Since the beta on the approach is not super detailed, here is a poor drawing I made to help find the correct climber's path up to Warm Lake. After leaving Surprise Lake, it's 1.5 miles to the path after passing one other path on the left and 4 small streams followed by a section of Trail 1120 where it is bounded by logs. The third stream was only percolating up on the right, so you may or may not actually see all 4. You may want to click on this to make it larger to read.