US Bridges

NW 20 Ave P-1.8 over Sand Creek

FairPosted for load

Harper County, Kansas · 0.8S of Duquoin · Structure no. 000390739006608

Built
1929
96 years old
Condition
Fair
inspected February 2023
Type
Arch - Thru
Concrete
Length
90 ft
1 main span
Daily traffic
30
2021 count
Owner
County
County Highway Agency

About this bridge

NW 20 Ave P-1.8 over Sand Creek is a concrete arch - thru carrying NW 20 Ave P-1.8 over Sand Creek in Harper County, Kansas. It was built in 1929, so it is 96 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 30 vehicles a day, projected to reach 30 by 2043. The structure is 90 ft (27.4 m) long and 26 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNW 20 Ave P-1.8
CrossesSand Creek
Location0.8S of Duquoin
RouteCounty Highway 0
CountyHarper County
StateKansas
Coordinates37.37331, -98.07639
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
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating23.5 US tons
Inventory rating14.1 US tons

Structure

Structure typeArch - Thru
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length90 ft (27.4 m)
Longest span90 ft (27.4 m)
Deck width26 ft (7.9 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic30 (2021)
Projected traffic30 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 20 Ave P-1.8 over Sand Creek built?

It was built in 1929, making it 96 years old in 2025.

What condition is NW 20 Ave P-1.8 over Sand 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 20 Ave P-1.8 over Sand Creek carry?

About 30 vehicles per day (2021 count).

How long is NW 20 Ave P-1.8 over Sand Creek?

The structure is 90 ft (27.4 m) long with a longest span of 90 ft (27.4 m) and a deck 26 ft wide.

Who owns NW 20 Ave P-1.8 over Sand Creek?

It is owned by the County Highway Agency.