BOARD01741

• Board Meeting Date: 6/20/1955
• Description: Minutes and Resolution
• Board Meetings - Doc Type: Meeting

1100
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The total cost of the revised project is estimated
to be $22,397,000, with a benefit-cost ration of 3.02 to
1, based on a 50 year analysis. Allocations of the
total cost are $11,872,000 (53 per cent) to irrigation,
$10,225,000 (46 per cent) to flood control, $80,000 to
recreation and $220,000 to fish and wildlife.
Relocation of ~bout 15 miles of Colorado State Highway
149 would be required. The less costly route would be
on the south side of the proposed reservoir, with an
estimated cOpt of about $2,300,000. Officials of the
D. & R. G. W. Railroad have tentatively agreed to abandon
their line from Creede to a point near South Fork under
certain conditions, the costs of which are incJuded in
project relocation costs. The V..S. Fish Cultural
Station near Creede would be relocated at a cost of.
$255,000 for replacement in kind plus $220,000 for
enlargements. Within the reservoir right-of-way there
are 1,433 acres of cultivated land and 3,844 acres of
pasture land which would need to be acquired.
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The dam would be a concrete arch jis-i"ngr about 260
feet above the stream bed. It would be p~ovided with the
two 84-inch di~meter outlets to operate when the water
surface in the reservoir is at a depth-'. of 52 feet above
the center of the outlets. For passing water at times
of lower surface elevation in the reservoir, two 72-inch
~~pes are provided as sluiceways. There will discharge
2530 cfs with a water depth-. of 17 feet above the center
of the outlets.

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A land classification was made of some 500,000 acres
in the Rio Grande Division service area. It disclosed
that in this area there are 271,040 acres presently irrigated
of which 224,340 acres are in classes 1 to 4, a~ 46,700
acres are in classes 5 and 6.

To furnish a full surface water supply for the irrigation
of 271,040 acres, the report estimates an ideal diversion
requirement of 605,300 acre-feet annually and that the
usable return flow which would result would be about
50,000 acre-feet. An analys$s was made of the depletions
which would be allowable on the Rio Grande under the
terms of the Rio Grande Compact with water supply conditions
such as existed during the period 1928 through 1951.
According to the study this allowable depletion averaged
502,000 acre-feet per year, ranging from a maximum of
more than 700,000 acre-feet to a minimum of 245,000 acre-
feet. Historically, the depletion between Del Norte and
Alamosa averaged about 88 per cent of the diversions.

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