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Marine Mammal Center Monitors Rare Humpback Whale CRC-11620

By Drooid · Sep 18, 2026, 3:19 PM UTC · How we work

Summary

Story summary

The Marine Mammal Center is monitoring adult humpback whale CRC-11620 in the Sacramento Delta.
CRC-11620 has been recorded 15 times over 24 years in California and Mexico.
The whale was first reported in San Francisco Bay on Sept. 15, then passed the Richmond-San Rafael Bridge.
Witnesses saw the whale near the Rio Vista Bridge on Sept. 17.
Kathi George urged the public to keep distance while scientists assess the whale’s health.

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Story summary

The Marine Mammal Center is monitoring adult humpback whale CRC-11620 in the Sacramento Delta.
CRC-11620 has been recorded 15 times over 24 years in California and Mexico.
The whale was first reported in San Francisco Bay on Sept. 15, then passed the Richmond-San Rafael Bridge.
Witnesses saw the whale near the Rio Vista Bridge on Sept. 17.
Kathi George urged the public to keep distance while scientists assess the whale’s health.