The dominant algal organism on West Branch Fishing Creek near the village of Elk Grove is Cladophora. The green algae Tetraspora dominates the stretch of Fishing Creek for  downstream of Grassmere Park, where it covers 80 percent of the riverbed.
In West Branch Fishing Creek near Elk Grove, Cladophora is the most prevalent algal species.  Downstream from Grassmere Park, Tetraspora takes over, covering 80% of the riverbed.