Water Levels To Be Dropped At Local Lakes HOLDREGE – The Central Nebraska Public Power and Irrigation District will lower water levels at two of its regulating reservoirs this fall in preparation for brief maintenance projects at hydroelectric plants below the reservoirs. Work at the Johnson No. 1 and Johnson No. 2 hydroplants downstream of Johnson Lake will take ...PLEASE LOG IN FOR PREMIUM CONTENT. Our website requires visitors to log in to view the best local news. Not yet a subscriber? Subscribe today!