This is from a Google Maps satellite shot taken during a very low tide.

It shows the Stillaguamish River's South Fork, aka Hat Slough, from WDFW's Boe Road access off Marine Drive down to the delta.

I've labeled the narrow south slough that I twice floated north with the incoming tide, the tidal island that I paddled around, the main south outlet, the lesser west outlet and sandbar, and the north sloughs that were also explored a little.

After two paddling trips here, near the start of an incoming flood tide seemed to work best.

After three kayak trips here, at too low a tide, before the flood has raised the level a foot or two, the interesting water can be hard to get to, or even unavailable.