US Bridges

70th Road over Trib. to S. Fork Solomon

PoorPosted for load

Osborne County, Kansas · 3.4E of Alton · Structure no. 000710653403740

Built
1920
105 years old
Condition
Poor
inspected December 2024
Type
Truss - Thru
Steel
Length
41 ft
1 main span
Daily traffic
5
2020 count
Owner
County
County Highway Agency

About this bridge

70th Road over Trib. to S. Fork Solomon is a steel truss - thru carrying 70th Road over Trib. to S. Fork Solomon in Osborne County, Kansas. It was built in 1920, so it is 105 years old, older 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: posted for load restriction.

It carries about 5 vehicles a day, projected to reach 10 by 2044. The structure is 41 ft (12.5 m) long and 16 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
Carries70th Road
CrossesTrib. to S. Fork Solomon
Location3.4E of Alton
RouteCounty Highway 0
CountyOsborne County
StateKansas
Coordinates39.46691, -98.88857
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, 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 inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating16.9 US tons
Inventory rating10.1 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length41 ft (12.5 m)
Longest span40 ft (12.1 m)
Deck width16 ft (4.9 m)
Roadway width15 ft (4.5 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic5 (2020)
Projected traffic10 by 2044
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$270,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 70th Road over Trib. to S. Fork Solomon built?

It was built in 1920, making it 105 years old in 2025.

What condition is 70th Road over Trib. to S. Fork Solomon 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 December 2024.

How much traffic does 70th Road over Trib. to S. Fork Solomon carry?

About 5 vehicles per day (2020 count).

How long is 70th Road over Trib. to S. Fork Solomon?

The structure is 41 ft (12.5 m) long with a longest span of 40 ft (12.1 m) and a deck 16 ft wide.

Who owns 70th Road over Trib. to S. Fork Solomon?

It is owned by the County Highway Agency.