after finding the above book and doing google searches I found some related "back up" reports on same
California Sea Serpent Flap
California Sea Serpent Flap
During October and November 1983, several sightings of a dark, eel-like creature came from the California coast. (Stinson Beach, north of San Francisco, and Costa Mesa). Three humps (just like in the classic sea serpents on old maps) followed a small head, which rose above the surface to look around. Many individuals saw the serpent, some with binoculars. At Stinson Beach, the animals was followed by about 100 birds and two dozen sea lions.
(Anonymous; "'Sea Serpents' Seen off California Coast," International Society of Cryptozoology Newsletter, 2:9, Winter 1983.)
http://www.science-frontiers.com/sf033/sf033p12.htm
The sketch above is of a creature sighted many times since 1976 in the waters around San Francisco Bay. It has been sighted near Stinson beach and Agate Beach. A road crew spotted the creature in November 1983 at 2:30 pm from a cliff above the water. A description of the creature from a Stinson beach sightings stated the animal was about 100 ft long, 5 ft in diameter and black in color. It was observed trashing about and speeding around.
http://www.unmuseum.org/seasnake.htmSea Serpents have also been reported off the North American West Coast too. There have been many reports from along the Pacific coast near Vancouver of several different shaped creatures including a snake-like sea serpent. Further south more reports center around the city of San Fransico.
On November 1st, 1983, a construction crew was working on Route 1 just north of the Golden Gate Bridge near Stinson Beach. Suddenly they spotted a creature, underwater, approaching the land. They estimated the creature's length at 100 feet and it's diameter at five. Using binoculars they watched it making coils, throwing it's head about and whipping it's body around. http://theshadowlands.net/serpent2.htm
Two years later, in San Fransico bay, twins Robert and William Clark were sitting in a car near the sea wall. They watched two seals swimming extremely fast across the bay. Then they noticed a "large black snake-like" animal" chasing the seals. They saw that the creature moved by forming it's body into coils and wiggling up and down. The animal apparently also had small, translucent fan-like fins that acted as stabilizers.
California Sea Serpent Flap
California Sea Serpent Flap
During October and November 1983, several sightings of a dark, eel-like creature came from the California coast. (Stinson Beach, north of San Francisco, and Costa Mesa). Three humps (just like in the classic sea serpents on old maps) followed a small head, which rose above the surface to look around. Many individuals saw the serpent, some with binoculars. At Stinson Beach, the animals was followed by about 100 birds and two dozen sea lions.
(Anonymous; "'Sea Serpents' Seen off California Coast," International Society of Cryptozoology Newsletter, 2:9, Winter 1983.)
http://www.science-frontiers.com/sf033/sf033p12.htm