Provides information on Mudgee and District Environment Group, a stakeholder in the Macquarie-Cudgegong River Management Committee. Efforts of the group to protect the Macquarie Marshes in New South Wales (N.S.W.); Importance of the Macquarie Marshes to the health of the Macquarie River; Consequences of the construction of the Burendong Dam in N.S.W.