The Coon Rapids Dam is located in Hennepin County, Minnesota, on
the Mississippi River approximately four miles downstream from the City of
Anoka and approximately twelve miles upstream from the downtown section
of Minneapolis. The structure was transferred to the Hennepin County Park
Board by Northern States Power Company in 1969. Since 1969 the
structure has undergone considerable modifications to make the facility meet
its new recreational role, with the installation of walkways and observation
platforms. The hydropower redevelopment at Coon Rapids will send
between 1,000 and 8,000 cfs (the range of discharge for the turbines), which
previously passed over the spillway, through the turbine units. This will
have an impact on downstream D.O. concentrations because the spillway is
an excellent aerator, increasing D.O. concentrations, while the turbines do
not add any air to the water.
Olivier, Cecilio; Daniil, Ekaterini I.; Gulliver, John S..
Dissolved Oxygen Investigation Coon Rapids Hydroelectric Redevelopment Project.
St. Anthony Falls Hydraulic Laboratory.
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