WSP03901

• File Number: 8446
• Description: Cache La Poudre Platte Project
• State: CO
• Basin: South Platte
• Water Division: 1
• Date: 11/1/1962
• Author: BOR, DoI
• Title: Reconnaissance Report, cache La Poudre Unit, Colorado Peak Division, Missouri
• Water Supply Pro - Doc Type: Report/Study

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reservoirs. The total of' such unappropriated surplus flows was ~C"I ,',)J
estimated to be 27,800 acre-feet per year, the historic surplus "; "i",
plus the additional surplus created by increased return flows ~- ~7"':v ~<:,'E
from Fort COllins. Evaporation from the unit reservoirs--l,lOO "
acre-feet per--year from Idylwilde and 3,200 acre-feet per year from
Grey Mountain--wouJ.d be charged to the stored surplus flows. Storage
of surplus flows at the end of the study period was 19,000 acre-feet
more than at the beginning, an average annual increase of l,400 acre-
feet. The future additional municipal demand of 16,000 acre-feet per
year wouJ.d be released from the stored surplus and a release of 6,100
acre-feet per year wouJ.d be made for irrigation use. Utilization of
the unappropriated surplus is summarized below:

Historic surplus stored
Addi tiona.l surplus stored due to increased
Fort Collins return flow
Total surplus stored in unit reservoirs
Less Unit reservoir evaporation
Less annual increase in storage
Total release of surplus from Grey
Mountain Reservoir

24,500 af /yr

3,300 af~yr ""'
27,800 af yr
4,300 af!yr
1,400 af!yr

22,lOO af/yr

l6,000 af'/yr
6,lOO af!yr

y

Released for municipal use
Released for irrigation use

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Municipal Water Su1?P:Jvr

The cities of Fort Collins and Greeley divert water supplies
from the Cache la Poudre River. The Greeley water system also
provides supplies for a number of sma.ller communities in the area.
Water rights presently owned by the two cities are listed below:

Direct flOlf rights
Storage rights
CBT units
I'resent annual use of
water (approximate)

Fort Collins
20.0 cfs Y

Greeley

l2.5 cfs ?J
over 10,000 af
15,000

lO,OOO af/yr

- - -

6,000
7,000 af/yr

Y. 5.0 cfs limited to April 1.5 to October 15 period.
W In addition, Greeley mms two small transmountain
diversion systems, Bob Creek and Columbine Ditches.

The hydrology studies considered supplementing the cities t
supplies to meet expected demands in the year 2000. By the year

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