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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
Chinook salmon haven't been able to reach the McCloud River since 1942, when the construction of Shasta Dam blocked the fish from swimming upstream in the Sacramento River and sealed off their spawning areas, leaving the population in decline.
Source: https://phys.org/news/2023-05-tribe-pact-california-efforts-endangered.html