What is it?

Step pools are a series of weir/cross vane structures built at successive elevations that alternate drops in elevation with a vane and a pool habitat. This series of structures is used to connect stream segments with significant changes in elevation and to dissipate stream energy.

( photo from Montana State University Watershed Hydrology Laboratory)

Conservation Benefits

• Provides means for fish passage
• Provides instream habitat for fish and other aquatic organisms
• Reduces streambank erosion and channel cutting

What does it include?

Step pools are usually constructed from rock cross vanes built in a series to gradually connect stream segments with different elevations. Location in the stream, maximum size of drop, number of vanes need, and size of rock should be determined by a technical expert. These structures must be properly designed and constructed to prevent them from becoming fish and aquatic organism barriers.