(mm 2274) If you are not in a hurry and you want some extra views of Old Snowy and Mt Adams, or maybe a more solitude walk, you can take the old Cascade Crest Trail route bypassing Cispus Pass and the Yakima Indian Reservation.
This 2.8 mile route will add 1.4 miles doubling the distance to Cispus Pass. It will also add 684 ft of elevation gain going northbound.
If you don't want to miss the jagged SE face of Gilbert Peak, you can back-track the 0.2 miles and 119 ft to Cispus Pass.