The following questions (1-10) are based on the Army Corps of Engineers Mississippi River Maps (Cairo to the Gulf) and the Light List. AHP = Above Head of Passes LMR = Lower Mississippi River UMR = Upper Mississippi River OHR = Ohio River ACOE = Army Corps of Engineers
At Filter Point Light mile 475 (AHP) there are 3 close straight dashed lines on the map passing through the black dot below the number 475. What do these lines represent?
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