US Bridges

Ison LN over NS (cno&tp) System

FairPosted for load

Mercer County, Kentucky · .1 MI W of JCT Ky 342 · Structure no. 084R00604N

Built
1940
85 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
94 ft
5 main spans
Daily traffic
84
2022 count
Owner
Railroad
Railroad

About this bridge

Ison LN over NS (cno&tp) System is a steel stringer/multi-beam or girder carrying Ison LN over NS (cno&tp) System in Mercer County, Kentucky. It was built in 1940, so it is 85 years old, older than the Kentucky average of 46.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 84 vehicles a day, projected to reach 84 by 2042. The structure is 94 ft (28.7 m) long and 18 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesIson LN
CrossesNS (cno&tp) System
Location.1 MI W of JCT Ky 342
RouteCounty Highway 1123
CountyMercer County
StateKentucky
Coordinates37.76861, -84.74139
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating13.6 US tons
Inventory rating7.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans5
Design loadUnknown
Structure length94 ft (28.7 m)
Longest span37 ft (11.3 m)
Deck width18 ft (5.6 m)
Roadway width15 ft (4.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic84 (2022)
Projected traffic84 by 2042
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerRailroad
Maintained byRailroad
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$228,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Ison LN over NS (cno&tp) System built?

It was built in 1940, making it 85 years old in 2025.

What condition is Ison LN over NS (cno&tp) System 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 July 2024.

How much traffic does Ison LN over NS (cno&tp) System carry?

About 84 vehicles per day (2022 count).

How long is Ison LN over NS (cno&tp) System?

The structure is 94 ft (28.7 m) long with a longest span of 37 ft (11.3 m) and a deck 18 ft wide.

Who owns Ison LN over NS (cno&tp) System?

It is owned by the Railroad.