I find this to be a good source as well (in addition to Bizer):
https://nhdes.rtiamanzi.org/stations
If you zoom in on the map you can select the Weirs station and get charts of lake level, water temp, etc.
As you can see, the Mean Pool elevation line is not static and fluxuates based on the time of year…so…to echo Bizer’s comment above, we’re a fair amount above mean level for this time of year.