Sorry, not it

Was there last week but no.

Not Ragged

Not in the northwest

Not Big Trout.
Huge relief you when you see this

I can't say I recognize the location, but your last clue and the map make me wonder if this is the end of the eight million mile portage from Bonfield into Dickson.  I've done that carry in the other direction a few times, many years ago, and it sends you through the five stages of portage (pain, misery, anguish, despair,  resignation).  How far you get on the five stages is directly correlated to the length and terrain/topology of the portage.  On a portage of this length, you get very close to resignation - the realization that there is no end to the carry; that this is how and where you will live out your days.  

Anyway, that's my guess....

I'd guess it is the end of the portage from Round Island Lake to Dickson Lake.   Quite a bit more painful than the Dickson-Bonfield portage!

I've only done that portage once and it was in the Dickson to Round Island direction.   I'll never forget the brutal climb at the start of the portage and as luck would have it, it was my turn to carry a pack and the canoe!