US Bridges

NW 90 RD 8.0-G.1 over West Branch Bluff Creek

FairPosted for load

Harper County, Kansas · 11.0W of Harper · Structure no. 000390721106740

Built
1961
64 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
69 ft
4 main spans
Daily traffic
50
2021 count
Owner
County
County Highway Agency

About this bridge

NW 90 RD 8.0-G.1 over West Branch Bluff Creek is a wood or timber stringer/multi-beam or girder carrying NW 90 RD 8.0-G.1 over West Branch Bluff Creek in Harper County, Kansas. It was built in 1961, so it is 64 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 50 vehicles a day, roughly 20% of them trucks, projected to reach 10 by 2043. The structure is 69 ft (21 m) long and 20 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesNW 90 RD 8.0-G.1
CrossesWest Branch Bluff Creek
Location11.0W of Harper
RouteCounty Highway 0
CountyHarper County
StateKansas
Coordinates37.28287, -98.23844
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.
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 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating9.1 US tons
Inventory rating6.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans4
Design loadUnknown
Structure length69 ft (21 m)
Longest span17 ft (5.3 m)
Deck width20 ft (6.1 m)
Roadway width19 ft (5.8 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic50 (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 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 NW 90 RD 8.0-G.1 over West Branch Bluff Creek built?

It was built in 1961, making it 64 years old in 2025.

What condition is NW 90 RD 8.0-G.1 over West Branch 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 90 RD 8.0-G.1 over West Branch Bluff Creek carry?

About 50 vehicles per day (2021 count), of which roughly 20% are trucks.

How long is NW 90 RD 8.0-G.1 over West Branch Bluff Creek?

The structure is 69 ft (21 m) long with a longest span of 17 ft (5.3 m) and a deck 20 ft wide.

Who owns NW 90 RD 8.0-G.1 over West Branch Bluff Creek?

It is owned by the County Highway Agency.