Anchor River Cohos
The Anchor River is a spectacular fall destination for silver salmon. Known for their aerial acrobatics and aggressive strikes, Anchor River coho enter the clear coastal stream in late August. Monitoring the RM 2 sonar counts helps fall anglers time their stream visits perfectly with incoming freshwater pulses.
River Mile 2 Sonar
Dual-beam counter monitors coho passage just above the tidewater.
Mid-August - Sept Peak
The run peaks as temperatures cool and autumn rains begin to raise water levels.
Active Bite Response
Unlike spawning reds, silvers aggressively strike flies, spinners, and cured baits.
From the River
Live Anchor River Coho Sonar Chart
*Sonar counts represent daily passage at the River Mile 2 station. Data updates daily from ADF&G. Filter historical years using the dropdown menu.
Inside the River Mile 2 Sonar
The Anchor River sonar station is located two miles upstream from the mouth. It is the same transducer array used during the spring king salmon run, re-activated in August to track coho.
Because coho salmon run during late summer when water levels fluctuate due to heavy fall rains, the sonar is a critical tool. Daily counts provide sport anglers and fishery managers with a clear picture of Cook Inlet run health, determining bag limit parameters.
Rain, Tides, & Silver Pushes
Anchor River coho are highly sensitive to weather and river conditions. Unlike kings, which migrate steadily, coho often pool in the saltwater estuary until conditions are ideal:
Rain Pushes
Fall rains raise the water levels and cool the stream temperature. This surge of fresh water acts as a beacon, triggering large schools of silver salmon to move out of Cook Inlet and rush upstream.
Tidal Entry
Coho travel on high tides. The incoming saltwater push floods the lower river pools, letting fish swim upstream easily. Fishing the lower loops during high tide is highly productive.
Tactics for Anchor River Silvers
Coho salmon are aggressive predators. Once they enter freshwater, they retain a strong predatory drive, striking lures and baits out of hunger or territorial aggression:
- Casting Spinners: Cast size 4 or 5 weighted spinners (such as Blue Fox Vibrax in pink, orange, or silver) and retrieve slowly through deep pools and tailouts.
- Twitching Jigs: Twitching colorful lead-head jigs (1/4 to 1/2 oz in pink, purple, or black) with marabou feathers triggers spectacular strikes in slow-moving water.
- Egg Fishing: Under a float bobber, drift cured salmon roe or soft beads along current seams where silvers congregate.
Historical Anchor River Coho Totals
| Year | Total Sonar Count | Run Strength | Management Notes |
|---|---|---|---|
| 2022 | 8,900 | Exceptional | Very strong fall run, daily limits met by most anglers throughout August. |
| 2023 | 5,400 | Moderate | Low rain levels in August delayed fish entry, but late surges hit targets. |
| 2024 | 6,800 | Healthy | Consistent passage counts matching historical median averages. |
| 2025 | 7,200 | Strong | Heavy late-August rains triggered a massive pulse of sea-fresh silvers. |