3 December 2011. Great Meadows NWR in Concord MA. View of dike between Lower Pool (lower left) and Upper Pool (right). Photo taken with Nikon D90 and Nikkor 24-70 mm with yellow/orange filter (040M) and circular polarizer. Photo processed with Photomatix Pro 4.1, Nik Silver Efex Pro 2, and Adobe Photoshop CS5.