The City of Greeley, Colorado (Greeley), proposes to expand its existing Milton Seaman Reservoir, located on the North Fork Cache la Poudre River, to provide additional municipal and industrial water supplies.

In 2006, the U.S. Army Corps of Engineers, Omaha District, Regulatory Branch (USACE) began preparing a combined Environmental Impact Statement for the Seaman Water Supply Project and the City of Fort Collins' (Fort Collins) proposed expansion of Halligan Reservoir which is also on the North Fork of the Cache la Poudre River. Several contributing factors including differing study schedules led Fort Collins and Greeley to request that the two projects be separated and independently evaluated. USACE carefully considered the request and on January 15, 2015, determined that it is appropriate and in the best interest of all involved to independently evaluate them as two separate projects.

Greeley originally proposed to expand Milton Seaman Reservoir from 5,000 to 53,000 acre-feet to provide additional system firm yield of approximately 6,600 acre-feet per year in order to satisfy a portion of their projected 2050 municipal and industrial water demands.  However, in 2017 Greeley's water supplies and demands were reviewed and revised and show that in 2065 Greeley's projected water demands will exceed their projected supplies by 12,125 acre-feet. Greeley now proposes to expand Milton Seaman Reservoir to a total capacity of 88,000 acre-feet to provide additional system firm yield of 12,125 acre-feet per year to meet their full 2065 municipal and industrial demand.

USACE is currently identifying reasonable and practicable alternatives to Greeley's proposed project that will then be evaluated in a Draft EIS.