BOARD00031 ‎(2)‎

• Board Meeting Date: 9/20/2006
• Description: CWCB Director's Report
• Board Meetings - Doc Type: Memo

Authorization: Severance Tax Fund
Water Source: South Platte River
Terms of Loan: $337,095@2.35% for 20 yrs.

County: Morgan/Logan/Wash.
Project Yield: 32,300 AF
Project Type: Spillway Construction

LID was formed in 1910 and operates under the Irrigation District Law of 1905, levying an acreage
assessment to its members. The reservoir provides supplemental irrigation water for approximately 28,000
acres, well augmentation, and recreation. Average annual diversions to the reservoir are 40,160 acre feet,
and average annual delivery to landowners is approximately 18,400 acre feet. The reservoir is an off-
stream reservoir constructed in 1910-12. The dam is a Medium Size, Class 1 Dam, with a height of36
feet at GH 35.5, and a length of 3.5 miles. Maximum storage is 32,300 acre feet (GH 28.0), but the
reservoir is currently restricted to 28,600 acre feet (GH 26.5). The lake has a surface area of2300 acres at
the restricted level. The outlet works is located in the NW corner of the reservoir, and a low depression in
the SW corner operates as a natural open-channel emergency spillway. The proposed emergency pipe
spillway will address SEO dam safety concerns. The project will construct an emergency spillway to
provide unrestricted overflow to pass the 75% PMP, without overtopping the dam. Construction will
include a 250 foot long, 72-inch RCP spillway with an overflow structure upstream of the dam, an energy
dissipation structure at the terminal end of the pipe, and a short channel to the Prewitt outlet canal.
Project is anticipated to commence construction in October of 2006.

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