LYIP Begins Rocking Process of the Intake Diversion Dam

The critical rocking process of the Intake diversion dam by Lower Yellowstone Irrigation began August 7 and should be completed in about a week. In 2012, the last year when rocking was permitted, 1500 cubic yards of sandstone boulders were used to bring the height up to 2.5' above the dam. The 2012 rocking was extensive after the flooding of 2011. This year, the ice jams removed all the rock from the top of the dam. However, LYIP manager James Brower said the river seems to be responding faster this year so less rock may be needed.

Rocking was not permitted in 2013 and water dropped below the full water right level. This year, rocking was delayed by negotiations with the Montana State Historical Preservation office. By August 6, water was at 1.7' above the dam with the gates 100% open. Once rocking began, the water level immediately started to rise and by August 8, the level was 2' above the dam.