The headwaters of the Kasilof begin at Alaska eighth largest lake - Tustumena Lake.
At over 73,000 acres, Tustumena Lake is the largest glacially fed Lake on the Kenai Peninsula.
It is fed year round by the Tustumena Glacier an extension of the Harding Ice Field.
Both Tustumena Lake and the Kasliof River are within the Kenai National Wildlife Refuge which provides numerous wildlife viewing opportunities.
The Kasilof River runs approximately 20 miles from Tustumena Lake to the Upper Cook Inlet.
Large runs of Sockeye, King, Coho, and pink salmon spawn in the Kasilof river drainage including a healthy population of rainbow trout.