| 21. | Icebreakers were built in order to maintain the river free of ice jam, east of Montr�al.
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| 22. | Fortunately for Columbus, an ice jam destroyed the Lost Creek bridge in the spring of 1881.
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| 23. | In the early season ( June ), boaters may encounter ice jams anywhere along the river.
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| 24. | Massive ice jams clogged the Missouri River and when they broke the downstream areas were ravaged.
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| 25. | These ice jams can cause considerable damage to structures along the riverbanks and on the floodplain.
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| 26. | On Wednesday, demolition experts broke up an ice jam 65 kilometers ( 40 miles ) upstream.
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| 27. | In March 1901, flooding and ice jams severely damaged a number of bridges over Mahantango Creek.
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| 28. | Workers north of Fargo returned to work Tuesday trying to break up a mile-long ice jam.
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| 29. | In 1961, a severe ice jam threatened to destroy the bridge, but the jam was successfully dynamited.
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| 30. | On the other hand, sudden releases from ice jams that abruptly dislodge can send floodwaters rushing downstream.
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