0
Best 0
Streak
x1
Shift 1
WAITING FOR BOATS
INTERLOCK BYPASS
Upstream gate
OPEN
A
▲
▼
Downstream gate
CLOSED
D
Keokuk, Iowa · Lock & Dam 19
LOCK
MASTER
Raise and lower the Mississippi. Keep the river moving.
Gates
open only when the chamber matches that pool
▲ ▼
fill or drain with both gates shut
Boats lose patience. Fast, full lockages pay best
Tap to start
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