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Lake Superior Outflow Conditions


                                                       4 June 1997


                     Lake Superior Outflow Conditions

    The International Lake Superior Board of Control, under authority
    granted to it by the International Joint Commission, has set the Lake
    Superior outflow to 3320 cubic metres per second (m3/s) for the month
    of June.  This is less than the 3490 m3/s outflow recommended by the
    regulation plan for the month of June due to reduced capacities at the
    hydropower plants in Sault Ste. Marie, Michigan and Ontario, and a
    limitation on the number of gates that can be opened while maintenance
    work continues at the control structure at the head of the St Marys

    This flow will be released by discharging about 2100 m3/s through the
    hydropower plants and passing the remaining flow through the control
    structure and the four spillway gates at the U.S. Government hydropower
    plant.  An average of seven gates will be opened in the control
    structure in June.  As the repair work on the control structure gates
    progresses during the month, some gates will be temporarily closed to
    assure worker safety. At other times additional gates in the control
    structure will be opened in order to maintain the recommended average
    outflow for the month.  All four of the spillway gates at the U.S.
    Government hydropower plant are expected to be opened for the month.
    Gate #1 that supplies the Fishery Remedial Works channel will be
    maintained fully open throughout June.

    During May, the water supply to Lake Superior was about average, while
    the supply to Lakes Michigan-Huron was above average.   Currently, Lake
    Superior is 23 centimetres (cm) above its long-term average beginning
    of June level and about 13 cm above the level recorded last year.  The
    level of Lakes Michigan-Huron is about 54 cm above its long-term
    average level and about 40 cm above the level of a year ago. The Board
    will continue to monitor conditions on Lake Superior and downstream and
    will advise the International Joint Commission accordingly.

    Mr. Doug Cuthbert, Environment Canada, Burlington, Ontario is the Board
    Member for Canada.  Mr. Dwight Beranek, Acting Deputy Division
    Engineer, Great Lakes and Ohio River Division, U.S. Army Corps of
    Engineers, is the Acting United States Board Member.

    Additional information can be obtained from Mr. Peter Yee, Great Lakes
    St.Lawrence Regulation Office, Environment Canada, Cornwall at (613)
    938-5725 or by e-mail at Peter_Yee@pch.gc.ca. or from Mr. David
    Schweiger, Great Lakes Hydraulics and Hydrology Branch,  Detroit
    District, U.S. Army Corps of Engineers, at (313) 226-6440 or by e-mail
    at david.l.schweiger@usace.army.mil

    For more information about the International Lake Superior Board of
    control, see our Internet homepage at