Hundreds of protesters rallied at the Maui County building Friday afternoon demanding more transparency in the clean-up of the Wailuku River.
Demonstrators say the Wailuku Water Company is removing truckloads of rocks and hiding it from the public.
This is upsetting because the valley is known to be a sacred site on Maui for the Hawaiian people, demonstrators say.
The company was contracted to restore the river, which was washed out in September's heavy rains.
Protestors want Maui Mayor Alan Arakawa, and the Maui County Council to closely monitor the Wailuku Water Company, to maintain the mauka to makai stream flow and to consider Hawaiian cultural practices.