Beginning on June 9, the Clairton Municipal Authority will excavate a trench across the Montour Trail near the Clairton trailhead to install a drain pipe. There will be a detour on the grass around the excavation. Trail users should use caution, as there will be power equipment at the site and an open trench for several days. The detour may be in place for several weeks, even after the trench is filled in.