BOARD01663

• Board Meeting Date: 8/6/1969
• Description: Agenda or Table of Contents, Minutes, Memos
• Board Meetings - Doc Type: Meeting

extensive flood damages would result.
Although such a spill would be an ex-
tremely rare occurrence, its possibility
must be eliminated.

To eliminate spillway flows from
Cherry Creek reservoir into the Sand Creek I
basin. the report recommends the modifica-
tion of the existing Cherry Creek Dam and
Reservoir, the construction of the author-
ized Castlewood Dam and Reservoir, and the '
improvement of the Cherry Creek channel
downstream from the cherry Creek Dam.

A total storage of 246,210 acre-feet
is required in the Cherry Creek basin so
that major floods need not be discharged
into the Sand Creek basin. Cherry Creek
reservoir now provides 93,250 acre-feet
of storage. An additional 87.960 acre-
feet of storage can be obtained by raising
the crest of the Cherry Creek spillway.
The modification, which would cost about
$300,000 would be the only work undertaken
at the Cherry Creek project. All other
facilities would remain as at present.

The remaining storage required in
the Cherry Creek basin can be provided by
the authorized Castlewood Dam and Reser-
voir. The Castlewood Dam and Reservoir
and the Cherry Creek Dam and Reservoir
were authorized in 1941 and the acquisi-
tion was modified in the Flood Control
Act of 1944. They were authorized as a
system but only the Cherry Creek portion
of the system was constructed. The site
of the authorized Castlewood Dam and
Reservoir is about two miles south from
Franktown. The dam would be a rockfill I~
structure about 260 feet high and 3,600
feet long.. The reservoir would have 7,000
acre-feet of sediment storage and 46.800
acre-feet of flood control storage. It
would control a drainage area of 175 square