The reach of interest to this study can be separated into three different geomorphology reaches including: a 16-rkm low-gradient, sandy, deep, and gently meandering reach downstream from Bonners Ferry, Idaho (rkm 244-228); a 10-rkm, high-gradient, gravel-cobble, shallow and braided reach upstream from Bonners Ferry
(rkm 258-246); and a 2-rkm straight transition reach of high gradient and mixed sand and gravel substrate (rkm 246-244) (Figure 1b).