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Technically called the Morning Glory Hole spillway, the drainage pipe has been used only 25 times in its nearly 70-year history, according to the Solano County Water Agency, which utilizes water from the reservoir.

They have completed reports on 31 of those, including assessments of whether their spillways are big enough to handle a flood.

Next to the lake, a spillway flows into a stream that the Department of Water Resources refers to as Blue Canyon Creek.

Some of what they remove will be used to fill in the dam’s emergency spillway which is carved into the rock beside the river.

Opening the spillway diverts Mississippi River water to Lake Pontchartrain and Lake Borgne, after which it flows to the Mississippi Sound in the Gulf of Mexico.