Boulders And Tree Trunks Could Help Save Winter-Run Chinook Salmon

SACRAMENTO (CBS13) — Massive cranes are lifting 6,000-pound boulders, bolted to giant tree trunks and placing them into the Sacramento River.
It is an unusual sight, and if all goes as planned, it could have the power to save Winter-run Chinook salmon from extinction.
The project looks like a floating construction site. A giant crane on top of a barge, pushed by a powerful tugboat, all working together to drop three-ton limestone boulders strapped with tree trunks to the riverbed below.
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