Rock Excavation Work at Monroe and Summit

Monroe will have periodic minor delays

Julie Happy, 509.625.7773, jhappy@spokanecity.org


Thursday, May 5, 2016 at 8:44 a.m.


Due to the presence of hard rock in the Combined Sewer Overflow project construction site near Monroe and Post Street, strategic rock excavation (controlled blasting) will begin Monday, May 9 and last for approximately two to four weeks. Due to the nature of this work, cars and pedestrians will be stopped from entering near the excavation location for up to 10 minutes.

Spokane Traffic Control will be on hand with flaggers to control car and pedestrian traffic to clear the “blasting zone” for safety. Signage and traffic control devices will be going up to alert drivers about the upcoming work.

Before the controlled blasting begins, there will be a series of whistles as follows:

  • Five (5) long air horn signals to indicate five (5) minutes until the blast
  • 10 short air horn signals to indicate one (1) minute until the blast
  • Then the blast occurs
  • One (1) long air horn signals to indicate that the area is clear

It is anticipated that there will not be any notable vibrations that will occur as a result of the blasting. Due to the drilling work for the rock excavation, it is anticipated that the noise level may be slightly higher than normal in the area.

This $5.9 million dollar project includes construction of a Combined Sewer Overflow Tank (CSO) tank and the necessary piping for our Cleaner River Faster Program.