FLOODS OF 2011

• Floodwaters of the Musselshell River have forced the evacuation of 30 homes in Roundup and the closure of Highway 87 between Roundup and Billings.
• ​​The 2011 flooding on the Musselshell River in Montana began about May 21, affecting large parts of central Montana. At Mosby, Montana, the river crested at 16 feet on Monday, May 23. The flood level at Mosby is 8 feet  and the record crest at that point along the Musselshell is 17.7 feet, set in 1993. The flooding was caused by up to 8 inches  of rain combined with snow-melt.​​
• The town of Roundup suffered the most damage of any community along the Musselshell. Potable water, food, and medicine were major concerns. Flood waters along the Musselshell near Roundup were as much as 6 feet deep,cresting over the weekend. Flooding near Roundup was at least 2 feet  above record flood level and forced the evacuation of dozens of homes. On Thursday, May 26 the flooding inundated portions of Roundup, At Highway 87 the floodwaters were flowing at over 3,670 cu ft/s , more than 10 times the normal rate.