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Table 4. Percentage of channel blocked by drift at selected scour-potential-study bridges.

Percentage of channel blocked Number of selected bridges, by State
Greater than Less than or equal to Indiana Maryland Massachusetts South Carolina Tennessee
75 100 3 1 0 35 6
50 75 2 1 0 28 18
25 50 28 7 1 100 74
5 25 104 51 16 409 282
0 5 133 62 37 481 422
0 2,124 757 702 2,445 2,779
Total number of bridges 2,394 879 756 3,498 3,581

Percentage of channel blocked Percentage of selected bridges, by State
Greater than Less than or equal to Indiana Maryland Massachusetts South Carolina Tennessee
75 100 0.1 0.1 0.0 1.0 0.2
50 75 0.1 0.1 0.0 0.8 0.5
25 50 1.2 0.8 0.1 2.9 2.1
5 25 4.3 5.8 2.1 11.7 7.9
0 5 5.6 7.1 4.9 13.8 11.8
0 88.7 86.1 92.9 69.8 77.5
Total of percentages of bridges 100.0 100.0 100.0 100.0 100.0

U.S. Department of the Interior, U.S. Geological Survey
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Last update: Tuesday, 08-Jan-2013 14:46:25 EST
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