US Bridges

Riverton RD.8.70 over Trib N Fk Ninnescah Riv

Poor

Reno County, Kansas · 4.2N 2.6W Pretty Prairie · Structure no. 000780741005963

Built
1994
31 years old
Condition
Poor
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
31 ft
1 main span
Daily traffic
10
2021 count
Owner
County
County Highway Agency

About this bridge

Riverton RD.8.70 over Trib N Fk Ninnescah Riv is a steel stringer/multi-beam or girder carrying Riverton RD.8.70 over Trib N Fk Ninnescah Riv in Reno County, Kansas. It was built in 1994, so it is 31 years old, younger than the Kansas average of 52.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: open, posting recommended but not legally implemented.

It carries about 10 vehicles a day, roughly 5% of them trucks, projected to reach 10 by 2046. The structure is 31 ft (9.3 m) long and 29 ft wide. If it were closed, the detour would be 198.8 mi (320 km).

CarriesRiverton RD.8.70
CrossesTrib N Fk Ninnescah Riv
Location4.2N 2.6W Pretty Prairie
RouteCounty Highway 0
StateKansas
Coordinates37.85039, -98.06844
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, posting recommended but not legally implemented
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.7 US tons
Inventory rating22.6 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20
Structure length31 ft (9.3 m)
Longest span29 ft (8.9 m)
Deck width29 ft (8.7 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic10 (2021)
Projected traffic10 by 2046
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed198.8 mi (320 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 Riverton RD.8.70 over Trib N Fk Ninnescah Riv built?

It was built in 1994, making it 31 years old in 2025.

What condition is Riverton RD.8.70 over Trib N Fk Ninnescah Riv in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2024.

How much traffic does Riverton RD.8.70 over Trib N Fk Ninnescah Riv carry?

About 10 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is Riverton RD.8.70 over Trib N Fk Ninnescah Riv?

The structure is 31 ft (9.3 m) long with a longest span of 29 ft (8.9 m) and a deck 29 ft wide.

Who owns Riverton RD.8.70 over Trib N Fk Ninnescah Riv?

It is owned by the County Highway Agency.