| Weirs |
| Blocks |
| Stops up |
| Barriers |
| Obstructs |
| Blocks up |
| Holds back |
| Blocks off |
| Broodmares |
| Bottles up |
| Rain checks |
| Water gates |
| Hoover, etc. |
| T.V.A. works |
| T.V.A. units |
| Sires' mates |
| Farm mothers |
| Power sources |
| Water holders |
| Creek blocker |
| Hoover et al. |
| Lake creators |
| Holds in check |
| Flood stoppers |
| Beavers' works |
| Equine mothers |
| Flood controls |
| Mica and Tobin |
| TVA structures |
| Water blockers |
| Animal mothers |
| Creek blockers |
| River projects |
| River stoppers |
| Female parents |
| Water barriers |
| River barriers |
| River blockers |
| Beaver products |
| Beavers' prides |
| Oahe and Owyhee |
| Beaver barriers |
| Beaver projects |
| They hold water |
| Aswan and Kariba |
| Broodmares, e.g. |
| Emulates beavers |
| Four-footed moms |
| Water containers |
| Hoover and Aswan |
| Beaver creations |
| River regulators |
| Beaver structures |
| Beavers' barriers |
| Beavers' projects |
| Boulder and Aswan |
| Some farm mothers |
| Moms on all fours |
| Beavers make them |
| Hoover and others |
| Beavers' handiwork |
| Coulee and Boulder |
| Creek constrictors |
| Hoover and Ataturk |
| Keeps from running |
| Beavers build them |
| Beavers' blockades |
| Beavers' creations |
| Beavers' structures |
| Coolidge and Hoover |
| Cougar and Oroville |
| Four-footed parents |
| Oroville and Coulee |
| Reservoir producers |
| They may make lakes |
| Water flow stoppers |
| Works like a beaver |
| Beavers' constructs |
| Fish ladder locales |
| Four-footed mothers |
| Some female parents |
| Beaver-made barriers |
| Blockades, of a sort |
| Fish ladder settings |
| Projects for beavers |
| Beaver constructions |
| Hoover and Roosevelt |
| Hoover and Mossyrock |
| Roosevelt and Hoover |
| Some power producers |
| Anti-flood structures |
| Beaver-built barriers |
| Challenges for salmon |
| Lake makers, at times |
| Man-made lake formers |
| Oahe, Oroville et al. |
| Hydropower structures |
| Public works projects |
| Bonneville and Hoover |
| Aswan and Hoover, e.g. |
| Beaver-built blockades |
| Beaver-built blockages |
| Beavers construct them |
| Creators of reservoirs |
| San Luis and Fort Peck |
| Electricity generators |
| Beavers' constructions |
| Hydroelectric projects |
| Hungry Horse and Hoover |
| Steeplechasers' mothers |
| Don Pedro and Yellowtail |
| Hoover and Boulder, e.g. |
| Hydroelectricity sources |
| Some four-footed mothers |
| Some four-footed parents |
| Hydroelectric structures |
| River-blocking structures |
| Hydroelectricity projects |
| Civil engineering projects |
| Hoover and Roosevelt, e.g. |
| Hungry Horse and Mossyrock |
| Hydroelectric constructions |
| Sources of some electricity |
| Creators of artificial lakes |
| Glen Canyon and Grand Coulee |
| Hydroelectric power projects |
| Hoover and Three Gorges, e.g. |
| Roosevelt, Wilson, and Hoover |
| Bureau of Reclamation projects |
| Hydroelectric power facilities |
| Barriers constructed by beavers |
| Prevents from running, in a way |
| They supply hydroelectric power |
| They may cause course reductions? |
| Glen Canyon and Grand Coulee, e.g. |
| James Gardiner andBill Bennett constructions |