The Green Narrows is one of the most extreme kayaking runs in the Eastern US. Water is released on a regular basis from the Tuxedo Power Station with a 100% release being equivalent to 216 cubic feet per second (6.1 m3/s). This regular flow allows for year-round kayaking and hence makes it a popular destination for whitewater kayakers and canoeists.
The river has an average gradient of 178 feet per mile (33.7 m/km, or 3%), with a half-mile (800 m) section dropping roughly 342 feet (104 m) and containing 11 major class IV+ to V+ rapids. Through this area, the water often channels through extremely tight slots as narrow as 4 feet (1.2 m) wide as the river funnels through a stunning gorge. The three major rapids on the river ("The Big Three") are called "Go Left and Die", "Gorilla" and "Sunshine".[citation needed][relevant?] Gorilla is considered the most visually impressive rapid on the river. It consists of the river funneling into a 4-foot (1.2 m)-wide slot ("The Notch") and is then immediately followed by an 18-foot (5.5 m) waterfall ("the flume") and then another 10-foot (3.0 m) waterfall ("Scream Machine").[2] Sunshine is considered the most difficult and dangerous rapid and consists of a 14-foot (4.3 m) waterfall landing on a jagged rock shelf below. The river gets considerably more difficult at higher water levels; however, the Green has been run at up to 300% flows (over 30" on the stick gauge).[3]
On the first Saturday of November, many paddlers arrive at the Green to participate in the annual Green Race.[4][5]
In 1906, the river was nearly dammed in four places (instead of the one dam upstream built around 1921). The engineers for the four-dam concept were Ladshaw and Ladshaw from Spartanburg, SC, and the now-annual celebration of man's failure to advance is called "Ladshaw Day".[importance?]