C150253 Feasibility Study

• Contract/PO #: C150253
• Contractor Name: Lower Latham Reservoir Company
• Contract Type: Loan
• Water District: 64
• County: Weld
• Loan Projects - Doc Type: Feasibility Study

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In addition to the LLRC, two other Lower Latham Companies, the LLDC and the Lower Latham
Asset Management Company (LLAMC), are integral to the operation of the plan for augmentation.
The LLDC provides a means for delivering the LLRC water supplies to the various shareholders
under the Latham irrigation system. In addition, the use of the Lower Latham Ditch, which is owned
by LLDC, is necessary for the operation of the plan for augmentation for making physical water
deliveries. Requirements for eligibility in the LLRC plan for augmentation include the need for the
well owner to own either LLRC or LLDC stock. The Lower Latham Asset Management Company
was established in January 2004 for purposes of managing and administering the Lower Latham Plan
for Augmentation.

III. PROJECT SERVICE AREA

LLRC and LLDC jointly provide irrigation water to a service area of approximately 11,000 acres in .
Weld County. The Lower Latham Reservoir is filled through the Union Ditch under a carriage
agreement ~ith the Union Ditch Company. The Lower Latham Ditch headgate is located on the
South Platte River in Section 31, Township 5N, Range 65W. The ditch conveys direct flow water
from the river and storage water from Lower Latham Reservoir. Figure 1 shows the general service
area of the Lower Latham Ditch.

III. WELL PUMPING AND REPLACEMENT OBLIGA nONS

There are a total of 85 active wells within the 2007 Lower Latham SWSP. All wells within the
SWSP and plan for augmentation are utilized exclusively or irrigation purposes. In recent years, the
GMSCCWCD plan for augmentation has not provided adequate replacement water supplies to
provide for un-curtailed pumping of its membership wells. The Lower Latham SWSP has provided a
means for adequate replacement water so that curtailment of pumping is not required. A copy of the
2007 Lower Latham SWSP renewal request is enclosed in Appendix C. Within the SWSP, the wells
depletions are determined using a water budget methodology which determines the total stream
replacement obligation to be 586.6 acre-feet during the 2007 plan year (April 2007 through March
2008), allocated 236.5 to GMSCCWCD membership wells and 350.1 acre-feet to non-GMSCCWCD
wells.

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