This Fish Bulletin describes the methodology for the use of log and boulder weirs in California rivers and streams. This report does not replace Part XII Fish Passage Design and Implementation of the California Salmonid Stream Habitat Restoration Manual (Flosi et al. 2010). The intent of this report is to supplement Part XII and describe the use of log and boulder weirs to improve instream habitat, beyond the need for fish passage. This report provides a review of current literature on the subject, combined with input from California Department of Fish and Wildlife scientists and engineers, and others with experience and expertise in the subject.

This Fish Bulletin discusses low-tech process-based restoration of riverscapes and draws extensively from the work of Wheaton et al. (2019) to describe low-cost restoration techniques that can improve riparian, floodplain, and instream habitat in many California streams.

This Fish Bulletin updates the previous description of large wood projects, describes the assessment and planning required, and the construction techniques needed for the implementation of large wood projects in California. This report combines a review of current literature on the subject with input from California Department of Fish and Wildlife scientists and engineers, and others with experience and expertise in the restoration of large wood in California’s streams and rivers.