Trees Add To Levee Strength, But May Be Removed

Despite scientific findings that trees along levees help improve their effectiveness, federal regulations may require that trees lining levees in Central California be removed.

1 minute read

August 30, 2007, 7:00 AM PDT

By Nate Berg

"Though federal officials on Tuesday faced a deluge of evidence that trees do not threaten levees, they continued to tout their own policy that could require every mature tree to be cut down on Sacramento levees."

"32 Central Valley levee districts in February failed a maintenance inspection by the U.S. Army Corps of Engineers. Most failed because their levees had too many trees and shrubs."

"The corps, which is preparing a new national levee maintenance policy, currently says no vegetation larger than 2 inches in diameter should grow on a levee. But that standard has not been applied in California. In fact, the local district of the corps has worked for decades with local, state and federal agencies to plant more trees on levees."

"The issue affects levee managers nationwide, but it is especially critical in California, where levees provide virtually the only remaining riverside wildlife habitat."

FULL STORY: Scientists: Trees help, not hinder, levee safety

Wednesday, August 29, 2007 in The Sacramento Bee

Environment Infrastructure California

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