BOARD00220

• Board Meeting Date: 9/22/2003
• Description: CWCB Director's Report
• Board Meetings - Doc Type: Memo

Water Source: Ashcroft Draw
Terms of Loan: $300,000 @4.25% for 30 years

Project Yield: 200 ac.ft.
Project Type: Dam Rehabilitation

eLake Arrowhead Reservoir is located 2 miles southwest of Greeley on Ashcroft Draw, which is a tributary to the South
Platte River. The existing Class 3 dam, 30 feet high, was constructed in 1963 with a 200 acre-foot capacity. On August
10,2002 a large sinkhole developed on the downstream slope of the dam, due to failure of the outlet pipe. The Water
Association has retained the services of Boyle Engineering to complete the remaining design work. Construction is
scheduled to commence by the fall of 2003.

3. Pine River - Bavfield Ditch Companv - Siphon Replacement Proiect
Authorization: Construction Fund County: La Plata
Water Source: Vallecito Reservoir Project Yield: 8,866 ac.ft.
Terms of Loan: $267,000 @2.75% for 30 years Project Type: Siphon Replacement

PRBDC provides irrigation water to a 2,596-acre service area in La Plata County, generally south of the Town of
Bayfield. The Pine River Bayfield Ditch is a lateral extending off of the Schroder Ditch and is a carrier ditch for
shareholders owning Pine River water rights and Pine River Irrigation District water shares (Vallecito Reservoir).
The PRBDC headgate is located east of the Town ofBayfield, above Beaver Creek. From the headgate, the ditch
flows through a concrete flume and into the Beaver Creek siphon, a 32-inch diameter steel pipe siphon, 2300 feet in
length, dropping an estimated 100 feet in elevation, as it runs under Beaver Creek. The current siphon was built in
1955-1957, with a design life of 30 years, and is in deteriorated condition. The steel has oxidized to the point
where the pipe walls have thinned in many places beyond repair. A new 30-inch PVC pipe, designed by the
Durango NRCS Office to carry 37 cfs, will replace the existing siphon. The design is anticipated to be complete
by August of 2003. Construction will follow in October 2003 and by complete by April of 2004.

4. Willow Heights Irrigation Companv - Dual Water Svstem
Authorization: Construction Fund County: Delta
ewater Source: Leroux Creek . Project Yield: 257 ac.ft.
Terms of Loan: $115,000 @3.75% for 30 years Project Type: Dual Water System

WBIC owns and operates an existing piped irrigation system located in the Willow Heights Subdivision and Duke
Hill community in the Town of Hotchkiss. The system was constructed in 1976, and water is obtained through the
Duke Ditch, which diverts water from Leroux Creek. Water is supplied to about 95 residential lots and a Town
park. The total irrigated area is about 60 acres, and primarily use is to irrigate lawns and gardens. The system
consists of a headgate, approximately 6000 lineal feet of main distribution piping (10", 8" and 6"), and
approximately 3000 feet oflateral piping. The original piping was a lightweight plastic pipe, and improper
backfilling resulted in crushed pipes in some areas, and significant plugging problems. As a result of the blockages,
and reduced flow due to mineral deposits, the overall flow capacity is less than 1/3 of the original. The project
involves installing all new distribution lines and lateral tap lines, along with cleanouts and isolation valves. The
new pipes will be installed over the top ofthe existing system but at a standard depth of22 - 30". The piping will
be heavier PVC, located above the existing pipe, but offset several feet to eliminate sewer manhole conflicts.
Design is anticipated to be complete by August of2003 with construction to follow in October of 2003.

5. Larimer County - Drv Creek Multi-Obiective Floodplain Proiect.
Authorization: SB 96-152, Amended SB 97-8 County: Larimer - N. of Ft. Collins
Water Source: Dry Creek Basin Project Yield: N/A
Terms of Loan: $920,000 @4.25% for 30-years Project Type: Flood Mitigation

Dry Creek is located north of Fort Collins, with a majority of its 75 square miles of drainage basin area located
within Larimer County. The uppermost portion of the basin consists of range land and irrigated pastures. The
lower portion of the basin within the city limits of Fort Collins consists of commercial, industrial, and residential
_development. Over the years the lower 2/3 of the Dry Creek floodplain corridor has almost been completely
~liminated due to development. The 100-year runoff for Dry Creek is 5,022 cfs. The intent of the project is to
control floodwaters in the upper basin area by means of detention facilities to reduce the peak discharge from 5022