The overall condition of streams in the San Gabriel River Watershed has been assessed by collecting benthic macroinvertebrates (BMIs) and attached algae during dry weather conditions in the spring and summer at over a hundred stations since 2008. BMI communities provide an integrated view of stream water quality over time since their juvenile forms spend most of their lives living on the stream bottom or water column. The attached algae community includes both diatoms and soft algae whose populations change rapidly in response to changes in water quality. The biotic condition for BMI populations at each site was determined using the California Stream Condition Index (CSCI) and for attached algae the Southern California Algae IBI (SoCA IBI). The SoCA IBI is in the process of being replaced by the Algal Stream Condition Index (ASCI) which will be presented here in 2021.