Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Kugruk River is a 60 mile long river in northwest Alaska. It is located on the Seward Peninsula, and flows from the SE part of Imuruk Lake in a NE direction to Kugruk Lagoon, at Kotzebue Sound, Chukchi Sea 5.5 mi SE of Cape Deceit, Kotzebue-Kobuk Low.Its Inuit name was reported in 1899 as "Koogroog" by Schrader and Brooks (1900, map 3) USGS. This appears to be the stream that Petroff in 1880 named "Mammoth" "from the occurrence of Mammoth bones in the vicinity" (Baker, 1906, p. 424). Reported as "Swan River" in 1901 by D. L. Reaburn (in Mendenhall, 1902, pl. 42), USGS.