Gray whale found dead near Alcatraz highlights crowded, dangerous Bay

A gray whale drifted dead near Alcatraz Island this week, a grim sight in the shadow of one of San Francisco’s most recognizable landmarks and a fresh reminder that the Bay’s ferry lanes, tour routes and shipping traffic can be lethal for marine life. The whale was first spotted Monday by naturalist Mandy Hansen during a whale tour aboard the Kitty Kat, then seen near the island’s shoreline before floating out of reach.

Because the carcass drifted away, scientists could not recover it for a necropsy, leaving the exact cause of death unknown. The Marine Mammal Center said the body likely moved toward the South Bay or another beach and may eventually wash ashore. Bay Area whale strandings are handled by the Marine Mammal Center and the California Academy of Sciences under federal authorization from NOAA Fisheries, but recent responses have often been limited when carcasses end up offshore or in inaccessible water.

The death comes during an unusually busy whale season in San Francisco Bay. ABC7 San Francisco reported that on a normal day, four to five whales are typically seen, but sightings jumped to nine over the weekend. The Marine Mammal Center said nine whales had already died in Bay Area waters this year. That matters because ship strikes remain one of the leading causes of death for large whales on the California coast, especially in San Francisco Bay, where whales increasingly move through busy corridors used by commercial vessels, ferries and tour boats.

The problem is unfolding against a shrinking gray whale population. NOAA Fisheries said the eastern North Pacific gray whale estimate for 2025 was about 13,000, the lowest since the 1970s. In 2025, the Marine Mammal Center reported at least 21 gray whale strandings in the Bay Area, the highest in 25 years, and at least nine were suspected or probable ship strikes. ABC7 also reported that 33 gray whales were sighted in San Francisco Bay in 2025, compared with only six in 2024.

California expanded its speed-reduction effort last year through Assembly Bill 14, signed in October 2024, which broadened the Protecting Blue Whales and Blue Skies program statewide. Under the program, oceangoing vessels of 300 gross registered tons or larger are asked to travel at 10 knots or less in vessel speed reduction zones. Even with more than 40 participating operators, the latest dead whale near Alcatraz shows how easily a single strike can erase a giant animal before scientists can even determine what happened.