- Fish Passage Project
Lemhi River, ID
Page 4 of 10
The plastic fill tubes of the 2.5' AquaDam® are pulled up through the
collar and the fill tubes are inserted. Note the coloration of the larger
AquaDam®. In contrast to the smaller one, it has a white exterior and black
The weight of the second AquaDam® presses down on the collar from the first and
effectively seals them together. Now neither bag can roll laterally.
As with the first AquaDam®, workers must stand behind it to prevent it from
unrolling so that pressure will build up and seal it to the riverbed. Even with
the pumps on low speed, the rock-picker can barely get them out of the way fast enough.