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Last modified
9/26/2011 8:52:20 AM
Creation date
7/9/2008 2:08:11 PM
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Decision Support Systems
Title
SPDSS Task 5 - Key Structure, Jackson Lake & Fort Morgan Canal System
Description
The Jackson Lake & Fort Morgan Canal System 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. This memo was revised to incorporate additional storage information. Revised March 15, 2007
Decision Support - Doc Type
Task Memorandum
Date
3/15/2007
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
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SPDSS_Task5_KeyStructure_JacksonLake
Last modified:
9/26/2011 8:52:20 AM
Path:
\Decision Support Systems\DayForward
Comments:
2007 Revision
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Capacity: The capacity of the inlet canal is 400 cfs, although operationally the Company limits <br />its diversions to approximately 350 cfs to prevent possible canal damage. The capacity <br />of the inlet canal is equal to the decreed rate of diversion. <br />Measurement Device: Diversion measurements are made using a 30 foot rectangular weir <br />located approximately '/z mile downstream from the diversion structure. The <br />measurement device is maintained and rated by the state and the Water Commissioner is <br />responsible for collecting the records. <br />Conveyance Efficiency: Seepage losses from Jackson Lake Inlet have not been measured or <br />estimated. <br />Return Flow Locations: Seepage losses from Jackson Lake Inlet generally accrue to the South <br />Platte River. <br />HydroBase Data: Historic records of diversions into storage are recorded in Hydrobase under <br />the Jackson Lake Inlet structure and the Jackson Lake Reservoir structure. The diversion <br />records for both structures need to be combined resulting in a more complete diversion <br />record. Total historical diversions into storage under the reservoir and inlet structure <br />combined average approximately 35,000 acre-feet per year. Diversion records are <br />generally available in Hydrobase from 1970 through 2003. <br />2) Jackson Lake Reservoir (Structure ID 0103817) <br />This off-channel reservoir is located approximately 3 miles east of the Weld -Morgan county <br />line on the north side of the South Platte River. The reservoir is situated due north of the Town <br />of Goodrich and approximately 17 miles west of the City of Fort Morgan. The reservoir was <br />completed around 1907 and is used as a supplemental irrigation supply and for recreation. <br />Jackson Lake Reservoir is impounded by <br />a single earthen embankment located on <br />the south and southeast sides of the <br />reservoir. Original construction consisted <br />of an earthen embankment with possible <br />riprap slope protection (W.W Wheeler, <br />2000). In 1907, the embankment slope <br />was flattened and raised to its current <br />height and provided with reinforced <br />concrete slabs for protection. Additional <br />concrete slabs were placed in 1912 and <br />1914. Major improvements to the <br />upstream concrete facing were made in <br />2002 using a soil cement overlay. <br />Jackson Lake Reservoir has two separate <br />earthen spillways on the east side of the <br />reservoir. <br />- - . t x -_ <br />_ - <br />-_ _ _ - <br />- ~ _- _ <br />__ -_ <br />y <br />Jackson Lake Reservoir System Page 6 of 14 <br />Sunrise at.Iackson Lake <br />
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