I don't have any gory photos of Cascade Peak coming down, but I was a frequent visitor to the Rivers of America in the summer of 1998 and did document its final sad state. No exact dates for the first two, but they are undoubtedly from July or August:
These are detail shots of Cascade Peak, showing its deterioration prior to removal. The first two are from August 30 and the following three from September 9.
When I returned to the area on September 30, much of the peak was gone:
By December 20, the area had been replanted:
Finally, a 1997/2008 before and after view of the area... still popular with the ducks!