Table:
text: List of locks and dams of the Ohio River
Downstream, Pittsburgh to Olmsted
Downstream, Pittsburgh to Olmsted
Locks_Dam Location_L_ River_Mile Lock_Side Lock_Lift_Drop_in_feet Pool_Length_miles
Emsworth Locks and Dam Pittsburgh, Pennsylvania 6.2 RDB 18 6.2+
Dashields Locks and Dam Coraopolis, Pennsylvania 13.3 LDB 10 7.1
Montgomery Locks and Dam Monaca, Pennsylvania 31.7 LDB 18 18.4
New Cumberland Locks and Dam Stratton, Ohio 54.3 RDB 21 22.6
Pike Island Locks and Dam Wheeling, West Virginia 84.2 LDB 21 29.9
Hannibal Locks and Dam Hannibal, Ohio 126.4 RDB 21 42.2
Willow Island Locks and Dam H Newport, Ohio 161.7 RDB 20 35.3
Belleville Locks and Dam Reedsville, Ohio 203.9 RDB 22 42.2
Racine Locks and Dam Letart, West Virginia 237.5 LDB 22 33.6

Question: What is the tallest river mile with a basin length of 42.2 miles or a lock/elevator drop of 21 feet under the list of Ohio River locks and dams?