| 100% | DAM | 3 | Construction that stops a river's flow |
| 81% | DAM | 3 | Something that stops a river's flow |
| 63% | DAM | 3 | Barrier that blocks a river's flow |
| 51% | SEINE | 5 | Next stop: France! You can go take a ferry ride on this major river that flows through France (1/3) |
| 51% | STAGNANT | 8 | Like a river that has stopped moving |
| 49% | DAM | 3 | Something that stops the flow of water in a stream |
| 49% | DAM | 3 | It can obstruct a river's flow |
| 49% | DAMMING | 7 | Blocking a river's flow |
| 48% | TRIBUTARY | 9 | River or stream that flows into a larger river |
| 45% | BREAKERS | 8 | Devices that automatically stop the flow of current in a circuit |
| 45% | DAM | 3 | Structure that blocks a river's current |
| 44% | DAMSUP | 6 | Stops from flowing, as a river: 2 wds. |
| 44% | TKO | 3 | Referee's call that stops a boxing match: Abbr. |
| 43% | WHOA | 4 | Command that stops a horse |
| 43% | BRAKE | 5 | Pedal that stops a car |
| 43% | ESC | 3 | Key that stops a process |
| 43% | STEM | 4 | Stop a flow |
| 43% | WEIR | 4 | A low dam in a river that regulates its flow |
| 43% | VLTAVA | 6 | River that flows under Prague's Charles Bridge |
| 42% | STYX | 4 | River that's reimagined as a wall in "Hadestown" |
| 42% | CAR | 3 | Word that stops a street hockey game |
| 42% | TKO | 3 | Decision that stops a boxing match: Abbr. |
| 41% | URAL | 4 | River that's a letter off from 20-Across |
| 41% | OHIO | 4 | River that flows alongside 39-Across's hometown of Louisville, Kentucky |
| 40% | TRIBUTARY | 9 | A river flowing into a larger river |
| 40% | DAMS | 4 | Structures that stop river currents |
| 40% | OUSE | 4 | River in England that flows to the Wash near King's Lynn |
| 40% | TIRE | 4 | Race car part that's changed during a pit stop |
| 40% | AGRA | 4 | City that's a stop on the Taj Express |
| 39% | STANCH | 6 | Stop, as a flow |