The stream that feeds Keʻanae Peninsula pauses to create a couple of swimming holes just below the bridge, 0.9 miles after the 16-mile marker. You won’t see anything by driving by, but if you pull off immediately before the bridge you’ll find a deep crystal-clear pool beneath. It's best to observe the pool but not to take a dip. Locals often swim here, but there are 'No Trespassing' signs. The waters are also susceptible to dangerous flash floods.
According to one local source, a flood could be close if the water here is big or murky.