The World of Waterfalls has been to this waterfall, which you can read about here.

Aaaahhh… Alelele; love this waterfall on east Maui, with the ~40 foot drop, generally small and Cold pool, gorgeous black lava rock formations and steep canyon walls where Makani comes whipping down so fiercely. And yes there are many larger, longer, higher, more majestic and even more easily accessible waterfalls on the island. We love that you must commit to either drive the dry side route from upcountry to East Maui or from Hana, head past the national park’s main area near the pools, trails, parking lot, campground and visitor center. We love it is located in a little known section (or at least it used to be). We love how treacherous the road seems here so narrow , with steep drops, blind hairpin curves and requires horn honking and giving right of way as only one car can pass! We love that it requires a hike, albeit short and mostly level, no elevation gain, plus fording a stream (ONLY when water flow conditions are safe) and climbing through brush & trunks on the far bank of the stream. We love there is one tiny sign on the white bridge that is easy to miss and that there is so few parking spots… none of them easy. We love the grey sand beach where the stream empties into the ocean.