SPDSS_Task5_KeyStructure_NCWCD_CBT

• Title: SPDSS Task 5 - Key Structure, Northern Colorado Water Conservancy District and Colorado-Big Thompson Project
• Description: The Northern Colorado Water Conservancy District and Colorado-Big Thompson Project has been identified as a key structure 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: 7/7/2006
• 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

Project water from Boulder Creek to the South Platte River. HydroBase data related to St. Vrain
Supply Canal are only available for 1991.
Charles Hansen Feeder Canal (Structure IDs 0400491 and 0401002)
The Charles Hansen Feeder Canal, with a 930-cfs capacity, transports water from Flatiron
Reservoir to the Big Thompson River and Horsetooth Reservoir. The canal crosses the Big
Thompson River in a siphon above the river. Water from the Big Thompson River can be
diverted into the canal at the Dille Diversion Dam and utilized for power generation at the Big
Thompson Power Plant. HydroBase data related to Charles Hansen Feeder Canal are only
available for 2 recent years.
Southern Water Supply Pipeline (No Structure ID)
The Southern Water Supply Pipeline conveys water to 12 northeastern Colorado water providers
within the District and Subdistrict boundaries. The buried pipeline extends south out of Carter
Lake to Broomfield, Louisville and Superior. It also travels east and south to Fort Lupton,
Hudson and eventually to Fort Morgan. There are no HydroBase data available related to
Southern Water Supply Pipeline.
3) Horsetooth Reservoir (Structure ID 0303732)
Horsetooth Reservoir provides drinking water to the City of Fort Collins and to numerous Water
Districts that provide potable water to areas surrounding the larger municipalities. It also
provides water for regional industries and irrigation water for farmers throughout the Cache la
Poudre River basin. Horsetooth Reservoir has a total constructed capacity of 156,700 ac-ft with a
surface area of 2,040 acres.
Construction on Horsetooth Reservoir began in 1946 and was completed in 1949. The first water
was stored in January 1951. Horsetooth Reservoir was officially dedicated July 21, 1951, when
water was first released to the Cache la Poudre River.
HydroBase Data: There are sporadic monthly data available in HydroBase over the 1950-2002
period of record pertaining to Horsetooth Reservoir. NCWCD provided monthly storage
records for this reservoir.
Elevation Capacity Data: An elevation-capacity curve for the reservoir was provided by
NCWCD. A subset of points from the curve is provided in Table 2.
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