Kasilof River

About

Kasilof River, Alaska — Tustumena Lake to Cook Inlet, Personal Use Dipnet Fishery. Long before Russian traders arrived, the Kasilof was a Dena'ina fishery. For more than a thousand years before European contact, the Kenaitze people kept seasonal camps along the river during the king and sockeye runs, and dried Kasilof salmon moved inland as trade goods to Athabascan communities across the upper Cook Inlet basin. The 1786 establishment of Fort George near the river's mouth marked the start of sustained outside presence, and by the 1880s Euro-American contact had become continuous.

That contact reshaped the river into an industrial fishery. The Kasilof became the second major cannery-supporting salmon stream on the Kenai Peninsula after the Kenai River itself, with sockeye returning in numbers that historically dwarfed the king run. Glacial turbidity working in the fish's favor: silt carried down from Tustumena Lake kept the lower Kasilof cloudy into midsummer, shielding sockeye from the concentrated sport pressure that built up on the clearer Kenai River, fifteen miles east.

The watershed's timber came under the axe as well. From the 1830s through the 1920s, sawmills, logging drives, and downstream lumber operations worked the Kasilof drainage, feeding a regional timber industry and railroad expansion. The old-growth stands were exhausted by 1910; state forestry conservation began in 1915, and the establishment of state forests in the 1930s ended large-scale logging. The first systematic look at the river's hydrology came earlier still, with USGS survey work beginning in the 1870s.

Modern fisheries science now anchors the river. Just above the Sterling Highway bridge, at River Mile 7.8, the Alaska Department of Fish and Game runs a sonar counting site to track escapement, positioned next to the Kasilof River State Recreational Area — the sonar quantifying the resource while the recreation area opens it to the public. In 1996, ADF&G imposed a fly-fishing-only regulation for king salmon on the Kasilof, one of the few Alaska rivers carrying such a restriction. It has helped hold a healthy king run while easing the combat-fishing pressure seen on the neighboring Kenai.

Today the river reads in three sections. The upper Kasilof runs five miles from Tustumena Lake to the bridge, fly-fishing-only for kings and closed to motorboats above the span, where it supports a wild trout fishery. The middle Kasilof stretches seven miles from the bridge to Crooked Creek as drift-boat water. The lower five miles, from Crooked Creek to Cook Inlet, host one of Alaska's most heavily used personal-use dipnet fisheries — open 24 hours a day from late June through early August, drawing thousands of households to the tidal flats each summer. The Kasilof River State Recreation Area, managed by Alaska DNR, anchors the lower river with two campgrounds and a boat launch serving dipnetters and sport anglers alike. Regulations have tightened recently: the 2025 dipnet king limit stood at two hatchery-produced fish per household per day, and the 2026 king rules were pulled in further after several years of weak Chinook returns across Cook Inlet. Eighteenth-century trade history, refuge-scale geography, and modern management converge here on a single working river.