Levee breaches to improve river habitat

By STEVE KADEL

H&N Staff Writer

July 26, 2006

 

H&N photo by Andrew Mariman
Mark Stern, director of the Klamath Conservation Area, stands in a wetlands area he helped reclaim from farmland on Modoc Point. The marsh is six-years-old and is already seeing some vegetation growth.


MODOC POINT - Dust clouds rose from the Williamson River delta Tuesday afternoon as a hungry yellow excavator scooped up bite after bite of dirt near the stream.

With a scraper and dump truck in the same area, it looked like a highway was being built across the Nature Conservancy's Tulana Farms property.

Instead, the work marked early steps in a $10-million, multi-year project to help endangered suckers by improving Williamson River habitat.

The goal is to cut seven or eight breaches in the 27 miles of levee surrounding the property. An interior levee will be removed.

The changes should spur growth of bull rushes, willows, and other rushes and sedges juvenile suckers can feed on during their journey from spawning beds near Chiloquin Dam to Upper Klamath River.

Reclamation of the land 50 to 60 years ago has caused the river channel to straighten over time. That triggered a loss of sucker habitat, said Mark Stern, the Nature Conservancy's Klamath Basin director and program leader.

Plants help fish

A pilot project in 2002 and 2003 used the the same techniques, and results showed quick recovery of plants sought by the fish.

“They've seem tremendous use by larval suckers,” said Stern. “The formula really is ‘just add water.'”

The National Academy of Science endorsed the method as a way to help larval suckers, he added.

The schedule calls for 500,000 cubic yards of dirt to be moved this summer at a cost of $1.7 million. The total project involves moving 2 million cubic yards of material.

Besides breaching the levee in some spots, crews from LTM Inc. General Contractors of Medford will use heavy equipment to carve benches along both sides of the Williamson River. The 100-foot-wide benches, which will flood during May and June, will give juvenile fish added feeding sites and cover during their trip downstream.

Restoration benefits

Restoration will help suckers, Stern believes, and will add to water storage.

A recent $2 million grant from the Oregon Watershed Enhancement Board helped work get started. Funding also has come from the U.S. Fish and Wildlife Service, Bureau of Reclamation and Natural Resources Conservation Service.

The amount of wetland affected looks modest when viewed on a map. But driving the fields gives an entirely different feeling. The Nature Conservancy has 4,800 acres on its Tulana Farms and close to 7,500 acres in the entire restoration project.

“It's a big landscape,” Stern said. “That's why I'm hopeful it will have a big effect on the suckers.”



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