Gavin's Point Dam is the last dam on the Missouri River. The Missouri River from below Gavin's Point to Sioux City represents the only remaining undammed and unchanneled stretch of this mighty river. The forests in the Gavin's Point and Lewis and Clark Lake area are home to the usual profile of species in the previous accounts and can offer excellent birding, but most birders come to see check out what's on the water. Late fall and winter are prime birding with Black-legged Kittiwake, Sabine's Gull, Glaucous Gull, Oldsquaw, Surf Scoter, and White-winged Scoter uncommon, but regular, with rarities such as Greater Black-backed Gull possible. Expect to see lots of Bonaparte's and Ring-billed Gulls, Common, Hooded, and Red-breasted Mergansers, Common Goldeneye, Bufflehead, and the usual cast of puddle ducks, maybe even a Black Duck! The dam area has also had records breeding American Woodcocks and a King Rail. The adjacent hills are also good places to see Black-billed Magpies, which are uncommon in eastern South Dakota.