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<br />D. <br /> <br />Results of national screening for scour vulnerability, As of April 15, <br />1995, 97,8% of the 483,158 bridges over streams or rivers helve been <br />screened into the following categories: <br /> <br />C",yy~n'r "'~ on <br /> <br />SOD .---r <br />')'.'co ~ <br />I" <br /> <br /> 3-) -00 <br />Category Number of Percentage <br />Bridges <br />Evaluation Complete <br />Low risk culverts 97,215 107 e>oo 20,1 <br />Low risk bridges 106,156 ~).. ,>-0 OtJ 22.0 <br />Scour critical 7,105 ,}.'-I/OO 1.5 <br />Evaluation Needed <br />Screened low risk 79,932 15;8;00 16.5 <br />Scour susceptible 76,429 3.2,Qa? 15,8 <br />Not screened 10,696 too 2.2 <br />Evaluation Deferred <br />Unknown foundations 105,625 UOOO 21.9 <br /> <br />E. Video of the Schoharie Creek bridge failure (April 5, 1987) illustrates the <br />catastrophic results of instantaneous bridge failure due to scour and <br />accompanying tragic loss of life, Note: We will use the Schoharie Creek <br />failure as a detailed case study later in the course (Lesson 20). <br /> <br />NOTES: <br /> <br />1,2 <br />