U.S. begins spillway gate rehabilitation at 80-MW Green Peter Dam

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U.S. begins spillway gate rehabilitation at 80-MW Green Peter Dam

From – Hydro Review

The U.S. Army Corps of Engineers has begun rehabilitation of one of two spillway gates at the 80-MW Green Peter hydroelectric project on Oregon’s South Santiam River.

Intended to improve the dam’s ability to reduce flood damage on the South Santiam, work is to include strengthening the gate face; replacing the gate’s arms, trunnion pins and wire ropes; and replacing or refurbishing electrical controls, gearboxes and other systems.

The Corps’ Portland District awarded a $3.5 million contract in 2013 to Knight Construction & Supply Inc. for the tainter gate rehabilitation work. The work is similar to that performed on spillway gates at 40-MW Foster Dam in 2008-2009.

The Corps said public restrictions to the Green Peter Dam area would begin with mobilization of construction crews Sept. 15.

Crews are to pin the spillway gate face in place to hold back water, but Corps reservoir regulators are aggressively to manage the reservoir’s elevation to keep the gate unwatered as much as possible. That might result in higher flows for longer durations downstream following significant rains. The Corps said its goal is to keep the river below flood stage.

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