| Clue | Source | Date |
|---|---|---|
| Winter river flow blocker | Wall Street Journal | 02 Jun 2022 |
| It may delay river traffic | The Washington Post | 25 Nov 2017 |
| It may delay river traffic | LA Times Daily | 25 Nov 2017 |
| It may delay river traffic | ||
| Winter's river blockage | ||
| Winter river obstruction | ||
| Berg block |