obstructions

• A riverboat pilot had to be able to read the surface of the river and know which ripples and waves indicated a problem and which didn't, which submerged obstructions were their last trip, and which were not. —  AnalogSFF,November2007
• He dragged the lake to make sure there were no floating obstructions, then brought the ship in and set it down Dartlic pointed excitedly. —  163 - The Exploding Lake
• Seeing the way ahead to be clear of obstructions, they pulled their sledges another mile or so uphill by starlight, then collapsed from exhaustion. —  Analog December, 1974
• Sand, stones, anchors, and other obstructions were heaped upon the track. —  History of the United States, Volume 3 (of 6)
• The Chinese having neglected to remove the obstructions, after the admirals had waited several days, Mr Bruce and the French ambassador having arrived, the admiral sent in to say that unless his demands were immediately complied with he should force his way. —  How Britannia Came to Rule the Waves Updated to 1900

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