Big Blue Lake is situated at the northern end of California’s Russian Wilderness. I came across it in Lautner’s Day & Section Hikes, Pacific Crest Trail, Northern California (2010), where reaching it is portrayed as an off-trail adventure hike. And so it was. Going cross-country to Big Blue is a lot of work but, once you’re there, it’s an exquisite turquoise blue gem of an alpine lake, set in a rugged granite bowl. On reflection, it would have been better to have hiked to it on a cooler day and on one where the scenery wasn’t faintly obscured by smoke from a wildfire smoldering some 10 miles to the northwest in the Marble Mountain Wilderness (Island Fire). Ah, hindsight.