More than a mile long, the Grand Coulee Dam is the largest concrete structure in the U.S. In the fall of 2011, dam operators agreed to open the spillway just for American Experience. "It was very ...

The Morning Glory spillway — dubbed by locals as the "Glory Hole spillway" — at Lake Berryessa in Napa, Calif., is active for the first time since 2019, Jennifer Onufer of the Bureau of ...