Debris Flow in Ada County, Idaho

Following the debris flow that impacted the community at the bottom of Highland Valley, the half of the flow that entered the canal followed the canal into another community near Barber. The flow was so high it crested a canal culvert and began flowing down streets of the suburban community. Multiple inches of silt were built up in the neighborhood, with debris at every turn along the way. Triggering a fast response clean up to reopen the neighborhood.

Monsoonal moisture surged into the region over a three day period, the most intense of which was the 26th. High atmospheric moisture content combined with weak flow in a monsoonal pattern to produce very moist storms moving very slowly. Additionally, as terrain served as the main trigger for convection, storms would train over the same spots for much longer than normal. Precipitable water was at near record levels around 1.2 inches.