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.
The dominant algal species in West Branch Fishing Creek near Elk Grove is Cladophora. The green algae Tetraspora dominates the downstream stretch of Fishing Creek, covering 80% of the riverbed after Grassmere Park.