The rarely used Morganza Spillway may be opened soon as the Mississippi River continues to swell.

Just a week ago, U.S. Army Corps of Engineers said they had "no intention" of opening the flood control structure. As more rain has fallen in the Midwest, however, the chances of utilizing the spillway to relieve the Mississippi have increased.

STORY: Chances of historic Morganza Spillway opening are rising due to weather, officials say

As discussions continue about opening the spillway, here are key facts to know about the history and potential use of the Morganza Spillway.