The dam node is a GNIS imported point. I've cleaned up hundreds (thousands?) of these in CO. Many are valid, and you can identify where the dam is from topography and imagery. However, I've certainly run into a number where there isn't really a dam to speak of, but the dataset just assumes that if there is a reservoir, there is a dam.

Here is the point's citation: https://geonames.usgs.gov/apex/f?p=138:3:0::NO::P3_FID,P3_TITLE:199732,Windsor%20Lake%20Dam

Original source appears to be a Army CoE document from 1980 listing dams and reservoirs. I'm still generally open to an "on the ground" answer and if there is no practical dam, even if technically one existed in the past, then we can delete it.