Among the streams which, taking rise in the eastern gorges of the Rocky Mountains, run into the South Platte, the most considerable has somehow acquired the French name of Cache la Poudre. It heads in and about Long's Peak, and, after emerging from the mountains, runs some 20 to 25 miles nearly due east, with a descent in that distance of about 100 feet. Its waters are very low in Autumn and Winter, and highest in May, June and July, from the melting of snow and ice on the lofty mountains which feed it. Like all the streams of this region, it is broad and shallow, with its bed but three to four feet below the plains on either side. Greeley, the nucleus of Union Colony, is located at the crossing of the Cache la Poudre by the Denver-Pacific Railroad, about midway of its course from the Kansas Pacific at Denver northward to the Union Pacific at Cheyenne. Here a village of some 400 to 500 houses has suddenly grown up during the past Summer. The first irrigating canal of Union Colony leaves the Cache la Poudre six or eight miles above Greeley, on the south side, and is carried gradually further and further from the stream until it is fully a mile distant at the village, whence it is continued to the Platte. Branches or ditches lead thence northward, conveying rills through the streets of the village, the gardens or plats of its inhabitants, and the public square, or plaza, which is designed to be its chief ornament. Other branches lead to the farms and five-acre allotments whereby the village is surrounded; as still others will do in time to all the land between the canal and the river. In due time, another canal will be taken out from a point further up the stream, and will irrigate the lands of the colony lying south of the present canal, and which are meantime devoted to pasturage in common. Taking the water out of the river is here a very simple matter. At the head of an island, a rude dam of brush and stones and earth is thrown across the bed of the stream, so as to raise the surface two or three feet when the water is lowest, and very much less when it is highest. Thus deflected, a portion of the water flows easily into the canal. A very much larger and longer canal, leaving the Cache la Poudre close to the mountains, and gradually increasing its distance from that stream to four or five miles, is now in progress by sections, and is to be completed this Winter. Its length will be thirty miles, and it will irrigate, when the necessary sub-canals shall have been constructed, not less than 40,000 acres. But it may be ten years before all this work is completed or even required. The lands most easily watered from the main canal will be first brought into cultivation; the sub-canals will be dug as they shall be wanted.