US Bridges

NW 120th RD over Bluff Creek

FairPosted for load

Harper County, Kansas · 6.0N 0.9W of Attica · Structure no. 000390721206680

Built
1956
69 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
52 ft
3 main spans
Daily traffic
75
2021 count
Owner
County
County Highway Agency

About this bridge

NW 120th RD over Bluff Creek is a wood or timber stringer/multi-beam or girder carrying NW 120th RD over Bluff Creek in Harper County, Kansas. It was built in 1956, so it is 69 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 75 vehicles a day, roughly 20% of them trucks, projected to reach 10 by 2043. The structure is 52 ft (15.8 m) long and 18 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesNW 120th RD
CrossesBluff Creek
Location6.0N 0.9W of Attica
RouteCounty Highway 0
CountyHarper County
StateKansas
Coordinates37.32634, -98.23736
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating5.2 US tons
Inventory rating3.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadUnknown
Structure length52 ft (15.8 m)
Longest span17 ft (5.1 m)
Deck width18 ft (5.5 m)
Roadway width17 ft (5.2 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic75 (2021)
Projected traffic10 by 2043
Trucks20%
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 statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$390,000
NavigationNo navigation control on waterway

Frequently asked questions

When was NW 120th RD over Bluff Creek built?

It was built in 1956, making it 69 years old in 2025.

What condition is NW 120th RD over Bluff Creek 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 February 2023.

How much traffic does NW 120th RD over Bluff Creek carry?

About 75 vehicles per day (2021 count), of which roughly 20% are trucks.

How long is NW 120th RD over Bluff Creek?

The structure is 52 ft (15.8 m) long with a longest span of 17 ft (5.1 m) and a deck 18 ft wide.

Who owns NW 120th RD over Bluff Creek?

It is owned by the County Highway Agency.