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<br />NUTRIENT
<br />
<br />Figure 14, Concentrations of nutnents In agricultural areas ollhe veOL were
<br />greater than concentrations In other land-use settings A log scale IS used due to
<br />the large range 01 concentrations
<br />
<br />11\12' l)l nalUrall.nmlltinn' hUI i..
<br />prohabJy repn::-.crnuli\'c of ..midI
<br />..Iream... in the Cnlprado Plateau.
<br />:\kJiiln nmccntraliurl'> of l1utrienh
<br />al agri..:uhural ,it..', ah.a were
<br />
<br />grCi,llt'r than lflt'dian conCcTHrallllll"
<br />at Illlxed land-u....' and urn;!n 'Ih:..
<br />v.ithin the SllUlhl"m R\\l'ky i\lnun~
<br />lain", Tht' moan arl"a.. ,h\l\\'n In thl."
<br />har ..:h:1I1 arc down..ln:am from Vall
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<br />and Cre"ted Butte. Colorado I rig:,
<br />61. and are "lream~ that are nol
<br />dominaled by wa,lewatcr emuent
<br />"uch a.. might !:Ic found In large
<br />metwpllhtafl area.... Con':l'll1r;JtiOlh
<br />(If mtnte and mtratc \\ere wuhin
<br />Slate "t.lnJard.. for agncultural
<br />wak'r u..c. Water from the agricul-
<br />tural .,Ircam" j" nnt commonly u<,ed
<br />j"\)r JOtlll.'...tlC ,>upply.
<br />r.l'HIl)g~ and agrkuhul.l' {"1m-
<br />Irihull' 10 l'!l'\atl'flsuSpl'ndl'd-
<br />"'l'dillll'nt l'fHln'ntratio!1.. in the
<br />Color:ulu Plall':'tu Su"pcnJl'J-
<br />,cdinwn! con....entr.lliolh in 111<..'
<br />.,tream.. anJ river" nlthc Colorado
<br />Plate;l\I were lllu....h greater than
<br />...',lllI.:cntratilln... In the Southern
<br />Rlleky ~luuntallh (og. I)). Jue 11\
<br />large pan In Jil1'erl'lll"l'" I1l't\~l'en
<br />till' "ediml'lltM) gl'olog) Ilf the
<br />
<br />NITROGEN CONCENTRATIONS AT THE UCOL AGRICULTURAL
<br />SITES WERE GREATER THAN CONCENTRATIONS FOR MANY
<br />AGRICULTURAL SITES NATIONWIDE
<br />
<br />Total nitrogen (the sum of nitrite. nitrate, ammonia, and organic nitrogen) concentrations at the UCOL agricul-
<br />tural monitoring sites (Reed Wash and Dry Creek) were ranked in the group of national agricultural sites with the
<br />highest concentrations, The map below shows a comparison of average annual total nitrogen concentrations OJt the
<br />two UeOL agricultural ~ites with agricuhuml sites in other i\'A WQA Study Units. TIle average conct'ntmtions for
<br />the UCOL sites were 3.8 milligrams per liter for Reed \'lash and 3.1 milligrams per liter for Dry Creek and are
<br />less than State instream standards. Average annual total phosphorus concentrations at the two agricultural siles in
<br />Ihe UCOL also ranked among the group of national agricultural sites with the highest total phosphorus concelllra-
<br />lions.
<br />
<br />EXPLANATION
<br />
<br />TOTAL NITROGEN IN STREAMS-AGRICULTURAL AREAS
<br />,'t'
<br />.'P
<br />'.
<br />
<br />Average annual concentration of total nitrogen.
<br />in milligrams per liler
<br />. Highest/greater than 2.9i
<br />. Medium 10,64 to 2,91
<br />lowest lIass than 0,64\
<br />
<br />......
<br />
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<br />
<br />Average annual total nitrogen input.
<br />in pounds per llcre, by countv.lor 1995~98.
<br />Inputs are from fertillzer. manure. and the lltmospOere
<br />. Greater than 25 pounds per acre
<br />6 to 25 pOunds per acre
<br />Less than 6 pounds pel acre
<br />
<br />...,
<br />Reed Wash......
<br />
<br />Dry Creek
<br />
<br />IS \'.alL'( QualHY 1Il the L:rpl'r Colorado R]\\.'r Ba,in
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