Waterpark question for mobility challenged.

[Figment's friends]

Do all of the waterslides have stairs? Is there any way to get to them without using stairs? How big are the waterparks ? UMMMMM I think that's it.

 

[SueM in MN]

Do all of the waterslides have stairs? Is there any way to get to them without using stairs? How big are the waterparks ? UMMMMM I think that's it.

Yes, they basically all have stairs.
Here is a link to the official WDW Guidebook for Guests with Disabilities for Blizzard Beach. At the top of that page, you will find a link the the Guidebook for Typhoon Lagoon.