Sandy River
Marmot Dam Multimedia Gallery

Earthen coffer dam With the concrete dam removed in September 2007, attention turned to removal of the temporary earthen coffer dam built to provide dry removal of the concrete dam. Breaching was to begin after fall rains increased river flow, to help sweep the earth and silt downstream.

Bull Run Hydro: Pre-demolition Marmot Dam Marmot Dam fish ladder High runoff at Marmot Dam Bull Run Powerhouse Bull Run generator Wooden box flume Marmot Dam demolition Before the blast Marmot Dam explodes Dam explosion Dam demolition begins Demolition work Earthen dam breach Earthen coffer dam Breach begins Dam is breached Upstream view of breach Stream of water increases Water gathers force Twenty minutes after breach Videos Marmot Dam demolition ceremony (2:00) Time-lapse of concrete dam destruction (0:67) Dramatic breach of earthen dam (3:10) Time-lapse of washout (0:56)