Intermittent Spring, Rhythmic spring in Swift Creek canyon near Afton, Wyoming, US.
Intermittent Spring is a natural water source in Star Valley that discharges water at regular intervals before stopping completely, then repeating the cycle. The spring flows from an underground system where siphoning action creates this distinctive on-and-off pattern without any human intervention.
A local logger discovered this spring during early exploration of Lincoln County and documented its unusual water flow pattern. The discovery later drew scientific attention as researchers studied the phenomenon of rhythmic water discharge in geological systems.
Local residents of Afton and Star Valley incorporate the spring into regional narratives about natural resources and geological formations in Wyoming.
The spring is reachable via a maintained hiking trail from Swift Creek Road that leads directly to viewing areas. The best time to visit is during warmer months when the ground is accessible and you can clearly watch the water cycle through its active and inactive phases.
Scientific measurements confirm this location as the largest rhythmic spring worldwide, producing water flow rates up to 2000 liters per minute during active cycles.
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