The Upper Falls are easily accessible but only 20 ft tall. However, if you continue upstream you'll reach the stunning 200 ft Lower Falls.
More info at to-hawaii.com http://www.to-hawaii.com/maui/waterfalls/puohokamoafalls.php
More information http://mauiguidebook.com/hikes/puohokamoa-falls/
Address Wahinedee, 96713, United States
Coordinates 20°52'11.204" N -156°10'54.062" E