Cataract Falls is so named because it is a collection of cataracts, or individual waterfalls.
Cataract Falls can be visited from two different trailheads, one that approaches from the top, and the other from the lake below.
click here to see lower trailhead and approximate location of Cataract Falls.
I have visited the lake (reservoir) that the falls feed into several times, called Alpine Lake (no doubt a reference to the trees and hilly bits), it is one of the many water storage facilities in Marin.
here are two shots of the lake from the south, one taken on January 11th, 2009, the other sometime in May, 1995:
Alpine Lake is just a little further down the Fairfax-Bolinas Road from the trailhead for Carson Falls.
for more info on Cataract Falls, check out the entry at waterfallswest.com