In any case, I now know it was...
“Both the lake and the pass were named after the ill-fated Donner Party, which wintered unintentionally near the lake in 1846. Donner Memorial State Park is on the east end of the lake and provides campsites with access to several different beaches. There are also various hiking trails in the park.”
https://en.wikipedia.org/wiki/Donner_Lake
__________________________________
Panoramic view of Donner Summit from above CPRR Tunnel #6 with Donner Lake in the distance
https://en.wikipedia.org/wiki/Donner_Pass
____________________________________________
"The 31-year-old Austrian teacher, an avid hiker, had just reached the 9,000-foot summit of a Northern California mountain range ahead of his companions when he raised his arms for a picture and was struck in the back of the head. The electricity shot through his body and exited through his foot, and he was too stunned to know what had happened."..."The trio was hiking from Donner Summit to Squaw Valley, a short section of the rugged, 2,650-mile (4,264-kilometer) Pacific Crest Trail that runs from Mexico to Canada and challenges experienced hikers from all over the world."
