Historically high flood levels were observed during flooding in Lake Champlain and the Richelieu River from late April through May 2011. Flooding was caused by record spring precipitation and snowmelt from the third highest cumulative snowfall year on
Flynn, Robert H. rflynn@usgs.gov,Rydlund, Paul H. prydlund@usgs.gov,Martin, Daniel J. dmartin@usgs.gov. Network global navigation satellite system surveys to harmonize American and Canadian datum for the Lake Champlain Basin. 2016-01-01.