Fall Creek is a 5.5-mile-long (8.9 km)[2] southeastward-flowing stream originating on the eastern slopes of Ben Lomond Mountain in the southern Santa Cruz Mountains in Santa Cruz County, before joining the San Lorenzo River, whose waters flow to Monterey Bay and the Pacific Ocean.

Fall Creek is regarded as "the most important tributary stream for coho salmon and steelhead trout in the San Lorenzo River watershed.

[5] Fall Creek "bounces wild and cool all summer, splashing over granite boulders which make it reminiscent of High Sierra streams.

"[6] Fall Creek runs southeasterly, beginning just east of Empire Grade road and running over the granitic rock of Ben Lomond Mountain, before ending at its mouth with the San Lorenzo River at the northern portion of Felton, California.

[7] Fall Creek is considered critical for coho salmon recovery, and is one of the most shaded and coolest tributaries in the San Lorenzo River watershed, providing suitable rearing habitat.