These are from last Sat (8Oct2011) in Greene at edge of Gulf Island Pond.  It is an impoundment above Lewiston/Auburn that suffers from a lack of dissolved oxygen - largely due to mill waste and agricultural runoff upstream.  They pump oxygen via bubblers at the bottom of the river to try to lift up the water quality, but GIP is one section of the river that is not classifiable under the Clean Water Act.  The worst classification is C, which applies to most of the industrialized sections of the river (all of it below Berlin, NH), GIP excepted (and a few others probably).