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<br />Table 11-1 is an ecosystems chart showing
<br />the dominant vegetation, habitat, mammals,
<br />and birds of the plains, foothills, and
<br />mountains. Endangered species of the area
<br />include the blackfooted ferret and the
<br />American peregrine falcon.
<br />
<br />Llbk II-I
<br />
<br />Alpine Tundra
<br />
<br />HABITAT
<br />
<br />PLAINS
<br />5J'I<Jlal1<1, Clayl~'1ds
<br />
<br />FOOTHILLS
<br />
<br />Monlane
<br />POnu(>'o,aPine Douglas-Fir
<br />
<br />DOMINANT
<br />VEGFTATlON
<br />
<br />SJndBluegraSi
<br />Sand Oropsec<.l
<br />lillie Bh",stclll
<br />NI'L'lJI"Jndtl,tCad
<br />
<br />WestcrnWhca\'jrass Sedges
<br />LittleBluesle01 Cinquefoil
<br />Needlcandlhrr.ild
<br />
<br />Blut'G'Jma
<br />BuffalnGrass
<br />WeS1ernWhealgra~
<br />Drylarld$edge
<br />
<br />Prickly Pear CilctllS
<br />
<br />BlueGrama
<br />Mountain Mahogany
<br />PonderosaPine
<br />
<br />l;{JYOIC
<br />DV'NtCoHontail
<br />Rock Mouw
<br />
<br />Badger
<br />Coyole
<br />Ground squirrels
<br />NorthNnPock"l
<br />Goph",
<br />White-Tailed
<br />Jackralll,it
<br />
<br />Alben'sS<1ulrrel
<br />Blackllcar
<br />Colo.arloChipmunk
<br />MulllDcc,
<br />Porcupine
<br />Red Squirrel
<br />
<br />MAMMALS
<br />
<br />BIRDS
<br />
<br />CloflSwallow
<br />GOlden 1'391<:
<br />Magpie
<br />MourniflgDuve
<br />Ruto(,s.SidedTowlwc
<br />Vir!linia'sWar111e,
<br />
<br />Butco h~wks
<br />Gruat Horned Owl
<br />Horned lark
<br />Meadowlark
<br />Nlght/,awk
<br />Rock Wren
<br />Say'sPhoebe
<br />Sp~rrowHilwk
<br />VespcrSp~rrow
<br />
<br />Merriam's Tarkey
<br />Pygmy Nuthatch
<br />WesternBllIebird
<br />DownyWOOdpe<oker
<br />HalryWoodpccker
<br />MOllnlainChickadce
<br />Red.Brca.tedSapslIcker
<br />Red.Sh~jted Flickcr
<br />StBller'sj~y
<br />
<br />ROCKY MOUNTAIN
<br />Subalpine
<br />A.pen Lougepol€Pine SlJrllceFir
<br />
<br />
<br />adjacent Rocky Mountains and to the influx
<br />of industry. On the other hand, the farm
<br />population is decreasing with people moving
<br />to the cities and communities in keeping with
<br />the national trend.
<br />
<br />Sedge.
<br />Yarrow
<br />Pus.sytoes
<br />Dandeliol1
<br />Asncn
<br />
<br />June Grass
<br />King Fescue
<br />Sayebrush
<br />pyrola
<br />locoWeed
<br />lupine
<br />lodgepole Pille
<br />limber Pine
<br />
<br />Thurber Fcscue
<br />BeardedWheatqrass
<br />Kinnikinnik
<br />Red Raspberry
<br />Canad~ Butfalo-
<br />berry
<br />Vaccinlum
<br />Engelmann Spruce
<br />Subalpine Fir
<br />
<br />Tufted HairgrilSS
<br />$nowllaIlSe,d.
<br />fragc
<br />Alpine Clover
<br />Alpine Forget-
<br />Me.Not
<br />
<br />L'u.Js)'.\Iemscharl
<br />
<br />Spike Fescue
<br />Chokecherry
<br />Serviceberry
<br />Oouglils.Fir
<br />
<br />Goldan Banner
<br />
<br />_Sed~
<br />Northern Pocket
<br />Gopher
<br />Pika
<br />Yellow.Bellied
<br />Marmot
<br />m
<br />
<br />B\!~ver
<br />m
<br />
<br />M~rten
<br />RadSquirrel
<br />SllowshoeHare
<br />
<br />Block Bear
<br />Porcupina
<br />Reu$quirrel
<br />
<br />Blue Groase
<br />Tree Swallow
<br />
<br />Blue Grou5e
<br />CI~rk'~ Nutcmcker
<br />Gray-Headed Junco
<br />Pine Gro~beak
<br />Stellar's J~y
<br />
<br />Brown.Capi'ed
<br />Ro,yFinch
<br />Raven
<br />Water Pipit
<br />White-Tailed
<br />Ptarmig~n
<br />
<br />Broad.Taik>d
<br />Hummingbird
<br />Goshawk
<br />Gray Jay
<br />HairyWoodpe<;ker
<br />$teller'sJay
<br />WeslamWoodPcwe€
<br />Yellow.Bcllieu
<br />Sapsucker
<br />
<br />White.Crowncd$parrow
<br />
<br />Generally speaking, the rocks of the
<br />mountainous area are pre-Cambrian
<br />granites to granodiorites and metamorphics
<br />and large batholithic masses and Tertiary
<br />quartz manzonites to diorites that occur in
<br />stocks, dykes, and sills injected into the
<br />pre-Cambrian rocks. Rocks of the plains
<br />area are predominately sedimentary.
<br />
<br />Principal mineral resources include sand
<br />and gravel, fluorspar, limestone, sandstone,
<br />granite, quartz, mica, clays, peat, petroleum,
<br />coal, gold, gypsum, and natural gas.
<br />
<br />Population of the three-county area has
<br />increased considerably during recent years;
<br />Boulder County from 74,300 in 1960 to
<br />132,000 in 1970; Larimer County from
<br />53,300 in 1960 to 89,900 in 1970; and
<br />Weld County from 72,300 in 1960 to
<br />89,300 in 1970. Increases occurred
<br />primarily in the urban areas and suburban
<br />communities. They are due, in part, to the
<br />pleasing environment of the Front Range and
<br />
<br />L
<br />
<br />WATER RESOURCES
<br />
<br />Runoff from melting snow makes up the
<br />primary native surface-water supply
<br />available for regulation and use within the
<br />study area. The native runoff originating
<br />above the foothills of the Front Range
<br />drainage basins during the 1950-to-1970
<br />period averaged 617,500 acre-feet per
<br />year. Approximately 76 percent of the
<br />runoH occurs in May, June, and July. The
<br />average annual flows of the streams,
<br />measured at Geological Survey gaging
<br />stations, I are listed in table 11-2 and their
<br />locations are shown on exhibit 11-2.
<br />
<br />J Streamflow rccords were obtained from Geological
<br />Survcy publications HWater Resources Data for
<br />Colorado," Pari I, Surface Waler Hecords.
<br />
<br />11-3
<br />
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