The purpose of this document is to establish stream reaches in the Scott River and Shasta River basins based on the best current information. Reaches are segments of stream with geographically similar flow and channel structure (Bovee et al. 1998). Stream reach breaks are based on physical (i.e. gradient, channel type, substrate) and natural hydrological (i.e. stream flow, accretion) characteristics. Previous studies have divided both basins into reaches (e.g. CDFG 2009, McBain & Trush 2009 and 2012, and SVRCD and McBain & Trush 2013). Those reports were reviewed as part of this process and many of the reach breaks are at the same or similar locations established in the previous studies.