Stream Control Conditions The reference table containing the codes, names, and descriptions of the valid stream-flow control conditions. United States Geological Survey, Surface Water User Group UNSP 1 true unspecified The stream control conditions were not specified. AICE 2 true ice anchor The stream control anchored with ice. CICE 3 true ice cover The stream control was convered by ice. CLER 4 true clear The stream control was clear of any obstructions. FILL 5 true fill control changed The stream control was filled. HVDB 6 true heavy debris The stream control was heavily covered with debris. LGDB 7 true light debris The stream control was lightly covered with debris. MAHV 8 true heavy moss/algae The stream control was heavily covered with moss/algae. ALGA 8 false algae The stream control was covered with moss/algae. MALT 9 true light moss/algae The stream control was lightly covered with moss/algae. MAMD 10 true moderate moss/algae The stream control was moderately covered with moss/algae. MDDB 11 true moderate debris The stream control was moderately covered with debris. NFLW 12 true no flow There was no flow over the stream control. SCUR 13 true scour control changed The stream control has scour conditions. SICE 14 true shore ice The stream control has shore ice. SUBM 15 true submerged The stream control was submerged.