Can Waterfalls Flow Upward? Physics Says No

Gravity Always Wins

No, there are no waterfalls that flow upward. By definition, a waterfall is water descending under gravity over a vertical or near-vertical drop. The energy source is gravitational potential energy converting to kinetic energy as water falls.

What About "Upward" Illusions?

Several phenomena look like upward flow but aren't:

• Wind-Driven Spray: Strong updrafts at tall falls (e.g., Yosemite Falls, Kaieteur) blow mist upward—but the liquid water still falls.
• Capillary Action / Wicking: Water creeps up wet rock faces via surface tension—millimeters, not a waterfall.
• Tidal Bores / Hydraulic Jumps: Water surges upstream in rivers—but that's horizontal flow, not a vertical fall.
• Pumped Hydro Storage: Water is pumped uphill through pipes using electricity—not a natural waterfall.
• Optical Illusions: Forced perspective (e.g., "Magnetic Hill" sites) can make a downhill slope appear uphill.

The Physics Is Clear

For liquid water to flow upward continuously in an open channel against gravity requires an external energy input (pump, pressure gradient, capillary forces at tiny scales). A natural waterfall is the release of potential energy, not its consumption.

So while wind can toss spray skyward, the waterfall itself always, inevitably, flows down.