A few years ago I met a guy at the Smith Creek hot springs out in the middle of the Nevada desert towing a glider. He told me about glider flights from Truckee CA or Minden, NV to Utah and I was amazed then.

Another impressive journey was Truckee CA to Nephi, UT and then back again against the prevailing winds.

https://youtu.be/4xb-CKa-FPI

https://www.weglide.org/flight/407896