A 3ft tall AquaDam and a specially constructed double-tube 2ft tall overflow AquaDam were abutted into this custom-made aluminum fish ladder in Scott River, Siskiyou County, CA.

The purpose of this fish ladder is to regulate water temperature by increasing water depth, while also facilitating the passage of fish through the dammed-off river channel.

The workers manually transported the fish ladder apparatus to the center of the river channel.

Workers have setup the 3ft tall single closed end (SCE) AquaDam at its starting bank. To ensure proper installation and functionality of a SCE AquaDam, it is essential to have a starting bank that maintains a higher elevation than the body of the AquaDam. The open end and fill-tubes of the SCE AquaDam must remain elevated above the full height of the dam along its designated path. It is important to note that an AquaDam will only reach its maximum height at the lowest elevation point along its designated path.

Workers restrain the roll end as the AquaDam fills, to allow the unrolled portion to build head above the surrounding water.

As the AquaDam is filled with water the unit will want to naturally unroll. Restraining the roll allows for control as the AquaDam is installed.

After the unrolled length has a few inches of head above the surrounding water, workers release a few feet of roll, unrolling a few feet of length, then hold the roll tight again, and repeat the process until the dam reached the fish ladder apparatus.

The 3ft tall SCE AquaDam has completely unrolled and will need to finish being filled with water.

Both AquaDams have been installed abutted to the fish ladder. The upstream water has pooled up and seepage appears to be minimal. The pooled water is going through the fish ladder.

Looking upstream, we can see the fish ladder working in conjunction with the two AquaDams.

Looking downstream at the fish ladder as water is passing through it.

Another AquaDam was installed upstream of the fish ladder and two AquaDams. This AquaDam was used to restrict the flow while the fish ladder and two downstream AquaDams were installed.

The upstream AquaDam was impounding and diverting a considerable amount of water. Workers are attaching a wooden beam to re-rolled the AquaDam and remove it from the river.

Specialized brackets were attached to the ends of the beam to help with re-rolling. Ratchets were then attached to the brackets so that the workers could re-roll the dam.

A worker is lowering the fill-tubes of the SCE AquaDam so that the water that was inside can be released back into the river and he dam can be removed.

Workers carefully re-roll the SCE AquaDam, from it closed end to the open end.

As the workers re-roll the upstream SCE AquaDam, the pool behind the fish ladder grows.

When removing and re-rolling an AquaDam, it is advisable to drain as much water from the interior as possible, as the water contributes to the overall weight of the structure.

Workers take the time to re-roll the SCE AquaDam into a nice tight roll, removing as much water as possible.

Finally the roll is secured with a rope to keep it from unrolling and removed from the riverbed.