According to National Weather Service records, 2.21 inches of rain have fallen in Charleston since July 19.
Upon inspection, the Division of Highways found no other weak points in the hillside that could cause another fall.
"There's nothing that gives us cause for concern," Walker said.
Thursday's event isn't the only slide to disrupt traffic recently.
Just this week, highway officials decided to close a section of W.Va. 10 between Man and Logan because construction work on an adjacent hill caused the hill to become unstable. Earlier this month, a father and son were injured after a rock fell on their vehicle from the hill.
In March, a large rockslide shut down the northbound lanes of I-77 near Bluefield for an entire week.
Walker said that rockslides and rock falls are a natural part of living and driving in a mountainous state.
"San Francisco has their earthquakes, and we have slips and slides," he said.
Contact writer Matt Murphy at Matt.Mur...@dailymail.com or 304-348-4817.