Buckeye Lake is a hidden gem just outside of Leadville. This alpine lake sits above treeline and views over onto the Mosquito Range. You can actually fish this lake, but you'll have to wait until at least June for it to completely thaw out.
If you are looking for an extra challenge and have good route finding skills, you can make your way up the hillside and tackle the 12,871 foot Buckeye Peak directly north of the lake. You can then connect over to the Sangree Hut Winter Ski Trail and loop back down to the creek.