- Fish Ladder Repair on the Russian River
Healdsburg, CA (2001)
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This project was located in the Veteran's Park Memorial boundaries. A new fish
ladder needed to be incorporated into a 50 year-old removable
board dam. The fish ladder was needed to improve the fish passage during the
critical summer months. The board dam had been erected to create the
county swimming hole and had been blocking fish passage ever since.
The existing concrete overflow slab was used as a surface to install a 5' high AquaDam®
in order to block off half of the river flow. We then installed one 5' x 50', one 5' x 100',
one 4' x 30', and two 3' x 100' AquaDams®. We also used one 8' high AquaDam (not shown)
to surround the lower portion of the work area.
The concrete slab that the AquaDams® are sitting on extends completely across the river.
The water is flowing over the slab and then over boards that normally make up the summer dam.
The boards (with a metal frame attached to the concrete slab) are simply pushed up with an
excavator to block the river flow during normal operations.