K18 HWY over Kansas River Drainage carry?

About 898 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is K18 HWY over Kansas River Drainage?

The structure is 28 ft (8.5 m) long with a longest span of 5 ft (1.5 m) and a deck 40 ft wide.

Who owns K18 HWY over Kansas River Drainage?

It is owned by the State Highway Agency.