KY 237 (Gunpowder Road) Widening

Project Information

Facility: KY 237 (Gunpowder Road)

Location: KY US 42 to KY 536 (Mount Zion Road)

Project Type: Roadway Widening/Relocation/New Facility

Priority Level: Tier 1

Project Description:

  • Widen KY 237 (Gunpowder Road) from KY 536 (Mount Zion Road) to US 42 to improve safety and mobility through central Boone County.
  • Install a multi-use path along the improved roadway.

Cost Estimate:

Design Utilities Right of Way Construction TOTAL
$900,000 $580,000 $3,030,000 $6,570,000 $11,080,000


  • Reconstruction of KY 237 (Gunpowder Road) will eliminate the geometric deficiencies along the roadway and improve safety.
  • Improvements to this portion of KY 237 will complete a series of continuous improvements to the route from KY 536 to Hebron.
  • This project will improve mobility by providing a safe and reliable alternative to US 42 and KY 536 (Mount Zion Road).
  • The project will reduce the frequency of flooding along the roadway.
  • A multi-use trail would provide a continuous connection to commercial development, schools and parks with a scenic view of Gunpowder Creek. This project is consistent with Boone County’s overall goal of improved safety and connectivity for bicycles and pedestrians.  Click HERE for a map of multi-use paths in Boone County.


  • The project will require additional right of way.
  • The project will need to avoid or mitigate impacts to Gunpowder Creek and potential historic properties.

Existing Conditions

Functional Classification: Major Collector

Existing ADT: 4,450 vehicles per day

2040 Forecasted ADT: 3,900 vehicles per day

Truck Volume: 9%


  • KY 237 serves as a primary north-south route through central Boone County.
  • As housing development in the Union area continues to expand, traffic is expected to increase along this roadway.

Land Use/Socio-Economic/Environmental:

  • The land use adjacent to KY 237 is primarily rural density housing and churches. The 2040 land use map shows that future suburban density housing is expected in this area.
  • Gunpowder Creek runs along the west side of the roadway.
  • Potential historic sites on the National Register of Historic Properties were identified within the project area.


  • The crash rate along this portion of roadway is over three times the statewide average for similar roadways.
  • There are existing geometric deficiencies along the route such as sharp curves, narrow lanes, and narrow shoulders. The existing cross section is not consistent with the use of the roadway.


  • The roadway is listed in OKI’s Bicycle Route Guide as “not recommended.”
  • Future expansion of suburban density will increase resident demand for dedicated bicycle and pedestrian facilities along the roadway.
  • Both the north and south project limits connect to multi-use paths.