Spencer Dam was a run of the river hydroelectric dam on the Niobrara River in Boyd County and Holt County, Nebraska, about 5 miles southeast of Spencer. The dam was operated by the Nebraska Public Power District. Heavy precipitation during the March 2019 North American blizzard led to a failure of the dam in the early morning of 14 March, causing heavy f…Spencer Dam was a run of the river hydroelectric dam on the Niobrara River in Boyd County and Holt County, Nebraska, about 5 miles southeast of Spencer. The dam was operated by the Nebraska Public Power District. Heavy precipitation during the March 2019 North American blizzard led to a failure of the dam in the early morning of 14 March, causing heavy flooding downstream.