PROJ00026

• Contract/PO #: C153412
• Contractor Name: Louisville, City of
• Contract Type: Loan
• Water District: 6
• County: Boulder
• Bill Number: HB 83-1102
• Loan Projects - Doc Type: Feasibility Study

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line. The maximum water surface would cover approximately 11.5 acres. A site
plan and embankment details are shown on Figure 5.
The bottom and sides of the gravel pit would have to be completely lined
with an impermeable clay material since the reservoir site is underlain by the
permeable Fox Hills formation. (See Appendix F) Geological investigations
indicate that the proposed lake bottom would be at an elevation of 5601 feet
with the normal high water line at elevation 5610 feet and the embankment crest
at elevation 5613. Due to the surface area and embankment height of this configuration,
it can be precluded from review by the State.
Approximately 23 acre-feet could be transferred by gravity from the Gravel
Pit to Louisville Reservoir with the remaining 76 acre-feet requiring pumping
for the total utilization of the stored water.
3. Harper Lake - Alternate I - Alternate I is basically the same as Alternate
D as described in the Reservoir Site Study completed by Rocky Mountain Consultants,
Inc., in 1981. The reservoir would provide approximately 704 acre-feet of water
storage with an average depth of 18 feet.. Maximum water surface area would be
about 41 acres.
The proposed lake bottom would be at elevation 5592 feet with the high
waterline at elevation 5610 feet and the top of the embankment at 5615, providing
the 5 feet of freeboard required by the office of the State Engineer. The
embankment would completely encircle the reservoir with a minimum height of
5 feet. Due to the size of the surface area and the height of the embankment,
the State Engineer's review and approval would be required prior to construction.
A site plan with typical embankment cross sections is shown in Figure 6.
Approximately 82 acre-feet could be transferred by gravity to Louisville

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