SPDSS_Task5_KeyStructure_NewCacheLaPoudre

• Title: SPDSS Task 5 - Key Structure, New Cache la Poudre Irrigating Company and Cache la Poudre Reservoir Company
• Description: The New Cache la Poudre Irrigating Company and Cache la Poudre Reservoir Company 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: 3/5/2005
• 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

End-of--month contents
• Generally complete record (see Figure 2) except for data missing in water years 1950,
1951, and 1969 and sporadic months over the period of record.
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Figure 2: Timnath Reservoir Storage Records
As shown on Figure 2, Timnath Reservoir fills in most years. During periods of drought, such as
during the early- to mid-195O's, the mid-197O's and in 2002 Timnath Reservoir does not
typically fill to maximum capacity. In 1977, Timnath dam was rebuilt to comply with dam
safety regulations. During reservoir reconstruction, no water was stored in the reservoir.
2) Greeley No 2 Ditch (Structure ID 0300929)
The headgate of the Greeley No. 2 Ditch (aka New Cache la Poudre Company Ditch) is located
on the north side of the Cache la Poudre River approximately 2 miles southeast of the Town of
Timnath. The earth-lined ditch diverts direct flow water from the Cache la Poudre River and
conveys storage water released to the ditch through Timnath Reservoir Outlet Canal.
As the Greeley No. 2 Ditch travels in an easterly direction into Weld County, generally
paralleling the Cache la Poudre River, it intercepts return flows from the Larimer and Weld
Irrigation District to the north through Law Drainage, Willow Creek, Eaton Draw, Owl Creek,
Sand Creek, and various pipes carrying return flows from irrigated lands to the north. The ditch
also crosses over Graham Seep, Lone Tree Creek, and Crow Creek; however, no return flows are
intercepted at these locations.
Direct flow water in Greeley No. 2 Ditch is used predominantly for irrigation of lands under the
New Cache System. Greeley No. 2 direct flow water has also been used for augmentation under
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