This singletrack connects Silver Lake Trail with Mt. Elwell. From the Silver Lake Trail (12E31), take a right and head northwest along the west side of Long Lake. You'll drop down through a fun section of trail before reaching Mud Lake on the right.
Just after Mud Lake, you'll come to a junction for the Mud Lake Spur (11E14A). Taking a right will give you access to Long Lake. Left will continue on Mud Lake Trail (11E14) with a climb up to the Mt. Elwell Trail.