The Aporia · Massive humpback whale makes rare appearance in California river

Massive humpback whale makes rare appearance in California river

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Jerkovich, K. (2026, September 18). Massive humpback whale makes rare appearance in California river. New York Post. https://nypost.com/2026/09/18/us-news/massive-humpback-whale-makes-rare-appearance-in-california-river/

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Quick Summary

Fishermen near Sacramento River witnessed a rare sight: a large humpback whale breaching the water. Denny Glover and his friends captured video of the event, confirming it was indeed a humpback after seeing multiple spouts of water. Identified by researchers as CRC-11620 or "Rio," this specific whale has been tracked over 15 times since 2002 in unusual locations off the California coast and Mexico, most recently seen swimming into the San Francisco Bay and then the Sacramento-San Joaquin River Delta. The Marine Mammal Center advises keeping a respectful distance from Rio to allow it freedom of movement.

Written by AI on 2026-09-19, from this article's own text only (the story summary below draws on all the coverage).

AI analysis

Story summary

On September 18, 2026, fisherman Denny Glover and his friends spotted an adult humpback whale in the Sacramento River near Rio Vista Bridge, about 60 miles from the Pacific Ocean. Initially unsure of what they were seeing, they soon confirmed it was a fully grown humpback after observing its distinct spouting pattern and massive size, which far exceeded their 21-foot boat's length. This sighting is significant as it marks one of the rare instances of a humpback whale appearing so far inland in California.

The whale has been identified by the Marine Mammal Center as CRC-11620 and named Rio. The center advises that while the whale’s health condition remains unclear, the public should maintain a respectful distance to avoid stressing the animal further. Experts are studying this unusual behavior to determine whether the whale is simply exploring new waters or if there might be an underlying medical issue.

The sighting has garnered significant attention from marine biologists and wildlife enthusiasts alike, highlighting the need for responsible observation of such rare occurrences in inland waterways.

Written for “Whale In California River” on 2026-11-02, grounded in this article and the 3 other(s) covering the same event.

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sentences that state something as happening or true

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0 of 19 hedged ("reportedly", "may", "according to")

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takes no side on a contested political question

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66/100

New York Post's corrections and hedging, across everything collected from it. Not a measure of accuracy.

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Who wrote this

Katie Jerkovich

57 article(s) here · 0 carrying a prediction

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Also by Katie Jerkovich

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Nothing else under this byline is closely related to this article, so these are simply their most recent.

All 57 articles by Katie Jerkovich →

Claims (19 extracted, 0 hedged)

A group of fisherman in the Sacramento River had an unbelievable run-in when a massive humpback whale appeared in the waterway. asserted

whale → have → waterway

Denny Glover said he and his pals were on a fishing trip south of the Rio Vista Bridge Wednesday when one of them spotted spray from the water. asserted

one → say → water

“I honestly, I didn’t believe it. asserted

I → believe → it

I thought he had mistaken a dolphin or porpoise or whatever,” Glover told KCRA. asserted

Glover → think → KCRA

“I just didn’t believe him.” Sign up for the California Morning Report newsletter The biggest news, opinion and culture shaping California right now. asserted

I → believe → California

Glover said when the spray appeared a second time, there was no doubt “it was a whale.” asserted

it → say → ?

“Then we saw another spout and there’s no mistaking the size of a whale spout. asserted

we → see → spout

When it blows when it comes up it’s a big mist of water,” he explained. asserted

he → blow → water

“Just the part of the whale that breached was longer than our 21-foot boat.” asserted

that → breach → boat

The fisherman managed to capture video of the sighting with his phone, showing the whale swimming in the river delta. asserted

whale → manage → delta

It’s not the first time the humpback has been spotted off course. asserted

humpback → ’ → course

The giant whale has been identified by the Marine Mammal Center as CRC-11620 and named Rio, the center told the California Post. asserted

center → identify → Post

Its movements have been studied by researchers in the area for more than two decades. asserted

movements → study → decades

There’s been documented sightings of CRC-11620 15 times in the last 24 years as it traveled off the California and Mexico coast, with the first sighting in 2002 off the coast of California. asserted

it → document → California

Earlier this week, it was spotted in the San Francisco Bay before making its way east into the Sacramento-San Joaquin River Delta. asserted

it → spot → Delta

The Marine Mammal Center confirmed the sighting, stressing the importance of the public to keep their distance. “While it’s unknown whether this whale is just passing through or if there is an underlying, unknown ailment, the best thing people can do is experience this adult whale’s presence from a respectful distance,” Kathi George, Director of Cetacean Conservation Biology at The Marine Mammal Center, told the Post. asserted

George → confirm → Post

Our team is actively monitoring the situation, and we kindly ask the public to please avoid changing the whale’s course and let the animal decide where it wants to go. asserted

it → monitor → course

In 1985, a whale named Humphrey spent several weeks in the Rio Vista area, capturing national attention before making its way back to the ocean. asserted

whale → name → ocean

In 2007, mother and calf humpback whales — Delta and Dawn — excited observers in the area for 20 days before getting back on course. asserted

whales → excite → course

Massive humpback whale makes rare appearance in California river

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Claims (19 extracted, 0 hedged)