The Idaho Transportation Department (ITD) will close State Highway 21 (SH-21) from Grandjean to Banner Summit today at 1 p.m. due to rising avalanche risk.According to the Sawtooth Avalanche Center, the Banner Summit area is cur rently under a high avalanche danger advisory and "large natural avalanches are likely."Today, the Banner Summit area is expected to receive between 5 and 18 inches of new snow, which will add a significant load atop an already weak snowpack.Please check Idaho 511 for updates on the road closure. ...read more read less