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3) Highland Ditch Exchange Reservoir System <br />The Company operates three storage units located off the ditch system, with approximately 7,400 <br />ac-ft total active storage capacity, for supplemental irrigation supplies (see Operational <br />Information section). Two off-ditch storage units (Foothills Reservoir and McIntosh Lake) are <br />located below the Highland Ditch headgate release water to the St. Vrain for replacement of <br />diversions made, by exchange, at the Highland Ditch headgate. One off-ditch storage unit <br />(Beaver Park Reservoir) is located above the Highland Ditch headgate and is used to make <br />releases to the ditch headgate. Releases from the three off-ditch reservoirs can not be delivered <br />directly to lands irrigated under the Highland Ditch. <br />Foothills Reservoir was constructed in 1911 and 1912 on the south side of the St. Vrain River <br />and is filled by the Foothills Inlet Ditch (Structure ID 0500532). Releases from Foothills <br />Reservoir are made to the St. Vrain River above the Oligarchy Ditch headgate. McIntosh Lake <br />(aka Dawson Lake) was constructed in 1902 and is located on the north side of the St. Vrain <br />River under the Oligarchy Ditch. Releases from McIntosh Lake are made directly to the <br />Oligarchy Ditch for replacement of upstream Highland Ditch diversions of Oligarchy Ditch <br />direct flow water rights. Beaver Park Reservoir was constructed 1892 on Beaver Creek, a <br />tributary to South Fork St. Vrain Creek. <br />Foothills Reservoir (Structure ID 0504071) <br />The diversion works of the Foothills Inlet Ditch has an estimated capacity of 85 cfs and consist <br />of 4-3' gates. The ditch is unlined for the extent of its length, which has not varied over time, and <br />is in satisfactory condition. There is no irrigated land located along the inlet ditch. <br />Capacity: <br />Total Storage: 4,350 ac-ft 160 surface acres 27-ft. average depth <br />Currently not restricted although restricted to elevation of 41 feet for <br />last ten years or so <br />Active Storage: 3,700 ac-ft <br />Dead Storage: 650 ac-ft <br />Area/Capacity Data: Reservoir gage height and cumulative capacity information are shown in <br />Table 4. Table 4 <br />Foothills Reservoir <br />Elevation -Capacity <br />Gauge Capacity <br />(ft) (Ac-Ft) <br />0 0 <br />4 44.4 <br />8 146.4 <br />12 299.2 <br />16 519.7 <br />20 810.0 <br />24 1163.8 <br />Gauge Capacity <br />(ft) (Ac-Ft) <br />28 1591.7 <br />32 2090.9 <br />36 2651.6 <br />40 3263.4 <br />44 3988.0 <br />45 4346.0 <br />Source: Water Commissioner <br />Note: Dead storage of 650 ac-ft at gage height 18.05 feet. <br />Highland Ditch Operating Memorandum.doc 10 of 16 February 24, 2005 <br />