SPDSS_Task5_KeyMuniUser_Longmont

• Title: SPDSS Task 5 - Key Structure, City of Longmont
• Description: The City of Longmont has been identified as a key municipal user for the South Platte Decision Support System ‎(SPDSS)‎ consumptive use and surface water modeling efforts. The purpose of this Task 5 memorandum is to document physical, legal, and operational aspects of those key structures identified.
• Decision Support - Doc Type: Task Memorandum
• Date: 3/2/2005
• DSS Category: Surface Water
• DSS: South Platte
• Basin: South Platte
• Contract/PO #: C153954
• Grant Type: Non-Reimbursable
• Bill Number: SB01-157, HB02-1152, SB03-110, HB04-1221, SB05-084, HB06-1313, SB07-122
• Prepared By: Leonard Rice Engineering

Figure 3
Button Rock Reservoir End-Of-Month Contents
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4) Union Reservoir (Structure ID 0503905)
Union Reservoir is an off-channel
reservoir located near the eastern
end of the City and filled by the
Oligarchy Ditch, which diverts
from St. Vrain Creek. In 1986, the
City purchased 50 percent share ~
ownership in Union Reservoir and °=~w "`,`~'__ f`#=~~ ~' _~ ``
has acquired another 35 percent _ ._-_. _ _ ~
_ _ -
through water right dedications, - - - - _ _ ~ _-- _ - -
for a total of 85 percent ~ ~-s- -~ ~_ ~_ -~~ __ ._.~--
ownership. The Union Reservoir ~~`"`- ~~~`~ ~ `~`r`
Figure 4 -Union Reservoir
Company WaS hlstorlcally an http://www.coloradofisherman.com/union_reservoir_wiper_fishing.htm
irrigation company that was
operated for late-season irrigation deliveries to irrigators on the main stem South Platte River
under the Union Ditch, Bijou Ditch, and Lower Latham Ditch in the La Salle to Fort Morgan
area. Many of these irrigation ditch share holders used storage releases for augmentation of river
depletions caused by pumping wells on their farms.
The City currently uses the reservoir for replacement releases and contract deliveries. The City
has plans to enlarge the reservoir, which will increase the use of Union Reservoir in the City's
water resources system operations. The City is currently constructing pipelines to provide Union
City of Longmont Operating Memorandum.doc Page 8 of 21 March 2, 2005
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