2023 Microseal

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This project is substantially complete. 

Beginning as early as June, crews will be working overnight to apply a microseal overlay on various streets in Downtown Boise. The microseal process involves cleaning the existing asphalt and then applying a fast-drying asphalt-based sealant. Roadways are microsealed to protect them from water and weather damage, so they stay in good condition. Construction is anticipated to end in late October.* This project also includes reallocating travel lane and bike lane facilities and installing vertical elements in bike lane buffer spaces along select portions of 15th and 16th Streets.

Road segments

  • Idaho Street, 16th Street to Broadway Avenue
  • 16th Street, Front Street to State Street
  • Bannock Street, 16th Street to 15th Street
  • Bannock Street, 9th Street to 2nd Street
  • 15th Street, Front Street to State Street

What to expect during microseal

  • All microseal work will occur at night (8 p.m. to 5 a.m.)
  • Through traffic and on-street parking will be restricted at night while crews are microsealing each road
  • Access will be maintained for businesses, hotels, and residents
  • Flaggers and signage will direct traffic in the areas where crews are applying the microseal and at adjacent intersections
  • Temporary closures

Beginning as early as June, crews will be working overnight to apply a microseal overlay on various streets in Downtown Boise. The microseal process involves cleaning the existing asphalt and then applying a fast-drying asphalt-based sealant. Roadways are microsealed to protect them from water and weather damage, so they stay in good condition. Construction is anticipated to end in late October.* This project also includes reallocating travel lane and bike lane facilities and installing vertical elements in bike lane buffer spaces along select portions of 15th and 16th Streets.

Road segments

  • Idaho Street, 16th Street to Broadway Avenue
  • 16th Street, Front Street to State Street
  • Bannock Street, 16th Street to 15th Street
  • Bannock Street, 9th Street to 2nd Street
  • 15th Street, Front Street to State Street

What to expect during microseal

  • All microseal work will occur at night (8 p.m. to 5 a.m.)
  • Through traffic and on-street parking will be restricted at night while crews are microsealing each road
  • Access will be maintained for businesses, hotels, and residents
  • Flaggers and signage will direct traffic in the areas where crews are applying the microseal and at adjacent intersections
  • Temporary closures

This project is substantially complete. 

  • December 8, 2023

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    This project is substantially complete.

  • October 20, 2023

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    • Microseal complete - striping mostly complete. Thermo installation is ongoing.
    • Additional areas added to start at a later date:
      • Federal Way - Waiting for temperatures to return.
      • Vista - Waiting for temperatures to return.
      • Shoreline Drive - Bikeway symbols installed.

  • October 12, 2023

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    • Thermo installation on-going.
    • Additional areas added to start at a later date:
      • Federal Way - Waiting for temperatures to return
      • Vista - Waiting for temperatures to return
      • Shoreline Drive - Bikeway symbols to be installed.

  • October 6, 2023

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    • Microseal complete - striping mostly complete. Thermo installation is ongoing.
    • Additional areas added to start at a later date:
    • Federal Way - Waiting for temperatures to return.
    • Vista - Waiting for temperatures to return.
    • Shoreline Drive - Complete.

  • September 22, 2023

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    • Microseal complete. Striping mostly complete. Thermo installation is ongoing.
    • Additional areas added to start at a later date include: Federal Way - waiting for temperatures to return, Vista - waiting for temperatures to return, Shoreline Drive - Complete.

  • September 15, 2023

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    • Microseal complete. Striping mostly complete. Thermo installation is ongoing.
    • Additional areas added to start at a later date:
      • Federal Way - pending approved TTC from ITD
      • Vista - pending approved TTC from ITD
      • Shoreline Drive - Complete

  • August 31, 2023

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    Microseal complete - striping mostly complete. Thermo started this week at the crossings.

    • Shoreline drive - complete
    • Federal Way - pending approved TTC from ITD
    • Vista - pending approved TTC from ITD

  • August 25, 2023

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    • Additional areas added to start at a later date for microseal -
      • Federal Way - Pending
      • Vista - Pending
      • Shoreline Drive - Lane line removal is complete. Microseal, paint and thermo is scheduled for next week.

  • August 18, 2023

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    • Microseal complete - striping mostly complete.
    • Additional areas added to start at a later date - Federal way, pending - Vista, pending
    • Shoreline Drive, Lane removal complete, Microseal paint, and thermo is scheduled for next week.

  • August 11, 2023

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    • Microseal complete - striping mostly complete.
    • Additional areas added to start at a later date: Federal Way - Pending, Vista - Pending, Shoreline Drive - Lane line removal is complete. Microseal, paint, and thermo is scheduled for next week.