Here are four of us Hutchonians at Carey Park, sitting on the wall that extends from the fountain with the colored lights. This was at the south end of Main Street and at night while driving south on Main, you could see the lights change color and light the waters.
A few years later, the flood control dike was built and the moved the fountain off to the east side of the entrance. I haven't been past there at night for many years so I don't know if it still functions in the same way.
If you copy and paste the link, you can see a post card with the fountain at night.