Ospreys (Pandion haliaetus) readily colonize suitable habitat created by manmade impoundments. Henny et al. (1978a) found that about 47 percent of the Ospreys in Oregon, and a greater percentage of those in the interior of the state, nest along reservoirs. In northern California, about 20 percent of the Ospreys nest along reservoirs, including 49 percent in the interior of the region (Henny et al. 1978b). Henny et al. (1978a,b) suspected that Osprey numbers had increased in both areas due to the construction of the reservoirs. Also, Henny and Noltemeier (1975) and Henny et al. (1978b) have described situations where Ospreys or their progeny, nesting on natural lakes, have colonized nearby reservoirs as nest sites became less available at the natural lakes. Childress and Eng (1979) documented an increased Osprey population with the construction of shallow impoundments in an existing reservoir. However, the establishment of a breeding Osprey population in an area where breeding Ospreys were not previously found has apparently not been documented. This paper documents such a situation.