I think this plank is done.

Salmon grilled on a cedar plank is yummy.  Being a cheapskate, I use the same plank over and over again.  The current one split in half a while ago with no actual functional problems, but I think after last night it is just completely done...

Plank smoldered during cooking, despite having been pre-soaked

Bottom side of plank after final use

The salmon itself was delicious, given that it was wild-caught Coho with a mustard, bay-caper-infused vinegar, rosemary, honey, and lemon zest marinade.