The Trout Unlimited section of the Moorman's is not in good shape. The water is very low and and frozen in some locations. The dam above it was not releasing any reservoir water. A local conservation group used to pressure the Rivanna Water and Sewer Authority, the group in charge of the dam, to keep the river going. In drought conditions, they rarely oblige. Here is a link to an article from 2002: http://www.readthehook.com/Stories/2002/09/19/newsTrickleDownTheMoormans.html
The dam itself should not be there. The water from the Moorman's flows into the Rivanna, where yet another dam is. One wonders why the Water and Sewer Authority needs two dams, when the Moorman's does not provide power.