Lashinda Demus of Long Beach Wilson High School, Long Beach CA set the National High School record in the 300 hurdles at the CIF California State Meet in 2001 at 39.98In 2011, she was the World Champion at 400 hurdles and won the silver medal at the 2012 Olympics.
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300 Hurdles means 300 meter hurdles. 300 meters is equivalent to 328.084 yards. Women's hurdles are 30 inches tall (Men's are 36").