Barge Landing on Diablo Lake Reaches Milestone

A construction crew installs a pre-cast concrete section for the heavy barge landing at Diablo Lake.

Seattle City Light’s contractor for a heavy barge landing dock on Diablo Lake at the utility’s Skagit Hydroelectric Project has reached an important milestone.

Last week, the contractor set pre-cast concrete panels for the barge landing, which is one of the biggest components of the job. Remaining tasks include tightening the panels together, patching any openings, adding handrails and bumpers, and final road grading.

This $1.5 million project is one of the final phases of work needed to replace facilities destroyed by a 2010 rock slide.

City Light uses barges to carry heavy equipment across Diablo Lake to and from its Ross Dam and Powerhouse. The project must be completed to allow for the delivery of six new transformers to Ross Powerhouse scheduled for 2016.

Diablo Lake was lowered about 10 feet for some of the earlier work. It is now back in its regular operating range.

Seattle City Light is the 10th largest public electric utility in the United States. It has some of the lowest cost customer rates of any urban utility, providing reliable, renewable and environmentally responsible power to about 750,000 Seattle area residents. City Light has been greenhouse gas neutral since 2005, the first electric utility in the nation to achieve that distinction.

Workers install a pre-cast concrete section of the heavy barge landing.

Construction Crews Make Progress on Diablo Lake Barge Landing

Construction crews continue to make progress on a project to build a permanent replacement for a barge landing on Diablo Lake at our Skagit Hydroelectric Project.

City Light crews finished rockeries for the landing and have placed more than 75 percent of the concrete planks for the lower road to the landing.

Concrete planks installed at the barge landing.

A contractor is installing a rock fall barrier in the area.

This barrier being installed is designed to catch rocks that could fall from the cliff face above the Diablo Lake barge landing area.

The project team anticipates moving the east ferry landing dock and replacing the National Park Service dock next week (July 13-17). The exact date will be chosen to minimize impacts to visitors.

City Light’s heavy barge landing and the road that led to it were damaged by a rock slide in 2010. Barges are needed to carry heavy equipment to and from Ross Dam and Powerhouse. The barge landing replacement project will allow City Light to perform planned maintenance on large transformers and other equipment.

The final phase of the project will require the water level of Diablo Lake to be lowered so the new ramp can be built. That drawdown is scheduled Sept. 15.