Water Monster reports from the 1830s
38 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 · Boothbay, Maine · 1831
Witnesses in Boothbay report seeing an enormous brown and yellow-brown monster resembling a snake with humps on its back, estimated to be over 200 feet long, swimming near the shore and wharf.

Water Monster · Rockingham County, New Hampshire · 1830
Witnesses report a sea serpent near the Isle of Shoals, with one crew sighting it within twenty feet and another describing its size and appearance.

Water Monster · Bay of Bengal · 1835
Lieut. W. Holley reports seeing a whale-sized, leopard-spotted creature with a large dorsal fin and lizard-shaped head in the Bay of Bengal, which threw stones at their ship.

Water Monster · Portsmouth, New Hampshire · 1839
Witnesses on a schooner report seeing a large sea serpent with an elephant-like head and long line of humps moving rapidly off Portsmouth Harbor.

Water Monster · Barnstable County, Massachusetts · 1833
Witness reports that a man at the mast-head and others on board the schooner Mechanic observed a large marine creature resembling a serpent swimming near their vessel.

Water Monster · Logansport, Indiana · 1838
Witness reports that Mr. [name] saw an animal raise its head three or four feet above the water with a head three feet across and dingy color with large yellow spots.

Water Monster · Provincetown, Massachusetts · 1835
Captain Shibbles and his crew reported seeing a large sea serpent with a barrel-sized head and mane-like neck swimming rapidly near Race Point Light.

Water Monster · Nahant, Massachusetts · 1837
Four gentlemen fishing near Nahant reported seeing a large dark sea serpent with four bunches on its back for about fifteen minutes.

Water Monster · Penobscot County, Maine · 1835
Capt. Little of the U.S. Navy reported seeing a sea serpent at sunrise in Penobscot Bay from a public armed ship.

Water Monster · Nahant, Massachusetts · 1833
A passenger on the Steamer Connecticut provided a detailed account of sea serpents lying on the water with heads resembling pickerels.

Water Monster · Portland, Maine · 1833
A witness reported passing among a shoal of sea serpents measuring 80 to 130 feet long, which lifted their heads and showed snake-like undulations.

Water Monster · Portsmouth, New Hampshire · 1831
A sea serpent was reported seen off Portsmouth, N.H.

Water Monster · Portsmouth, New Hampshire · 1831
A sea serpent was reported seen off Portsmouth, N.H.

Water Monster · Portsmouth, New Hampshire · 1831
A sea serpent was reported seen off Portsmouth.

Water Monster · Québec, Québec · 1835
A large creature claimed to be a sea serpent is exhibited in Brock street, Quebec, described as having a small head, blunt muzzle, and spiracle.

Water Monster · Nahant, Massachusetts · 1833
Witnesses report that numerous ocean travelers and one ship captain saw and watched a 60 or 70-foot sea serpent for an hour off Nahant in 1833.

Water Monster · Nahant, Massachusetts · 1834
Witnesses on the Portsmouth Packet report seeing a large sea serpent near Nahant that withdrew beneath the surface.

Water Monster · Nahant, Massachusetts · 1833
Passengers on the steamer Connecticut reported seeing three or four sea serpents near Nahant, with one estimated at 100 feet long.

Water Monster · Cape of Good Hope, Western Cape · 1838
The crew of her majesty's ship Daedalus sighted a large serpent passing close to the ship in October 1838.

Water Monster · Nantucket Island, Massachusetts · 1839
Witness reports a sea serpent one hundred and thirty-five feet long was seen off Nantucket, Nahant, and Salem.

Water Monster · Nahant, Massachusetts · 1839
Captain Sturgis reports that he and his crew saw a marine monster off Nahant which sank into the water after remaining in sight for a few minutes.

Water Monster · Nahant, Massachusetts · 1837
The text reports that a Sea Serpent was seen at Nahant, though it sarcastically suggests this may be due to editors being intoxicated.

Water Monster · Detroit River International Wildlife Refuge, Michigan · 1835
Witness reports a regular built Snake of male appearance, seventy five feet in length with hunches, floating down the Detroit river with its head elevated.

Water Monster · Harpswell, Maine · 1835
Witnesses report seeing a Sea Serpent in the bay between Portland and Harpswell on July 9, noting its head above water and undulating motion.

Water Monster · Nahant, Massachusetts · 1833
Witnesses on the steamer Connecticut report seeing a large serpent-like creature in the harbor that passed under the boat's stern.

Water Monster · Montréal, Québec · 1835
Witness reports a large serpent-like monster struggling against the current in the St. Lawrence River near Montreal for several days.

Water Monster · Suffolk County, Massachusetts · 1839
Witness reports that Lieut. John Bubier observed a large, fish-like creature with protuberances and a barrel-sized head while sailing near Boston harbor.

Water Monster · Knox County, Maine · 1834
Witness reports a large sea serpent was seen for several days near Cape Rosier, carrying its head above water and passing under a boat.

Water Monster · Race Point, Massachusetts · 1835
Captain Shibles and his crew reported seeing a large sea serpent with a mane-like neck near Race Point light. Witness reports the creature was 200 to 250 feet long, moved swiftly backwards and…

Water Monster · Hampton Beach, New Hampshire · 1831
Witness reports a large dark sea monster with protuberances along its back was observed for fifteen minutes near the beach.

Water Monster · Kennebunk, Maine · 1830
Three men fishing off the coast of Kennebunk reported seeing a sea serpent in 1830, with one witness later making oath to its size.

Water Monster · 1834
Three fishermen reported seeing a brownish sea serpent seventy feet long near the surface; one witness had a good view as it raised its head.

Water Monster · Alexandria, Virginia · 1839
The Boston Transcript reports that Captain Sturgis of a Revenue Cutter claimed to have seen an animal near his vessel that corresponded with accounts of the sea serpent, though he did not identify it…

Water Monster · Raleigh, North Carolina · 1839
A narrative describes a Major looking back at a Sea Serpent while on a steamboat.

Water Monster · Norway · 1837
A credible man and his two sons saw a serpent near Storfosen in 1837 that followed their boat.

Water Monster · Staunton, Virginia · 1831
Witness reports newspapers of Drontheini in 1831 stated the serpent has been seen at various parts of the coast.

Water Monster · 1833
Three Maine fishermen encountered a sea serpent basking near the surface in 1833; one fisherman had a good view as it raised its head and looked at him.

Water Monster · Indiana · 1838
Witness reports that Mr. [name] saw an animal with a head three or four feet above the water, described as having a serpent-like neck and yellow spots.