Kasilof River

Alaska·Kenai Peninsula·60.32° N, 151.26° W

Flow

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Water Temp

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Condition

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Weather

52°F

Chance Light Rain

near Kasilof

The Kasilof is the Kenai's quieter little brother — a short (about 17 miles), fast, cold, glacially fed river that drains Tustumena Lake, the largest lake on the Kenai Peninsula, and runs milky blue-gray with rock flour all summer. That silt is the whole personality of the place: you don't sight-fish and you don't match a hatch, because you usually can't see more than a foot into the water. You fish for salmon on the move — sockeye stacking on inside-corner gravel bars, kings holding in the deeper lower river, silvers in the fall — with beads, yarn, and streamers drifted through known lies. Show up expecting a dry-fly trout river and you'll be lost; show up to swing and drift for bright, ocean-fresh salmon in light current and it delivers.

Practically, the Kasilof fishes as two very different reaches. The upper river, from the Tustumena Lake outlet down to the Sterling Highway bridge at Mile 109, is the fly-friendly sockeye water — a series of shallow gravel bars on inside bends where reds break out of the heavy current and you can wade out and intercept them. It's genuinely wadeable and the closest thing to classic fly water on the river. The lower river, from the bridge down to tidewater at Cook Inlet, is bigger, pushier, and king country; most people fish it from a drift boat (the whole river is drift-boat-only — no motors while fishing), and the early kings are largely hatchery fish staging to run up Crooked Creek, which enters just below the bridge. Peak sockeye is roughly July 10-25; the second, wild king run of big fish builds in mid-July; silvers show in August.

The trade-offs are honest ones. The water is cold, fast, and silty — wading demands care, and the glacial current is deceptively strong. Access is easy and public (the Sterling Highway parallels the lower river, with state rec sites at the bridge and at Crooked Creek), which means the bank gets busy during the sockeye peak, and the mouth hosts a heavy personal-use dipnet fishery (Alaska residents only) in July that clogs the estuary. And the king fishery lives and dies by emergency order — closures and single-hook, no-bait, release-all-wild rules are the norm now, not the exception. Come for the sockeye on the upper gravel bars and the fall silvers, treat the kings as a bonus you'll need to check the regs on, and you'll read the river right.

Species

Sockeye Salmon
Abundant · Late Jun-Jul (peak Jul 10-25) · 4-8 lb
The signature fly target. Fish the shallow gravel bars on inside corners above the Sterling Highway bridge with a flip-and-lift presentation — sockeye don't feed in-river, so it's a lip-hooked drift on a short line, not a hatch match. Ocean-fresh fish on a light rod; a second run pushes into August.
Chinook Salmon
Common · Mid-May-Jul (wild run mid-Jul) · Early ~15-25 lb; late wild fish to 50+ lb
The early run is largely hatchery fish (adipose fin-clip) staging for Crooked Creek; the late run is wild and big. Heavily regulated by ADF&G emergency order — expect frequent closures and single-hook, no-bait, release-all-wild rules. Confirm the current EO before fishing kings. Lower-river drift-boat water.
Coho Salmon
Common · Early Aug-early Sep (peak late Aug) · 6-12 lb
Arguably the best pure fly-rod salmon fishery on the river — silvers chase and eat, so bright streamers and leeches produce. The fall fishery, less crowded than the sockeye peak.
Dolly Varden
Common · Jul-Oct · 10-20"
Both resident and sea-run char are present, eating eggs, flesh, and beads behind spawning salmon. Best in the upper river near the Tustumena Lake outlet later in the season.

Species	Abundance	Best Season	Size	Notes
Sockeye Salmon	Abundant	Late Jun-Jul (peak Jul 10-25)	4-8 lb	The signature fly target. Fish the shallow gravel bars on inside corners above the Sterling Highway bridge with a flip-and-lift presentation — sockeye don't feed in-river, so it's a lip-hooked drift on a short line, not a hatch match. Ocean-fresh fish on a light rod; a second run pushes into August.
Chinook Salmon	Common	Mid-May-Jul (wild run mid-Jul)	Early ~15-25 lb; late wild fish to 50+ lb	The early run is largely hatchery fish (adipose fin-clip) staging for Crooked Creek; the late run is wild and big. Heavily regulated by ADF&G emergency order — expect frequent closures and single-hook, no-bait, release-all-wild rules. Confirm the current EO before fishing kings. Lower-river drift-boat water.
Coho Salmon	Common	Early Aug-early Sep (peak late Aug)	6-12 lb	Arguably the best pure fly-rod salmon fishery on the river — silvers chase and eat, so bright streamers and leeches produce. The fall fishery, less crowded than the sockeye peak.
Dolly Varden	Common	Jul-Oct	10-20"	Both resident and sea-run char are present, eating eggs, flesh, and beads behind spawning salmon. Best in the upper river near the Tustumena Lake outlet later in the season.

Ideal wading flow1,000–2,500 CFS

Blow-out>5,000 CFS

Ideal water temp40–55°F

The Kasilof's USGS gauge reads river level (stage in feet) only — there is no discharge measurement, so watch relative level and clarity, not a target flow number. A rising, dropping-clarity river means warm weather or rain has spiked glacial melt; a steady-to-falling level fishes best. But the gauge only tells you the water — the fishery is run timing. Mid-July is the sockeye peak (July 10-25) on the upper gravel bars, with the wild king run building. Late August into early September brings silvers, the best pure fly-rod salmon action. October-November offers steelhead, resident rainbow, and Dolly bead fishing with low crowds. Mid-May through June has early hatchery kings, subject to emergency order — always check the current ADF&G counts and EO before a king trip.

Sections

2 sections on this river

Lower Kasilof — Bridge to Cook Inlet

FloatSalmon

Below the bridge the river grows bigger, siltier, and tidally influenced on its run to Cook Inlet — king-salmon drift-boat water more than a wading reach, with the Crooked Creek confluence and its sonar site in the lower miles. King fishing here runs entirely on ADF&G emergency orders (hatchery-only, single unbaited hook in recent seasons). A resident-only personal-use dipnet fishery congests the mouth in July.

Best for: King salmon by drift boat (when open by emergency order) and sockeye through the lower river; heavy-gear, silty water.

Upper Kasilof — Tustumena Lake to the Sterling Highway Bridge

WadeSalmon · Bull Trout · Rainbow Trout

The wadeable upper reach draining Tustumena Lake down to the Sterling Highway bridge at Milepost 109. Glacial, cloudy water, but shallower and more approachable than the lower river — gravel bars and gentle runs that hold sockeye salmon along the seams and the trout and Dolly Varden trailing them. The closest thing to fly water on the Kasilof.

Best for: Wade fishing for sockeye salmon along the bank seams, plus Dolly Varden and rainbow trout on beads.

Regulations

Current fishing rules and restrictions

King salmon fishing on the Kasilof is governed by annual ADF&G emergency orders that routinely override the standing regulation booklet in-season — verify the current EO before you fish. The 2026 king order (EO 2-KS-1-18-26) runs May 1-Aug 15 from the mouth up to the ADF&G markers at the Tustumena Lake outlet. Sockeye, silver, and trout/char rules follow the Southcentral sport-fish regs and can also shift by EO with run strength. Alaska sport fishing license required (nonresidents need a king stamp for kings).

King salmon: only one unbaited, single-hook, artificial lure (per 2026 EO)
May 1-Jun 30: bag/possession is one hatchery king 20" or greater (adipose fin-clip scar); naturally produced (wild, intact adipose) kings of any size may not be retained — release immediately
Closed area: the reach directly downstream of the Crooked Creek confluence, behind the mid-channel island, is closed to all fishing May 1-Jul 31 to protect staging kings
River is drift-boat-only — no motors are permitted while fishing
King escapement goal: SEG of 700-1,400 naturally produced kings, monitored via the Crooked Creek weir
Personal-use dipnet fishery at the mouth (Alaska residents only, roughly late Jun-early Aug) is separate from sport fishing

Kasilof king regulations change in-season on emergency order — this is the rule here, not the exception. ADF&G runs a Kasilof sockeye sonar (site 5) and the Crooked Creek king weir, and those counts drive the orders. Always confirm the current EO and counts at the ADF&G Northern Kenai sport fishing report and the emergency-order page before loading the truck; a fishery open last week may be closed this one.

Source: Alaska Department of Fish and Game. Regulations change annually — verify before fishing.

Access & Logistics

Getting there, fly shops, and lodging

Getting There

Kasilof, AK

~15 min from Soldotna, ~3.5 hrs from Anchorage

Camping & Lodging

Crooked Creek State Recreation Site (campground with walk-in bank access), Johnson Lake State Recreation Site, and Kasilof-area private lodges and cabins. Soldotna, ~15 minutes north, has full services.

On the western Kenai Peninsula near the town of Kasilof, about 15 minutes south of Soldotna and roughly 3.5 hours (150 mi) south of Anchorage via the Sterling Highway. Public access is easy: the Kasilof River State Recreation Site (Mile 109, day-use, boat launch at the bridge) and Crooked Creek State Recreation Site (campground plus walk-in bank access) cover the lower river; the Tustumena Lake / upper-river launch is reached via Tustumena Lake Road near the Johnson Lake area. The river is drift-boat-only (no motors while fishing), so nearly all guided trips run out of drift boats — there is no dedicated fly shop on the Kasilof itself, and guide-service reports are the primary local intel. Nearest airports: Kenai Municipal (PAEN) ~25 min; Anchorage (ANC) ~3.5 hr drive.

Conditions data is live from public monitoring networks. Regulations change annually — always verify current rules with your state fish & wildlife agency before fishing.

More in Alaska

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Kenai Peninsula

Anchor RiverAK

The one Alaska steelhead stream you can fish out of the truck — the largest sea-run rainbow run in Southcentral, plus wild kings, silvers, and Dollies, all wade-fished off Sterling Highway pullouts at Anchor Point.

Kenai RiverAK

Alaska's marquee road-accessible river — turquoise, glacier-fed water running from Kenai Lake at Cooper Landing down through Skilak Lake to Soldotna and Cook Inlet. Not a hatch-matching river: this is a bead, flesh, smolt, and egg fishery built entirely on salmon, where five species of Pacific salmon feed some of the largest wild rainbows and Dolly Varden anywhere. Conditions here are flow plus weather; the fishery itself is run timing and in-season ADF&G emergency orders — check current sonar counts and orders before a trip, because a green flow gauge does not mean an open fishery.

Other regions

Chena RiverAK

A clearwater Arctic grayling river that runs right through Fairbanks and up Chena Hot Springs Road into a state rec area — one of Interior Alaska's best road-accessible dry-fly fisheries, rebuilt by catch-and-release.

Gulkana RiverAK

The rare interior-Alaska river that fishes like a trout stream — a clearwater, Wild and Scenic system draining Paxson Lake down through the Copper River Basin, where you can watch a fish eat instead of dead-drifting a bead blind through glacial silt. It holds one of the densest Arctic grayling populations in the state, a genuinely wild native rainbow fishery, and a summer push of king and sockeye salmon off the Copper. The signature trip is the 3–4 day float from Paxson Lake to Sourdough; the road-accessible lower mainstem is where the bank crowds work the salmon. Kings are heavily managed by ADF&G emergency order — check current status before planning a trip around them.

Iliamna RiverAK

A glacial river flowing off the Chigmit Mountains into Pile Bay at the northeast corner of Iliamna Lake — distinct from the town and the lake that share the name. Flyout-only water reached by float plane and lodge, home to trophy rainbow trout, Arctic char, grayling, and Dolly Varden holding behind a strong sockeye run. The gauge near Pedro Bay streams flow, stage, and water temperature, and carries a live NOAA forecast overlay. Conditions are flow plus weather; the fishery is run timing — check ADF&G Bristol Bay counts before a trip.

Kvichak RiverAK

The outlet of Iliamna Lake and the engine of Bristol Bay — the Kvichak drains the largest sockeye salmon run on earth and grows the trophy rainbow trout that feed on it. Flyout-only water reached by float plane and lodge, not road; the gauge at Igiugig streams a big, stable lake-outlet flow. Conditions here are flow plus weather, but the fishery is run timing — check ADF&G Bristol Bay counts and current emergency orders before a trip.

Little Susitna RiverAK

Road-accessible Mat-Su salmon river draining Mint Glacier to Cook Inlet — silvers, sockeye, pink, and chum through summer, plus wild rainbow and grayling in the clear upper canyon near Hatcher Pass.

Nuyakuk RiverAK

A short, powerful lake-fed river in the Wood-Tikchik country, draining Tikchik Lake toward the Nushagak past the famous Nuyakuk Falls. Flyout-only water reached by float plane and lodge — trophy rainbow trout, grayling, and Dolly Varden holding behind a huge sockeye run. The gauge near the Tikchik outlet reads a lake-buffered flow best used as a trend and blow-out signal. Conditions are flow plus weather; the fishery is run timing — check ADF&G Bristol Bay counts and emergency orders before a trip.