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WSPC12679
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Last modified
1/26/2010 4:17:25 PM
Creation date
8/7/2007 12:09:42 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8220.114
Description
Water Projects - Delores Participating Project
State
CO
Basin
Colorado Mainstem
Water Division
5
Date
7/1/1996
Author
DOI-BOR
Title
Delores Participating Project - Environmental-Biological Assessments-FONSI-and Proposal to Modify the Operation of McPhee Reservoir-Etc - 1996 - staff comments Reviewed Copy - 07-01-96 and 07-23-96
Water Supply Pro - Doc Type
Report/Study
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<br />002182 <br /> <br />canyon. Although some mature cottonwoods occur adjacent to the active channel. the denser overstory forests <br />generally occur in old overflow channels and oxbows. These areas have become separated from the active river <br />channel and the trees are dependent on groundwat~r for survival. <br /> <br />Riparian shrub dominated communities he:come: increasingly common f\1rth~r downstream from McPhee Dam and <br />become the dominant riparian community below Disappointm~nt Cre:~k. The: invasion of salt cedar Clllmarix <br />Tl\mOS;ssimll) is evident along the Dolores River downstream from the confluence of Disappointment Creek. These <br />shrub c.ommunities are generally dominated by coyote wiliow CSlIlix exi~llI) but also include other shrub~ such as <br />desert olive and gambel oak (Ol.lercu~ I'lImbelii). The understory is generally sparse and composed of a variety of <br />grasses and forbs. <br /> <br />Emergent wetland areas are not common in the Project area. Some small communities dominated by wetland grasses, <br />spikerushes CEieocharis spp.) and ",shes (~ spp,) occur in small depressions and backwaters. A major feature <br />of the Lone Dome Recreation Area is a cooperative effort b)' Reclamation and CDOW to create, preserve, and <br />enhance about 75 acres of wetlands. Tne wetlands are IIpproxinuttely seven miles dov..nstream from McPhee Dam on <br />lands historically irrigated for pasture and hay. <br /> <br />HistoncaUy. the wetland and -riparian communities along the Dolores River have been affected by livestock grazing <br />and years of lowino flow in the Dolores River during the summer months. Grazing was discontinued on lands <br />administered. by the ELM and the USFS along the Dolores River from McPhee Dam to approximately four miles <br />upstream of Slick Rock in the late 1980's. Grazing was discontinued on CDOW's lands at about the same time. <br />McPhee Dam was closed in 1984 and has SitlCe provided continues flows in the Dolores River. In the past 11 years <br />tnere has been a substantial increase in riparian vegetation along the river. <br /> <br />Tne limas acguired by the united States 'Were infested with noxious weeds which proliferated in subsequent years ciue <br />to lack of control measures. Tne" most common noxious pian~ spc:cies include the foliowin;: <br /> <br />Musk thistle (CRrOUtl< n::!p.!,~) <br />r .... {'-. . . <br />,-anaaa t.n.Istle \LT~nlr:- ~~.en~ej <br /> <br />Russian knapweed (':'-~r<lr>li;,..~ rt'r-.en~'! <br /> <br />Attempts to contra! these infestations Mve focused on herbicide appiications. During the past five years. the USFS <br />has coociucted prescribed bums in tile Lone Dome arep. in the fftI:. followed in the spring with selective herbicide <br />treatment. :-ne ELM has conducted sil1li.ia.:- eradication efforts in the BT'IIdfield Erici:;e area and the cnow has <br />initiated control measures on thei:- iancis. Recentiy. inse::~ predators have Riso been introduced to cornoll: Inus!: <br />thistie. It IS anticipated that the efforts wili control the noxious wceci problem. <br /> <br />E1\TVIROr-.,'MEl\"T AL CONSEQUENCES <br /> <br />Proposed Action - Implementation of the proposed action may benefit the wetiand and riparian habitats by providing <br />higher summer flows in the river. especially during yeRrs which wouid be designed as "normal" or "dry" under the no <br />action alternative <br /> <br />No Action - Implementation of the no Bction alternative may have a minor detrimental effect on the wetland and <br />riparian communities durin!; ciesignated "dry" years. <br />
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