This second effort within WaterSHED’s technical report series provides an updated technical overview of the WaterSHED monitoring program and presents program findings to date from data collected between 2018 and 2021. A total of 19 tributaries representative of basin characteristics, and one mainstem station, across the NSRB were selected to form the WaterSHED monitoring network (Table 1, Figure 2). Tributary monitoring stations were located as close as possible to the confluence with the NSR.