Here's some info I've collected.
1. "Flints Pond" is the name in current use by DCR and Town of Lincoln. he Lincoln Land Trust, the town Water Dept, and historical sources use "Flint's Pond," referring to the original homestead .
2. At the time of dam construction (c.1900), the pond widely called "Sandy Pond" in state and local sources. "Sandy Pond Dam" continues to be the primary description in state and local official docs, including the Water Dept that manages it. "Flints Pond Dam" is sometimes used. 

So here's the cleanup I've contributed:
1. Pond titled "Flints Pond". Dam is "Flints Pond Dam." This is inconsistent with local naming, but probably easier for a general user. 
2. Stream flow previously reversed as an outflow

gdt, feel free to close out this note if you think this is the right resolution