US Bridges

Isom DR over Rockhouse Creek

FairPosted for load

Letcher County, Kentucky · Rockhouse Crk Br N Isom · Structure no. 067C00053N

Built
1950
75 years old
Condition
Fair
inspected May 2024
Type
Tee Beam
Concrete
Length
88 ft
2 main spans
Daily traffic
523
2009 count
Owner
County
County Highway Agency

About this bridge

Isom DR over Rockhouse Creek is a concrete tee beam carrying Isom DR over Rockhouse Creek in Letcher County, Kentucky. It was built in 1950, so it is 75 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 523 vehicles a day, projected to reach 523 by 2029. The structure is 88 ft (26.8 m) long and 23 ft wide.

Location

Open in Google Maps
CarriesIsom DR
CrossesRockhouse Creek
LocationRockhouse Crk Br N Isom
RouteCounty Highway 1798
CountyLetcher County
StateKentucky
Coordinates37.18778, -82.89528
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30.2 US tons
Inventory rating18.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length88 ft (26.8 m)
Longest span44 ft (13.4 m)
Deck width23 ft (7 m)
Roadway width19 ft (5.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic523 (2009)
Projected traffic523 by 2029
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$230,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Isom DR over Rockhouse Creek built?

It was built in 1950, making it 75 years old in 2025.

What condition is Isom DR over Rockhouse 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 May 2024.

How much traffic does Isom DR over Rockhouse Creek carry?

About 523 vehicles per day (2009 count).

How long is Isom DR over Rockhouse Creek?

The structure is 88 ft (26.8 m) long with a longest span of 44 ft (13.4 m) and a deck 23 ft wide.

Who owns Isom DR over Rockhouse Creek?

It is owned by the County Highway Agency.