I ate at Sunday River Brewing Co. yesterday for the first time in a long time. Food and service was good and prices were in line with other similar establishments. Looking forward to seeing what they do in Gorham.
Elevations on the NGVD29 datum were tied to sea level, but the current NAVD88 elevations are tied to a benchmark called Rimouski on the St. Lawrence Seaway in Quebec. It is held as zero elevation. There is a new datum slated to come out in 2022, but it may be delayed.
The elevation on the disk is based on a GPS survey by the Young Surveyors Group of the NH Land Surveyors Assoc. back in June. A report and/or article will be published soon. The GPS survey is more accurate than the LiDAR data for this particular spot.