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
Robert C. Byrd Locks and Dam Gallipolis Ferry, West Virginia 279.2 LDB 23 41.7
Greenup Locks and Dam Greenup, Kentucky 341.0 LDB 30 61.8
Captain Anthony Meldahl Locks and Dam Foster, Kentucky 436.2 RDB 30 95.2
Markland Locks and Dam Warsaw, Kentucky 531.5 LDB 35 95.3
McAlpine Locks and Dam Louisville, Kentucky 606.8 LDB 37 75.3
Cannelton Locks and Dam H Cannelton, Indiana 720.7 RDB 25 113.9
Newburgh Locks and Dam Newburgh, Indiana 776.1 RDB 16 55.4
John T. Myers Locks and Dam Mt. Vernon, Indiana 846.0 RDB 18 69.9
Smithland Locks and Dam H Hamletsburg, Illinois 918.5 RDB 22 72.5
Locks and Dam Number 52 Brookport, Illinois 938.9 RDB 12 20.4

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
Locks and Dam Number 53 Grand Chain, Illinois 962 RDB ≤17 23.7
Olmsted Locks and Dam Olmsted, Illinois 964.4 RDB ≤30 46.0

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 River Mile with a RDB lock face and a pool length of 55.4 under the list of Ohio River locks and dams?