US Bridges

120th Ave over North Branch Slate Crk.

FairPosted for load

Sumner County, Kansas · 5.9E 0.1N of Milton · Structure no. 000960783906529

Built
1960
65 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
41 ft
2 main spans
Daily traffic
10
2012 count
Owner
County
County Highway Agency

About this bridge

120th Ave over North Branch Slate Crk. is a steel continuous stringer/multi-beam or girder carrying 120th Ave over North Branch Slate Crk. in Sumner County, Kansas. It was built in 1960, so it is 65 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 6 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 10 vehicles a day, projected to reach 10 by 2041. The structure is 41 ft (12.4 m) long and 20 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries120th Ave
CrossesNorth Branch Slate Crk.
Location5.9E 0.1N of Milton
RouteCounty Highway 0
CountySumner County
StateKansas
Coordinates37.43136, -97.66548
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating18.3 US tons
Inventory rating11 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckAluminum
Main spans2
Design loadUnknown
Structure length41 ft (12.4 m)
Longest span18 ft (5.6 m)
Deck width20 ft (6.2 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic10 (2012)
Projected traffic10 by 2041
Trucks0%
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 120th Ave over North Branch Slate Crk. built?

It was built in 1960, making it 65 years old in 2025.

What condition is 120th Ave over North Branch Slate Crk. 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 June 2023.

How much traffic does 120th Ave over North Branch Slate Crk. carry?

About 10 vehicles per day (2012 count).

How long is 120th Ave over North Branch Slate Crk.?

The structure is 41 ft (12.4 m) long with a longest span of 18 ft (5.6 m) and a deck 20 ft wide.

Who owns 120th Ave over North Branch Slate Crk.?

It is owned by the County Highway Agency.