My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
8045
CWCB
>
UCREFRP
>
Public
>
8045
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
7/14/2009 5:02:32 PM
Creation date
5/20/2009 10:22:46 AM
Metadata
Fields
Template:
UCREFRP
UCREFRP Catalog Number
8045
Author
Pacey, C. A. and P. C. Marsh.
Title
Resource Use by Native and Non-Native Fishes of the Lower Colorado River
USFW Year
1998.
USFW - Doc Type
Literature Review, Summary, and Assessment of Relative Roles of Biotic and Abiotic Factors in Management of an Imperiled Indigenous Ichthyofauna-Final Report.
Copyright Material
NO
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
73
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
Show annotations
View images
View plain text
9 <br />Dams and Reservoirs -- There are three major impoundments on. the lower Colorado <br />River: lakes Mead, Mohave, and Havasu. These differ fundamentally. in morphology <br />and limnological characteristics (summarized in Table 1). <br />Hoover (Boulder) Dam and Lake Mead were created primarily to provide flood control <br />and storage of irrigation water. The dam also generates hydroelectric power. Primary <br />inflows to Lake Mead are the Colorado River at the outflow of Grand Canyon' and <br />Virgin River. The Virgin River is largely unregulated, although there are several <br />diversion dams, which under some conditions result in severe flow depletions. Lake <br />Mead also receives treated urban wastewater from the city of Las Vegas, which adds <br />substantial quantities of inorganic nutrients to the system. It is morphologically complex <br />with several basins separated by narrow, deep channels. As a result, different parts of <br />the reservoir exhibit unique limnological characters. In one study the Upper Basin (at <br />the Colorado River inflow) was oligotrophic, Boulder Basin was oligo-mesotrophic, and <br />Las Vegas Bay was mesotrophic (Paulson et al. 1980). Overall, the lake is <br />characterized as "mildly-mesotrophic" (LaBounty and Horn 1997). Outflow of Lake <br />Mead is a hypolimnetic discharge at Hoover Dam in Black Canyon. <br />Davis Dam and Lake Mohave were created primarily to re-regulate fluctuating <br />discharge from Hoover Dam. Hydroelectric power also is generated at Davis Dam. <br />Lake Mohave is best described as a "run of the river' impoundment. An upper reach <br />below Hoover dam flows for about 40 km through a steep, narrow canyon which <br />empties into a modestly-wider "Little Basin." Next is the relatively wide (6 km) <br />Cottonwood Basin, which narrows at its downstream end to form another canyon reach <br />s The Colorado River through Grand Canyon now is regulated by Glen Canyon <br />Dam on the mainstream about 16 km above Lees Ferry. The dam releases cold, clear <br />hypolimnetic water year around, with discharge regime determined largely by demands <br />for generation. Sediment inputs to the Colorado River in this reach are almost <br />exclusively via tributary streams, the two largest of which are Paria and Little Colorado <br />rivers, and the mainstream runs clear unless these other rivers are in flood.
The URL can be used to link to this page
Your browser does not support the video tag.