CLE ELUM — A white SUV pulled up to a gravelly stop in front of the entrance to the Cle Elum Reservoir, and a man wearing a NorthFace jacket got out. He ambled over to a Bureau of Reclamation employee wearing a hard hat and a neon orange vest.
“You look like someone who knows what’s going on,” the man said. “Is there any good place to unload a bunch of kids who want to see the dam?”
The Reclamation employee in the vest — Richard Visser, of the Pacific Northwest Region Columbia-Cascades Area Office — thought for a moment.
“No,” Visser said. “This is an active, hazardous construction site.”
But within years, officials hope the site will provide a safe harbor and spawning ground for the fish stocks that once inhabited the lake in abundance: sockeye, coho, and spring chinook salmon, Pacific lamprey, upper Middle Columbia River steelhead and bull trout.
The construction of the Cle Elum Fish Passage Facility is one of six reservoir fish passage projects outlined in the Yakima Basin integrated water management plan, a 30-year, multibillion-dollar project to add water storage, improve fish passage and restore river flows in Kittitas, Yakima and Benton counties.
The facility, once complete, will help restore biodiversity and natural production of salmon and other fish species in the upper Cle Elum subbasin. It will also help reconnect isolated populations of bull trout.
Beyond the two men, a contracted crew operated a giant drill, boring into the soil, making room for the concrete that would be siphoned down to stabilize the earth for a fish passage tunnel. In the foreground, the visitor was interested. He asked about the kind of fish passage being used and rattled off a short list of possibilities.
“It’s ... complicated,” Visser answered. “It’s none of those. It’s a helix.”
Not only is the project at Cle Elum Reservoir the first major fish passage facility undertaken in the water plan, it’s also the first project in the state to use the innovative, custom-designed “helix” architecture.
Visser described the helix construction as similar in design to a big parking garage in Seattle, a description the man accepted before returning to his SUV to look for a hiking trail in the surrounding forest.
As they spoke, the drills continued boring in the background, taking the massive $200 million project one day closer to completion, a date anticipated, at the earliest, for 2023 or 2024.
A bus carrying about 20 employees from the Washington Department of Ecology, the Washington Department of Fish and Wildlife and the Yakama Nation also stopped at the site.
Tom Tebb, the director of the Office of Columbia River for Ecology, said staff take an annual field trip away from their offices, with the piles of paperwork that inform project plans, to see the project sites for themselves.
“We’re really excited about this project and the design,” Tebb said. “This is the most challenging of the fish passage facility projects. We decided if we were going to build this, we were going to build it right.”
Visser gestured at a colorful cutout as he explained the schematics of the Cle Elum fish passage to the group.
Juvenile fish first enter a series of tiered intake gates, which span a vertical height of about 64 feet to accommodate for differing water levels in the reservoir.
Once juvenile fish swim into the intake gate, they are channeled through the helix structure to an underground passage tunnel, which connects the fish to an adult fish collection “trap and haul” facility — so called because adult fish will then be hauled, via truck, for release into the Cle Elum Reservoir or upstream tributaries.
The helix design emerged after intense collaboration with Reclamation’s Hydraulics lab in Denver, with staff considering more than 15 computer-generated designs before deciding the helix would be most effective, while also minimizing turbidity during passage, which can hurt fish.
“We hope the helix will teach us a lot, so that we can take away some concepts as we work on the next reservoir projects,” Visser said.
The 6,155-square-mile Yakima River Basin is historically second only to the Snake River in supporting Columbia Basin salmon and steelhead runs.
But dam construction at four natural lakes — in the form of private timber crib dams in the early 1900s, which were replaced by Reclamation storage dams starting in 1910 — cut off multiple stocks of fish from fertile spawning ground.
For sockeye salmon, the dams equaled extinction in the area.
Agreements with WDFW and the Yakama Nation in 2002 and 2006 prescribed evaluation for possible fish passages at six sites, including a mandated passage at Cle Elum Reservoir, to improve aquatic conditions for existing stocks in the reservoir.
Cle Elum became Reclamation’s No. 1 priority because the site has the largest habitat — with 29 miles of streamflow and the most stocks of fish among the sites.
Reclamation decided on the current design, including both the juvenile passage and the adult passage structures on the opposite bank, as the preferred alternative in August 2011.
Funding for the project is split 50-50 between Reclamation and Ecology. Washington state provided $8.8 million for the final design of the fish passage facilities, which Reclamation completed in 2015.
Mark Johnston, a research scientist who has worked for the Yakama Nation Fisheries for more than 30 years, said studies currently underway will allow staff to enumerate the fish in the upper river and determine survival rates for adults.
Sockeye salmon have historically been important to tribal people who used to fish near the reservoir because sockeye came in the fall and preserved well for trading, bartering, food, and celebrations, Johnston said.
“Tribal villages used to fish here, but sockeye went extinct,” Johnston said. “So, ecologically, this project is huge.”