US Bridges

Idaho (21.1-7) over Trib. to Eight Mile Ck.

Good

Franklin County, Kansas · 1.0W 1.0S of Centropolis · Structure no. 000301031004789

Built
1990
35 years old
Condition
Good
inspected June 2023
Type
Slab
Concrete Continuous
Length
93 ft
3 main spans
Daily traffic
30
2013 count
Owner
County
County Highway Agency

About this bridge

Idaho (21.1-7) over Trib. to Eight Mile Ck. is a concrete continuous slab carrying Idaho (21.1-7) over Trib. to Eight Mile Ck. in Franklin County, Kansas. It was built in 1990, so it is 35 years old, younger than the Kansas average of 52.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 30 vehicles a day, projected to reach 35 by 2043. The structure is 93 ft (28.4 m) long and 26 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesIdaho (21.1-7)
CrossesTrib. to Eight Mile Ck.
Location1.0W 1.0S of Centropolis
RouteCounty Highway 0
CountyFranklin County
StateKansas
Coordinates38.69676, -95.37155
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating67.5 US tons
Inventory rating45.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length93 ft (28.4 m)
Longest span36 ft (11 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic30 (2013)
Projected traffic35 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Idaho (21.1-7) over Trib. to Eight Mile Ck. built?

It was built in 1990, making it 35 years old in 2025.

What condition is Idaho (21.1-7) over Trib. to Eight Mile Ck. in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.

How much traffic does Idaho (21.1-7) over Trib. to Eight Mile Ck. carry?

About 30 vehicles per day (2013 count).

How long is Idaho (21.1-7) over Trib. to Eight Mile Ck.?

The structure is 93 ft (28.4 m) long with a longest span of 36 ft (11 m) and a deck 26 ft wide.

Who owns Idaho (21.1-7) over Trib. to Eight Mile Ck.?

It is owned by the County Highway Agency.