Channel Response Assessment for the Upper Blackfoot

摘要

This report presents research activities and results for a study performed on Mike Horse Dam (MHD) and nearby streams and watersheds in Western Montana. Streams included in the study were Mike Horse Creek, Beartrap Creek, Anaconda Creek, and the Upper Blackfoot River. The study began with field data collection in 2007. Data collection continued through 2008. Data analyses and report preparation were completed in 2009 and 2010. The purpose of the research was to investigate the response of vegetation, stream channels, and watershed characteristics to pre-dam mining activities, dam construction (erected in 1941), dam operation, dam failure flood (breach) event in 1975, and the post-breach period. Reclamation activities, largely focusing on removal of contaminated soils and sediments, are currently underway at the dam and in adversely affected stream channels and are anticipated to continue for at least the next decade.