From the Eagle Valley Enterprise via Vail Daily (Derek Franz):
The storm ponds are the main concern, however. They are a filtration system for water going back into Brush Creek from the Eagle Ranch development. By flowing from one pond to the next, pollutants such as fertilizers and petroleum are strained from the water before it goes into the creek.
“The beavers had raised the water level of the ponds a little more than a foot over the weekend,” Boyd said last week. “I noticed that some sticks and debris from the bottom of the pond were piled over the grate (where water drained from one pond to the next).” The beavers were damming the outlets of the last two ponds. The final pond is only separated from Brush Creek by a narrow berm.
“At that rate, it wouldn’t be long before the pond water washed out the berm and went straight into the creek,” Boyd said.
The final pond is very clean, but it wouldn’t be that way if the pond above it washed out, as well.
More restoration/reclamation coverage here.