Question

how do fish ladders work? who maintains the mcnary dam? (hint---the same organization as summersville dam?)

Explanation:

Fish ladders work by creating a series of small - step pools that allow fish to bypass dams and other barriers by swimming up in a series of short, less - strenuous jumps. As for the maintenance of McNary Dam, without specific knowledge about the maintenance of Summersville Dam, it's hard to give a definite answer. However, in the United States, many large dams are maintained by federal agencies such as the U.S. Army Corps of Engineers.

Answer:

Fish ladders create a series of small - step pools for fish to bypass barriers. Regarding McNary Dam maintenance, it could potentially be a federal agency like the U.S. Army Corps of Engineers (but more information is needed for certainty).