PRÆGLACIAL DRAINAGE.

PRÆGLACIAL DRAINAGE.

It is claimed that nræglacial drainage will be restored by diverting the flood waters of St. Mary’s lakes in Teton county. northern Montana, storing them in that county, and leading them east by a canal through the ridges at the head of Milk river. The water of the St. Mary’s lakes comes from the high neaks of the Rocky mountains, which do not continue in casterly course (as is the case with rivers farther south), but overflow northerly by St. Mary river to the Saskatchewan, and lose themselves in Hudson bay. Their natural course eastwards has been blocked by the glacial debris near the foot of the mountains, It will he restored by the proposed canal, and. as in pnrglacial times, the waters will flow cast down the slope of the country.

The head of Milk river is in the low rolling country. east of the foot of the mountains, and the river itself flows generally nnrtheist in two branches. North and South Fork, which unite on Canadian territory. The river then flows easterly for over 150 miles, when its trend is southerly again to Montana. whence it loses itself in the Mississippi. The broad Milk river valley in Montana is admirably adapted for irrigation nurnoses. hut it has not water enough, as the sunnjv from the river is deficient, owing to the lack of high mountain area at the headwaters. The mountain catchment area will he restored to the stream by the diversion canal.

The St. Mary river water is used only in Canada, where, seven miles north of the international line, is a canal completed in 1000 between whose head and the site of the proposed dam at the foot of St. Marv lake several large streams discharge into the St. Mary river and furnish water enough for irrigation nnrnoses. This floodwnfer it is intended to utilise, and. as Canada has enough of it and to snare, it is not supposed anv international complications will arise in consequence.

The proposed St Marv canal will, from its head 00 the St. Marv river to the North Fork of that river, be 27.4 miles: and the estimated cost of its construction is set down as $87,000. which includes that of the dam and headgates and the drop ot the North Fork. The canacifv of the canal will he T.200 cubic feet ncr second: the amount of nnhlic land to be reclaimed is T20000 acres, which, at its probable value of $35 per arre. represents $4,200,000. and would sustain a population of an.000 Bv storage in the lower Milk river vallrv the evicting area of reclaimed land, including the use of Milk river, it is estimated, can be increased to 300,000 acres.

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