Water Monster reports from the 1780s
2 cases, best-documented first. Page 1 of 1.
We map claims, not creatures. A case is what some source says someone saw or heard, with the link to that source. It is not proof that anything was there, and a retelling counts once, not as a second sighting.

Water Monster · Penobscot Bay, Maine · 1780
Captain Little swore he saw a sea serpent at sunrise in Penobscot Bay which sank out of sight before marines could shoot it.

Water Monster · Ogden, Utah · 1780
Witness reports Captain Linle of the United States Navy saw a sea serpent near Boston in 1780.