After initial reports of a surge of 30-foot-deep water carrying mud, rock and debris — including cars — coming down Fourmile Canyon, officials said the water flow has flattened out to about seven feet.

At about 11:30 p.m. Thursday, a resident in Emerson Gulch reported the surge to Boulder County emergency officials.

But officials said the surge flattened out to about seven feet by the time it went through Fourmile Canyon and reached Boulder Canyon.

Boulder County spokeswoman Gabi Boerkircher said officials do not know how much of the debris was carried with the surge into Boulder Canyon. It is not known when or if the surge will make its way into the city.

Sarah Huntley, a city of Boulder spokeswoman, told Denver’s Channel 7 that the water level in Boulder Creek is starting to go back down, although it’s still very dangerous.