Related Clues:

• Beaver's output
• Civil engineering project
• Thing beavers build
• Note something sticky in blockage
• First man heading off for weir?
• Fordham in Illinois
• Barrier with a spillway
• Impediment to progress
• Stop (up)
• Barrier on a waterway
• Fish ladder locale
• Hydro plant locale
• Deadlock; situation that seems insoluble
• Water flow stopper
• Reservoir structure