From either Carson Pass, or a half mile to the south from the pass, you want to connect with the Colorado Trail and head west. The trail drops down in elevation some toward Lost Trail Creek, then easily regains elevation to a non-descript, tundra pass that separates the Lost Trail drainage from the Pole Creek drainage. If you're backpacking in, we found a good campsite location about one mile west of this pass in the open tundra, on a bench not far from an overlook of Cataract Lake. Warning: There may be a large herd of domestic sheep grazing in this area.
From the Pole Creek/Lost Trail Pass, turn north and ascend mostly tundra-covered slopes with some scree higher up to the ridge that connects Carson and Tundra Top. At the ridge, turn west and amble on to the large summit area of Tundra Top, peering occasionally over to the north and looking down the dramatic cliffs. When we climbed this summit in 1992, the summit register identified this as "Meadow Mountain." From Carson Pass, you can probably do this peak alone, easily in a half day, but why stop with one? Cataract Peak is just north, less than a mile away.
Drop north off the summit of Tundra Top and follow directly on the ridge that connects over to Cataract Pk. A steep, loose rocky section will quickly give way back to the tundra so prevalent in this area. From the connecting saddle, head NW towards the peak, using game and sheep trails to lead to a SW ridge that you can follow to the main summit ridge. About 300 feet of this ascent will be on steep, very loose, pebbly scree. A minor cliff band near the top should not prove an obstacle. Once through it, you can stroll east to the summit. As you make the traverse from Tundra Top to Cataract, you may want to watch carefully down in the Mill Gulch basin to the east. This isolated basin seems to attract a fair sized herd of elk.
For the return, you can use that steep, loose scree to your advantage. From near the summit, we walked back west just a little to a break in the cliffs and did a scree-ski descent for about 400 feet down the south face. Then we contoured back over to the saddle and regained Tundra Top. From Tundra Top, if you have not already climbed it, you can easily traverse over to Carson Peak, See the route description for that summit.
Links to other information, routes & trip reports for this peak that may be helpful.