A new agreement paves the way for the largest dam demolition in U.S. history. If the deal announced Tuesday goes forward, it would revive plans to remove four hydroelectric dams on the Klamath River along the Oregon-California border, reopening 400 miles of the river and its tributaries to salmon spawning for the first time in more than a century. It would also eliminate masses of toxic blue-green algae that thrive in the stagnate waters. The Klamath Settlement Agreement was forged 10 years ago between native tribes, farmers, conservation and fishing groups, government agencies and PacifiCorp, which owns the dams. PacifiCorp has been pushing to transfer ownership to a non-profit commission established to oversee the removal of the dams, an already-funded $450 Million project. In July the Federal Energy Regulatory Commission demanded that PacifiCorp remain a co-licensee. The new plan makes Oregon and California equal partners in the demolition with the nonprofit entity, easing concerns raised by FERC. The plan still must be approved by the U.S. Government, and Congressman Doug LaMalfa has again vowed to fight removal of the dams, saying the electricity and water storage are needed, and insisting that the project will be plagued by cost overruns.