SR 386: Kitt Peak Observatory Guardrail Reconstruction Project

SR 386: Kitt Peak Observatory Guardrail Reconstruction Project



The Arizona Department of Transportation has initiated a project to repair guardrail and make other improvements on State Route 386 at the Kitt Peak Observatory on the Tohono O’odham Nation to improve roadway safety.

Project Elements

  • Replacing guardrail and guardrail end terminals
  • Constructing drainage improvement
  • Performing rock fall mitigation
  • Other miscellaneous improvements

Project Area

Map - Kitt Peak Observatory guardrail repair project

The project limits extend from the SR 386/SR 86 intersection from milepost 0 to milepost 12.

What to Expect

  • Traffic control devices will be in place to move motorists through the construction area. During non-working hours, both lanes of traffic will be open.
  • Construction is tentatively scheduled from 6 a.m. to 6 p.m. Monday through Friday. 
  • ADOT will provide advance notice of restrictions and closures to email subscribers. 

Project Schedule

Construction is scheduled to begin September 2024 with an anticipated completion date in spring 2025.

Stay Informed

  • By email: Subscribe to receive project updates and traffic alerts.
  • By phone: Call the ADOT Project Information Line at 855.712.8530.
  • Online: Submit a question or comment via email to Dulce Maria Rojo at  [email protected]
  • For real-time highway conditions statewide, follow ADOT on Twitter  (@ArizonaDOT), visit or call 511, except while driving.