Yellowstone lake cover 136 surface miles and it is the largest high elevation lake in North America.
Interesting fact is that there is no fishing allowed from the “fishing bridge” since 1973.
Yellowstone Lake runs through numerous parts of the park but we found the best view to be on East entrance road. I would highly recommend Steamboat Point picnic ground for awesome views of the water during a stop for lunch or dinner. Steamboat is just a mile or so east of the fishing bridge. Enjoy.