riverly
1 : of, relating to, or befitting a river: any of a number of actions, emotions, or other outcomes showing kindly interest and goodwill toward a river or other water body; 2 : serving a beneficial or helpful purpose toward improvement of the conditions of a water body—exhibiting admirable stewardship behavior <riverly works>
A large and powerful coalition of Los Angeles activists coalesced around a riverly social change agenda in the 2000s.