Explaining the dark lines on the Oroville Spillway

SACRAMENTO, Calif. (KCRA) —

LiveCopter 3 noticed dark horizontal lines while flying over the Oroville Dam’s spillway on Wednesday.

The California Department of Water Resources said the dark horizontal lines are the result of a sealant used to fill in joints created by metal expanders put in the spillway last year.

Get more in the video above

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