US Bridges

NW 70th Ave over Stream

FairPosted for load

Harper County, Kansas · 1.5S 3.0E of Attica · Structure no. 000390729006826

Built
1930
95 years old
Condition
Fair
inspected May 2023
Type
Culvert
Concrete
Length
26 ft
3 main spans
Daily traffic
80
2021 count
Owner
County
County Highway Agency

About this bridge

NW 70th Ave over Stream is a concrete culvert carrying NW 70th Ave over Stream in Harper County, Kansas. It was built in 1930, so it is 95 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 80 vehicles a day, roughly 5% of them trucks, projected to reach 80 by 2043. The structure is 26 ft (7.8 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesNW 70th Ave
CrossesStream
Location1.5S 3.0E of Attica
RouteCounty Highway 3905
CountyHarper County
StateKansas
Coordinates37.21636, -98.16628
Functional classRural Minor 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating9.6 US tons
Inventory rating5.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadUnknown
Structure length26 ft (7.8 m)
Longest span8 ft (2.4 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic80 (2021)
Projected traffic80 by 2043
Trucks5%
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 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 NW 70th Ave over Stream built?

It was built in 1930, making it 95 years old in 2025.

What condition is NW 70th Ave over Stream 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 May 2023.

How much traffic does NW 70th Ave over Stream carry?

About 80 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is NW 70th Ave over Stream?

The structure is 26 ft (7.8 m) long with a longest span of 8 ft (2.4 m) and a deck 31 ft wide.

Who owns NW 70th Ave over Stream?

It is owned by the County Highway Agency.