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<br />rcquire rclocatlon of one railroad ancl the.4.1ane intcrstatehio h...av'
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<br />however. the dam would be shorter than a structure at the Pinon ~ite.
<br />Also, the project would contTol an additional 60 square miles of
<br />d::ainagearea, ltwas determined that a flood control project at this
<br />51te for standard project flood protection for the urban area of Pueblo
<br />would also yield conSiderable downstrean henefits for reduction of peak
<br />floodflows on the Arkansas River. The first cost for a 5ingle~purpose
<br />project would be 527,990,000; annual charges, $1,552,000; annual flood
<br />control beneflts. $1,580,430; benefit-cost ratio 1.02; and the e~cess
<br />benefits over costs would amount to $28,430.
<br />
<br />to share the costs under the provisions of Pucblic Law 89-72, the
<br />Federal ~ater Project Recreation Act, and to p~vidc watcr to estab-
<br />lish anJ maintain a pool of 20,000 acre-feet (about 880 surface acres).
<br />The separable costs of adding these purposes to the project, including
<br />development of recreation park facilities, would be $4,411,000. Aver-
<br />ageannualchargeswouldbe$330,000;averageannualbenefits,S845860-
<br />benefit-cost ratio, 2.6; and the excess benefits over costs would ' ,
<br />amount to $515,860.
<br />
<br />c. Following the determination of feasibility of a reservoir
<br />project ~or flood control, the addition of storage for other purposes
<br />waS consldereu. The city of Pueblo obtains its municipal and indus-
<br />trialwatersupplybydirectdiversionfrrnnthe'ArkansasRiver,trans-
<br />mountain diversion of western slope waters, storage of Clear Creek
<br />flows, and from shallow and deep wells adjacent to the Arkansas River,
<br />wlth the major portion supplied from the first two sources, The report
<br />of the Federal Water Pollution Control Administration (Appendix 1')
<br />indicates that these supplies are of good quality and will satisfy the
<br />anticipated needs through the yellr zn40. Future water supply will be
<br />supplemented by 3,000 acre-feet of water allocated annually from the
<br />Fryingpan_ArkansasProjectandpurchaseof2,500acre-feetofl10me_
<br />stake Water Development Project water annually from the city of
<br />Aurora, ColoradO. Local interests were requested to express their
<br /><lesires for municipal and industnal water supply storag'l on Fountain
<br />Creek; however, the adequacy of supply for the present and forseeable
<br />future and the overappropriation of Fountain Creek flows for other
<br />uses apparently precluded any positive response. Consequently, no
<br />further consideration was given to reservoir development for this
<br />purpose,
<br />
<br />f. In view of the favorable findings resulting from the
<br />study and in accordance with the desires of the State of Colorado,
<br />the plan for a multiple_purpose reservoir project at the College site
<br />for flood and sediment control, recreation, and fish and wildlife pur-
<br />poses waS developed in detail and designated as the fountain Reservoir
<br />Project. The plan is briefly described in the following paragraphs and
<br />more fully presented in Attachment I.
<br />
<br />d.Inviewoftheoverappropriationofwaterforirrigation
<br />usc and the limited and etratic supply, no consideration was given to
<br />reServOlr storage for lrrigation or hydroelectric power deve.opment on
<br />Fountain Creck near Pueble.
<br />
<br />14. FOUNTAIN RESERVOIR PRo..lECT.- Fountain DllIIl would be an earth-
<br />fill structure, 12,905 feet long with a CrOWn width of 20 feet, rising
<br />172 feet above streambed to elevation 4,937 feet. The storage capacity
<br />of the reservoir at spillway crest elevation would bc 247,000 acre-feet,
<br />of which 187,000 acre-feet would be allocated to flood control, 40,000
<br />acre_feet to sediment retention, and 20,000 acre-feet to recreation.
<br />'O'do~tlet works would consist of an approach channel, intake structure,
<br />con Ult, control tower, service bridge, terminal energy dissipater, and
<br />outlet channel. The outlet works also would be provided with hydraul-
<br />ically controlled vertical lift gates to regulate flows <luring flood
<br />stage and to maintain the level of the permanent recreation pool. An
<br />uncontrolled concrete ogee type service spillway would be located in
<br />the right abutment around the end of the dam. The length of the spill-
<br />way would be 2,727 feet with a notch 540 feet long and 4 feet deep
<br />l~cated in the center of the ogee section. Spillway flows would be
<br />dlrected lnto an arroyo which joins Fountain Creek about one mile
<br />below the dilIO.
<br />
<br />e. Preliminary evaluation of outdoor recreation needS fur-
<br />nished by the Bureau of Outdoor Recreation indicates that there is an
<br />acute shortage of lakes and reservoirs within reasonable proxlmity to
<br />Pueblo for water-oriented recreation. Coordination with the Bureau of
<br />Sport Fisheries and Wildlife disclosed that the existing fish habitat
<br />of Fountain Creek is poor, waterfowl use is light, and hunting oppor-
<br />tunities are very limited. During preliminary eoordinatlon of the
<br />potential flood control reservoir project with agencies of the State
<br />of Colorado, a desire was expressed by the Colorado Water Conservation
<br />Board, the Colorado Oepartment of Natural Resources, and the Colorado
<br />Division of Gume, Fish and Par~s for a permanent pool for recreetlon
<br />fish and wildlife purposes. 5uhsequently the Governor furnished a '
<br />letler of intent indieatin~ the willingness of the State of ColoradO
<br />
<br />15. CUllstru'tiu""atcrialsforthedamembankmentueavailable
<br />in unlimited quantities in the vicinity. Within the reservoir area
<br />outsi~e the active flood plain, clay, sandy clay, and silty clay
<br />materlals overlie the Pierre shale. The overburden materials and
<br />Pierre shale would provide a competent foundation for the proposed
<br />struc:ure and :upply the pervious, impervious, and drainage filter
<br />mlitenaisre'lUlredfortheembanklllent. The outlet works would be
<br />located to the west of the streambed on Pierre shale bedrock. The
<br />spillway also would be constructed on bedrock.
<br />
<br />. 16. Construction of the project would require relocation of 7.6
<br />mlles of the Denver and Rio Grande Western railroad tracks, 6.1 mlles
<br />oflnterstatel1ighwayI425, 6 miles of county roads, and 4 miles of
<br />pO~'cr lines
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