File:Ontario Sessional Papers, 1913, No.49-113 (1913) (14778817004).jpg

Identifier: n13ontariosessional45ontauoft (find matches)
Title: Ontario Sessional Papers, 1913, No.49-113
Year: 1913 (1910s)
Authors: ONTARIO. LEGISLATIVE ASSEMBLY
Subjects:
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Contributing Library: Robarts - University of Toronto
Digitizing Sponsor: Ontario Council of University Libraries and Member Libraries

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was notnoticed in the estuary of the Moose: and, if formed, while the rapids remain openin the early part of wanter. it has disappeared before spring; so that, neither thissort nor anchor ice have any material effect in causing the Jams during the break-up. These jams are due to the fact that the break-up progresses from the upperpart of the river before the ice has materially weakened in the estuary, bringing im-mense quantities of loose ice down against a sheet that is still practically three feetthick and finnly attached to numerous shoals. Until the water level has risen sufficiently to allow the ice in the estuary to clearthese shoals, there is little or no breaking up of this sheet. The loose ice forms awall or natural dam, which advances down whichever channel offers the least resist-ance, or sometimes alternately down, one and then the other, past the islandswhich separate the two channels in the upper part of the estuary. This wall of ice 1913 IXVESTIGATJONS AT JAMES BAY. 11
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12 EEPOKT T. & X. 0. EAILWAY No. 71 rises to a height of ahout twelve ieet in the centre of the channel, and where thecliannel is most constricted, sometimes to a height of twenty feet at the sides. Itsadvance causes a roar like that of a heavy rapid which may be heard for miles. Assoon as the l)reak-up Ikhs advanced to the wider portion of the estuary below theislands, the ice discharges Cjuietly and usually in from one to two days is almost allout of the river. THE BREAK-UP OF THIS YEAR. The break-up of the ice in tbe estuary of the Moose Eiver occupied one weekin 191-2. On May 3nl, the last big jam of ice at the Fishing Tent Eapid broke, andthis let an immense volume both of water and of ice into the tidal compartment.The pressure of this nmss rapidly broke up the ice for about two miles in both chan-nels. Later in the same day, the ice jam wiiich formed in the South channel couldbe seen from Moose Factory, somewhere in the vicinity of South Bluff Island. Fromthe Eevillon Post,

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