BOARD01011

• Board Meeting Date: 9/24/2001
• Description: CF Section - Consolidated Home Supply Ditch and Reservoir Company
• Board Meetings - Doc Type: Memo

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Colorado Water Conservation Board
Department of Natural Resources
1313 Sherman Street, Room 721
Denver, CoJqrado 80203
Phone, [phone]
fAX, [phone]
vvww,cwcb.state.co.us

STATE OF COLORt\DO

Q

MEMORANDUM

TO:

Colorado Water Conservation Board Members

John Van Sciver, P.E,_.:1"uH~5
Mike Serlet, P.E., Chief 0) ('
Water Supply Planning !r1ctFinance Section.

Bill Owens
Governor
Greg E. Walcher
Executive Director
Rod Kuharich
CWCB Director
Dan McAuliffe
Deputy Director

FROM:

DATE: September 11,2001

SUBJECT: Agenda Item 16a., September 24-25,2001 Board Meeting
Consolidated Home Supply Ditch and Reservoir Company

Introduction
The Consolidated Home Supply Ditch and Reservoir Company (CHSDRC) is applying for a
$943,000 Emergency Loan from the Construction Fund to rehabilitate the dam on the Mariano
(Boedecker) Reservoir. The estimated total cost of the project is $1,048,000. Please see the
attached project summary and map.

Backaround
The CHSDRC, located in Larimer County, operates the Mariano Reservoir for the benefit of the
shareholders by providing direct flow and storage irrigation water to a 16,500-acre service area.
The Reservoir is located about 2.5 miles southwest of Loveland, and is filled by the George Rist
Ditch with headgate on the Big Thompson River. The dam, constructed in 1889, is a Class I
structure, 25 feet high, impounding a reservoir of 5571 ac-ft. Annual maintenance and repair has
been needed to keep the dam in operation and in compliance with State Engineer safety
standards. The downstream slope is rather steep (1.75:1), and the dam has a history of seepage
along the toe, particularly near the spillway. The outlet is a horseshoe tunnel with wooden floor,
requiring regular repair work over the years.

On June 27, 2001 a longitudinal crack was found on the downstream slope, just below the crest of
the dam. The crack was about 30 feet long and had a scarp of about 6 inches. A slight bulge was
found at the toe of the dam, below the scarp. The Company contacted their engineer, and the
State Engineer's Office, and procee.ded to lower the reservoir level.

The CHSDRC needs to rehabilitate the Mariano Dam so that it can be safely placed back in
service as soon as possible. The Company needs to store water this winter, to provide water for
irrigation in summer 2002. The CHSDRC is eligible to apply for a loan from the Emergency
Infrastructure Repair Account because "". the project is necessary to avoid unreasonable risk of
injury or damage to human. health or well-being or to property or crops, and because the
emergency condition is not the result of negligence in the operation or maintenance of the
infrastructure." Work is tentatively scheduled to be completed in fall-winter 2001.

Flood Protection. Water Project Planning and Financing. Stream and lake Protection
Water Supply Protection. Conservation Planning