Plume in upper Gowanus canal, July 31, 2011

Mappers include Leif Percifeld, Hans and Eymund Diegel -

 

Gowanus Canal Conservancy: www.gowanuscanalconservancy.org

Gowanus Dredgers Canoe Club: www.gowanuscanal.org/

Public Laboratory: publiclaboratory.org

Grassroots Mapping: grassrootsmapping.org

Done