Imagine a six-inch-thick, high-voltage electricity transmission line running underwater on the bottom of the Columbia River, from just east of The Dalles, Ore., to Portland. The line carries ...

From that lake, which covers more than a dozen kilometres of a trench that carves north-south through the Rocky Mountains, runs the Columbia River, the mightiest waterway in the Pacific Northwest.

Last year, Biden’s administration reached a tentative three-year agreement with Canadian officials to renew the Columbia River Treaty, which governs flood control and hydropower sharing between ...