Plat of Water Districts No 5 and 6, 1888

Plat of Water Districts No 5 and 6, 1888

This 1888 map of the watersheds of Boulder County is part of a series of maps prepared by the Colorado State Engineer to identify ditches and help manage water. Farmers had already dug the majority of Boulder's ditches by this time, bringing water to previously-arid steppes and mesas. However they had yet to start storing the water they had diverted. Only a few small reservoirs had been built in the area by the 1880s. These lakes, which stored water drawn from the St. Vrain River, are shown in blue, north of the town of Longmont.

Map courtesy of the Bob Crifasi Collection

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