It's a small, piped spring about a hundred feet from the shelter. Since it's up around 3600 feet, though, we can be sure that there will be some snow to melt. Maybe not the cleanest snow, but there will most certainly be enough for our purposes.
I would say go for the 0 degree bag, anyway, just in case. I know this is Backpacking LIGHT, but since it's the first winter trip for a lot of folks, it's best to err on the side of caution for now. Plus, like I said, Goddard is close to 3600 feet in elevation, so quite a bit higher than the town of Shaftsbury. Try the point forecast for Glastenbury.
Also, another word of warning, probably more than necessary... For driving into the trailhead, if you're coming from Bennington VT, you'll be turning left soon after a curve, and there's a truck lane going up the hill. This is probably the safer direction to come from. If you're coming from the east on route 9 (like me), the trailhead is a right-hand turn at the bottom of a long hill. Watch out for tailgaters behind you, and icy patches in the road-- the forecast shows rain/snow on thursday and freezing on thursday night. You know how it is.
PS: anyone have a decent thermometer? I'd like to get an accurate impression of the lows while we're out there, just to see how my sleeping bag works ;)