More than a century ago, the Klamath River was home to the third largest run of Chinook salmon in the continental United States. These seasonal runs of fish historically numbered in the hundreds of thousands. But today, more than 100 years after the first dam went up on the Klamath, those runs that once seemed inexhaustible are almost gone. Last year, fewer than 700 chinook salmon returned to the Klamath. Just two years prior, dismal returns forced officials to close salmon fishing season entirely.