Saw a Common Loon late this afternoon at Triadelphia Reservoir.  It was actively diving on the Howard County side above the emerging island.   Other birds seen (in Howard and Montgomery County unless noted otherwise):

Mallard - 20 
Double-crested Cormorant - 2 
Great Blue Heron - 4
Bald Eagle (imm) - 1
Killdeer - 5 
Spotted Sandpiper - 3 (Mont Co)
Solitary Sandpiper - 1 
Ring-billed Gull - 1
Belted Kingfisher - 1 (Mont Co)
Pileated Woodpecker - 1 each county

Bill Hill
Glenwood, Md.