The City of Vancouver website notes:
Generous donations from local businessman and philanthropist George Propstra, created this one-of-a-kind amenity.
There's a great writeup on Oregon Live about the park and clock. It describes the wonderful show that the clock puts on:
Vancouver's 69-foot-high Salmon Run Bell Tower features a revolving musical display at noon, 2, 4, 6 and 8 p.m. The tower commemorates the life cycle of the Pacific salmon and the fish's value to the Chinook tribe, the original inhabitants of the lower Columbia River.There's a really neat shot of the diorama close up on flikr. You should check it out! Better yet, come to Vancouver and listen to the bells.