I was in Stevens the 2nd week of May 2020 and 3rd week of May 2022.
The first time, many sources Allen mentions were dry. The "elongated potholes" shortly before the Baker exit were dry and the large spring right after Baker was so pathetic that I couldn't even gather from it and had to go much further to find a random shaded pothole. Lower Stevens had enough water.
The second time, it was much wetter despite the overall water year not having better stats. Potholes were great and the spring was running all the way down to the Baker exit.
Didn't go to Cliff either time--one time back via Fold and the other time up and over to Halls Creek.
You can check old SWE and Precipitation data for that basin to see how it compares to this year, but like I said it seems to not be easily determined. It was also too hot in 2022 by mid-May and I'm trying to do those types of trips earlier from now on.