As for the answers to our riddles:
1 - I opened in the Midwest with a watery name, only to head South as a snake, then move lightning fast to my last home - and I'm still not operating!
Tidal Wave opened at Six Flags Great America in 1978. In 1995 it opened at Six Flags Over Georgia, and was called Viper. Finally, the coaster moved to Kentucky Kingdom where it operated until the park closed.
2 - People like to argue over who my true designer was, but even my electric blue track wasn't fiery enough to keep me from being melted down!
The debate over whether Drachen Fire at Busch Gardens Williamsburg was originally designed by B&M or Arrow will probably rage on forever - even though some experts have thrown in their take!
3 - My name contained only 4 characters and a dash, and I was one of ten coasters built of my style, only five of which still operate today.
Another ride no longer with us, XLR-8 at Six Flags AstroWorld was a suspended coaster designed by Arrow. Three of these style rides still operate in the U.S., one in Canada, and one in the U.K.
Hopefully you guys had fun with this, thanks to the many folks who contributed answers!