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Last modified
7/14/2009 5:02:32 PM
Creation date
6/1/2009 11:28:31 AM
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UCREFRP
UCREFRP Catalog Number
8002
Author
Bozek, M. A., L. J. Paulson and J. E. Deacon.
Title
Factors Affecting Reproductive Success of Bontytail Chubs and Razorback Suckers in Lake Mohave.
USFW Year
1984.
USFW - Doc Type
Technical Report No. 12,
Copyright Material
NO
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6 <br />first 32 km, which includes Black Canyon, is characterized primarily by <br />river conditions. Water temperatures within Black Canyon are virtuaiiy <br />constant at 12-13°C due to the hypolimnetic discharges from Hoover Dam. <br />Current velocities may reach 2.1 m/sec (6.5 ft/sec ) during periods of <br />high discharge. There is considerable seasonal and daily variation in <br />water levels (1-3 m) due to discharge cycles from Hoover Dam. <br />The only significant inflow to Lake Mohave is from the Colorado <br />River via discharges from Hoover Dam. There are some warm springs <br />located in Black Canyon, but these inflows are insignificant relative to <br />the Colorado River. The Willow Beach Trout Hatchery, located 18 km below <br />the dam, uses river water which is returned to the river. There are no <br />major diversions of water from Lake Mohave. <br />The river is bordered by the Black Mountains to the east and the <br />Eldorado Mountains on the west. The canyon walls extend several hundred <br />meters above the river and shade the water for most of the day, greatly <br />reducing incident solar radiation. The riparian community in Black <br />Canyon is sparse except for a few stands of saltcedar (Tamarix sp.) and <br />creosote (Larrea tridentata). <br />The transition between river and true reservoir conditions in Lake <br />Mohave occurs in Eldorado Canyon. This is especially evident in the <br />summer when a sharp interface (convergence) develops as cold, <br />nutrient-rich, river-water flows under warm lake-water. Mixing at the <br />interface promotes high phytoplankton productivity in Eldorado Canyon, <br />resulting in a marked change in water clarity between river and <br />lake-water (Paulson et al. 1980b). Below Eldorado Canyon, Lake Mohave <br />expands into Eldorado, Little, and Cottonwood Basins. Cottonwood Basin, <br />located 54 km downstream from Hoover Dam, is the widest point in the
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