Charter a bush plane from McCarthy, Valdez, or Gulkana to land on one of the gravel strips below the Nizina Glacier Lake.
There is a strip just below the glacier toe, which involves carrying your gear a half-mile to the river or there is a strip at Glacier Creek on the Chitistone River where a short 8-mile stretch of Class I and II will take you to the Nizina. There may be a strip at Dan Creek as well. Either way the logistics are many as you sort out how best to start your trip.