There is some published literature out there that says there are Steelhead in Lake Okanagan. At one time, the lake was connected to the Columbia River system through the Okanagan River. I can assure you that there are steelhead size rainbows in OK Lake (and bigger), but they are not ocean bound. And yes, there have been historical reports of salmon and steelhead in the system as far up as Penticton but that is long gone. Having said that, there are some land locked rainbow trout that were once ocean going in many areas of BC. There are efforts to have sockeye (not Kokannee) return to this system by efforts of the local FN people, DFO and other community based efforts.