Buoy 10 Salmon Fishing: Tides, Bite Windows, and Bar Safety

Buoy 10 is the most famous salmon fishery on the West Coast, and the most misunderstood. Every August the stretch of the Columbia between the river mouth and Astoria fills with Chinook, coho, and boats — and the anglers who go home with fish are almost never the ones who launched earliest. They’re the ones who planned the day around the tide.

This is the tide-first playbook: what each stage of the tide means, where the working pattern says to be, how to read the wave buoys, and — because this water is genuinely dangerous — when to stay off the bar entirely.

What Buoy 10 actually is

The fishery takes its name from the red channel buoy that marks its western boundary near the river mouth. The legal fishing area runs from the Buoy 10 line upstream past Astoria to the boundary near Tongue Point. It’s a staging area, not a highway: ocean-bright salmon push in with the salt water, hold in the estuary while their bodies adjust, and respond to the tide more predictably here than anywhere else in their run.

That’s the whole premise of fishing it. In a river you find fish by reading water. At Buoy 10 you find fish by reading the tide table, because the fish arrive, stack, and leave on a schedule the tide sets.

How the tide drives the bite

The estuary breathes twice a day. On the flood, cooler salt water pushes across the bar and upstream, and fresh salmon ride it in. On the ebb, the river shoves everything back toward the ocean — including a surprising number of fish that came in on the previous flood and drop back out.

The working consensus among Buoy 10 regulars, guides included, goes like this:

• Incoming (flood) tide is the productive water. Fresh fish are arriving, the estuary is filling, and trolling with or across the current stays controllable.
• The last two hours of the flood through high slack is the window most people plan the whole day around. Fish that entered on the flood are as far into the estuary as they’ll come, concentrated and still aggressive.
• The first hour or two of ebb can stay productive — fish begin sliding back toward the ocean and you can troll down with them.
• Maximum ebb is generally the slowest fishing and the most dangerous water. Long before it’s a safety problem it’s a boat-control problem: several knots of outgoing current makes precise trolling speeds hard to hold.

None of this is a law of nature — a fresh push of fish can make a mediocre tide stage good. But if you only get one six-hour window on the water, stack it around the top of the flood.

Planning the day backward from the tide

The practical method: look up high slack at the Hammond or Astoria tide station, then build the day backward. If high slack at Hammond is 11:40 a.m., the prime window is roughly 9:30 a.m. to 12:30 p.m. — launch with time to be in position before it starts, not scrambling in the middle of it.

Two details that catch people out:

1. The tide turns later upstream. Slack at the Buoy 10 line and slack at Astoria are not the same minute — the stage propagates upriver. If you’re fishing the upper end of the fishery, shift your window later.
2. Tide height matters, not just timing. Big exchange days (large difference between high and low) mean stronger currents in both directions: better-defined fish movement, but harder boat handling and a nastier max ebb on the bar.

The bar: when not to go

The Columbia River bar is one of the most dangerous stretches of water on the West Coast, and August fills it with small boats. The mechanism that kills people is simple: outgoing current against incoming swell. On a strong ebb, the river’s current runs head-on into ocean waves, which slows them, stacks them taller, and packs them closer together. A swell that was a gentle rise and fall offshore becomes a breaking wall on the bar at max ebb.

The discipline that keeps you alive:

• Check the Coast Guard bar report before you commit. Cape Disappointment issues bar condition reports and restrictions; a restriction for your boat size is not advice, it’s a closure. Treat it that way.
• Cross near slack. If you’re heading outside or coming back in, time it to slack water or the flood. The classic accident is a boat running the bar inbound on max ebb because the fishing died and everyone was ready to go home.
• Watch the period, not just the height. A 6-foot swell at 14 seconds is a long, sloped hill. A 6-foot sea at 7 seconds is a steep, close-together mess — and the ebb makes it worse. Short period plus ebb is the combination to refuse.
• Have a bail-out plan that isn’t the bar. Inside the estuary, weather protection is a matter of moving a few miles. Outside, it isn’t.

Most Buoy 10 fishing doesn’t require crossing the bar at all — the fishery is inside the river mouth. If your boat or experience makes the bar a question, the answer is to stay inside. The fish come to you on the flood anyway.

Reading the buoys before you launch

Two NOAA stations do most of the work for this fishery:

• 46243 (Clatsop Spit) sits at the entrance and reports wave height and period — the closest thing to a real-time report of what the bar itself is doing.
• 46029 (the offshore Columbia buoy) shows what’s arriving: today’s offshore swell is the entrance’s conditions in a few hours.

The reading habit worth building: check height and dominant period together, then overlay the tide. Rough rule — the longer the period relative to the height, the more forgiving the water. The same numbers that are comfortable on the flood can be unfishable at max ebb, so a buoy reading means nothing without knowing which way the river is pushing.

Baseline Maps pulls all of this into one screen for exactly this fishery — live bar status from the Coast Guard reports, the 46243 and 46029 feeds, tide predictions with the crossing windows marked, and the marine forecast — so the go/no-go call happens at the kitchen table instead of at the buoy line. It’s in the app under the Buoy 10 dashboard.

Regulations: check the day you fish

Buoy 10 is jointly managed by Washington and Oregon, and its rules move: season dates, which salmon you can keep, endorsement requirements, and mid-season emergency changes are all normal here. Nothing in this post is a regulations reference. Check the current WDFW and ODFW regulations — including emergency rule updates — the day you fish, not the week before.

The short version

Fish the flood, peak effort in the last two hours before high slack. Respect the early ebb, quit before max ebb. Never cross the bar on a strong ebb against swell, and treat Coast Guard restrictions as final. Read 46243 and 46029 with the tide stage in mind, and build the whole day backward from the Hammond tide table. The anglers who treat Buoy 10 as a tide problem first and a fishing problem second are the ones cleaning fish at the dock.