BOARD02414

• Board Meeting Date: 9/25/2000
• Description: Directors' Reports
• Board Meetings - Doc Type: Memo

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7. Jackson Lake Reservoir and Irrigation Companv - Diversion Structure Rehabilitation
Authorization: HB 00-1419 County: Weld-E. of Greeley
Water Source: South Platte River Project Yield: 34,000 acre feet
Terms of Loan: $336,600 @ 4.00% for 30 yrs. Project Type: Diversion Structure

This project is the rehabilitation of the Jackson Lake Reservoir and Irrigation Company's diversion structure
on the South Platte River. The existing structure suffered severe damage in 1995 and again in 1999. when the
river cut around the south abutment. G.A.S.P. from Fort Morgan, Colorado was retained by the Ditch Company
to prepare the final design plans and specifications to construct a new 200-ft. long concrete diversion structure,
involving 100-ft. of Obermeyer pneumatic gates and 100-ft of a concrete short wall, with a 16-ft. long
downstream flat slab jump basin. The Contractor, Boone Excavating, out of Fort Morgan. Colorado,
commenced construction in late August 2000, and is anticipated to be completed by November, 2000.
8. Idaho Springs, Town of - Idaho Springs Reservoir Rehabilitation
Authorization: HB 98-1189 County: Larimer - S. of Idaho Springs
Water Source: Chicago Creek Project Yield: 230 acre feet
Terms of Loan: $955,000 @ 4.75% for lO yrs. Project Type: Reservoir Rehabilitation

In 1998 the State Engineer's Office restricted the storage height of the reservoir to be 9-ft. below the crest of
the dam. reducing the storage capacity from 230 acre-ft. to 120 acre-ft. The storage restriction was due to excessive
seepage and the poor condition of the spillway. Harrison Westem Construction, and designlbuild group out of
Denver, Colorado, was retained by the Town to design and construct the necessary improvements to restore the dam
to its original storage capacity of 230 acre-feet. The proposed improvements include. constructing a compacted
earthfillliner on the upstream slope of the reservoir and floor, construct new toe drains, raise the embankment dam
crest by 2.5-ft., place rip rap and liner protection material above the earthfillliner. spillway repairs, and fill the old
borrow pit within the reservoir. Harrison Western Construction is scheduled to commence construction by the end
of September, 2000, completing the embankment work this fall and finishing the spillway modification next year.

9. Plumb and Dailev Ditch Companv - Boulder Creek Diversion Structure Rehabilitation
Authorization: Small Project Loan County: Weld - E. of Boulder
Water Source: Boulder Creek Project Yield: 2,278 acre feet
Terms of Loan: $42,000 @ 3.75% for 20 yrs. Project Type: Diversion Structure

This project is the rehabilitation of the Plumb and Dailey Ditch Company's diversion structure on Boulder
Creek, which has deteriorated due to age to the point of replacement. The replacement structure. designed by
Natural Resources Conservation Service, Greeley Office, consists of a new 48-ft. long concrete diversion structure,
with 8 - 6'x2'raised gates, and a 25-ft. long downstream grouted rip rap spill basin. Concrete Structures, out of
Longmont. Colorado, has been awarded the construction contract and is scheduled to commence construction on
October 1.2000.

10. Highland Ditch Companv - Foothills Reservoir Dam Rehabilitation
Authorization: SB 98-1198 - Severance Tax County: Boulder - W of Longmont
Water Source: St. Vrain River Project Yield: 450 ac.ft.
Terms of Loan: $1,040.000 @ 4.0% for 30 years Project Type: Dam Rehabilitation

This project is the rehabilitation of Foothills Reservoir dam, located west of Longmont in Boulder County.
The dam has an inadequate spillway and severe seepage through the embankment and has had a storage restriction
placed on it by the State Engineer. The final design plans and specifications were prepared by Smith Geotechnical
Engineering Consultants of Fort Collins Colorado. The proposed improvements include a new spillway, a sand
filter blanket along the downstream face of the dam, a perimeter toe drain with flow measuring devices, rip rap
placement along the upstream face of the dam, and reconstructing the dam crest. The project will be awarded by the
end of September 2000, and is scheduled to commence construction in mid-October, 2000.