FirstLight Power is modifying the winter drawdown level of Candlewood Lake.  The state Department of Energy and Environmental Protection, U.S. Fish and Wildlife Service and the Candlewood Lake Authority have agreed that an intermediate winter drawdown of between 5 feet and 7 feet supports the ongoing weed management, and includes an additional benefit of further management of the Zebra Mussel population seen in the lake. The shallow 4 foot to 6 foot drawdown will instead go to a deeper elevation in response to identification of adult zebra mussels in the entire main stem of the Housatonic River and the Rocky River Impound at self sustaining populations, and at depths in Candlewood Lake outside the drawdown lowest limits.  First Light began monitoring for Zebra Mussels in 2011.  A fall survey done in mid-October identified two adult Zebra Mussels on the powerhouse concrete and 10 adults on the adjacent rocks.