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Interesting that you ask about dams far upstream, but not upstream culverts. Ours goes under a road about half mile upstream so has a culvert. Is it because a dam blocks but a culvert only narrows flow?
Interesting that you ask about dams far upstream, but not upstream culverts. Ours goes under a road about half mile upstream so has a culvert. Is it because a dam blocks but a culvert only narrows flow?