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• Board Meeting Date: 7/11/2007
• Description: CF Section- New Project Loans - Henrylyn Irrigation District - Horse Creek Reservoir and Prospect Reservoir Rehabilitation
• Board Meetings - Doc Type: Memo

Water Project Construction Loan Program - Project Data

Borrower: Henrylyn Irrigation District

County: Weld

Project Name: Horse Creek & Prospect
Reservoirs

Project Type: Reservoir Rehabilitation

Drainage Basin: South Platte

Water Source: Denver- Hudson Canal

Total Project Cost: $2,403,000

Funding Sources: CWCB, HID

Type of Borrower: Agricultural

Aver. Delivery: 13,850 acre-feet

CWCB Construction Fund Loan: $2,184,327 Interest Rate: 2,25% Term: 30 years
(incl. 1 % loan fee)

The HID was formed in 1907 Irrigation District Law of 1905, and consists of 32,745 acres of
irrigated farm land in Weld County, The service area starts about 2 miles west of Hudson and
extends generally east and south along 1-76, to about 9 miles east of Keenesburg. The HID
diverts water through the Burlington Canal Headworks on the South Platte River, extending 16
miles to and past Barr Lake, From Barr Lake the Denver-Hudson Canal continues 25 miles to
Horse Creek Reservoir, and then continues another 25 miles to Prospect Reservoir. Annual HID
delivery is 19,175 AF. Horse Creek Reservoir was constructed in 1910, and is a High Hazard,
Class 1 earth fill dam, with a dam height of 64 feet, a length of 4800 lineal feet, and a crest width of
16 feet. There is a 200 foot wide earth-lined spillway. The decreed storage right is 19,515 AF, but
normal storage is 18,747 acre feet. The outlet works consist of 3 x 48" diameter steel conduits.
The proposed project will provide a lining for the outlet works, install additional toe drainage, and
resurface and re-grade the dam crest. Prospect Reservoir was constructed in 1914, and is a
Significant Hazard, Class 2 earth dam, with a dam height of 43.5 feet, a length of 5,301 lineal feet,
and a crest width of 20 feet. There is a 250 wide concrete and riprap spillway. The decreed
storage right if for 7,660 AF, but the normal storage is 6,368 acre feet. The outlet works consist of a
48" concrete pipe that narrows to about 30" downstream of the control gate, due to previous re-
lining projects. The reservoir is currently restricted to 1.5 feet below the historic maximum stage,
due to concerns about the stability of the downstream slope of the dam. The proposed project will
provide a lining for the outlet works, and resurface and re-grade the dam crest.

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Location Map

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