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-' m n 32538 US Army Corps of Engineers Public Notice Sacramento District 1325 J Street Sacramento, CA 95814-2922 Public Notice Number: 200375243 Date: November 7,2003 Comments Due: December 8, 2003 In reply, please refer to the Public Notice Number TO WHOM IT MAY CONCERN: SUBJECT: Application for a Department of the Army pennit under authority of Section 404 of the Clean Waler Acl (CW A) and for waler quality certificalion under Seclion 40 I of the CW A to discharge fill and dredged material within Long Hollow Creek and Government Draw, as shown in the attached drawmgs. APPLICANT: La Plata Water Conservancy District Attn: Mr. Brice Lee 940 C.R, 119 Hesperus, CO 81326- LOCATION: The project is located at Ihe confluence of Long Hollow Creek and Government Draw, south of Red Mesa, La Plata County, Colorado (Seclions 29, 32, and 33, Township 33 North, Range 13 West) PURPOSE: The applicant's purpose for the proposed project is to satisfy the 1922 La Plata River Compact between the states of Colorado and New Mexico, PROJECT DESCRIPTION: The La Plata Water Conservancy District (LPWCD) has applied for a Deparlment of the Army permit to construct an on-channel reservoir in Long Hollow, a tributary to the La Plata River. This facilily would allow Colorado to deliver water to New Mexico, as stated in the 1922 La Plata River Compact. The dam embankment would be located approximately 0,5 mile upstream of the confluence of Long Hollow and the La Plata River, approximately 4 miles upstream of the Colorado,New Mexico slate line (see Figure I), The facllity will capture flows from 43 square miles of the Long Hollow and Govemment Draw watersheds. The intent is to capture perennial flows supplied by groundwater irrigation relurn flows from and precipitation on Red Mesa, The dam embankment will be constructed from on-site materials, The dam embankmenlls shown in Figure 4, The embankment cross-section is shown in Figure 2. As proposed, Long Hollow Reservoir would have a maximum pool of 5,432 acre-feet (AF), inundate approximately 160 acres, and extend 3.5 miles upslream. The reservoir pool will fluctuate dramatically from year to year and season to season. The reservoir is expected to reach capacity about 50 percent of the time, Most years, the reservoir will be drained entirely between April and July to help meet Colorado's Compact obligation. Some years, there will be carry-over storage of500 to 2,500 AF. The LPWCD will operate the reservoir. The reservoir typically will store water during non-Compact times (December 1st - February 15th) and other periods when water rights for the reservoir are in,priority,