Full-spanning Log Jams

A log is placed across the stream channel and embedded into either side of the bank and the substrate with the top 2/3rds exposed. One single log or a series of full-spanning log jams can be employed in an area of shallow stream; usually 1st or 2nd order or low velocity. Over time, as the water flows over the complex, gravel will build up at the upstream end of the log and a pool will be scoured out at the downstream end, creating a "pool-riffle" complex that is ideal for fish habitat. They are:

• for use in small streams
• generally described as "wiers" or "sills"
• creates habitat by building "pool-riffle" complexes
• use of attachments not mandatory.
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