Snowbird Glacier is generally considered safe to travel on during summer months without technical gear , but visitors during all seasons are strongly cautioned to beware of surface water and moulins , large vertical shafts carved by meltwater which dive from the surface into the heart of the glacier .
Snowbird Glacier is generally considered safe to travel on during summer months without technical gear , though light crampons or Yaktrax will significantly improve footing . 
 Visitors during all seasons are strongly cautioned to beware of surface water features and moulins , large vertical shafts carved by meltwater which dive from the surface into the heart of the glacier .