Clackamas Fish Hatchery

Clackamas Fish Hatchery

Background:

The Clackamas Hatchery is managed by the Oregon Department of Fish and Wildlife and located just off the Clackamas River in Estacada, OR. The facility provides adult collection, egg incubation and rearing of spring Chinook and winter steelhead, rearing of coho, and acclimation of summer steelhead. The facility recently upgraded its intake which involved the construction of a new gravity intake on Estacada Lake, a dammed portion of the Clackamas River, to increase the quantity and quality of water entering the hatchery.

The intake upgrade included installation of an ISI T54‐80EA-R screen unit in Estacada Lake to meet NOAA fish screen criteria for anadromous salmonids. The installed wedge wire T screen has two cylinders, each measuring 54 inches (1,372 mm) in diameter and 80 inches (2,032 mm) in length. With 1.75 mm slot size and 50 percent open area, the screen will satisfy the 48.5 cfs (31.3 MGD; 4,944 m3/h) diversion flow with 15% allowance based on an approach velocity of 0.31 fps (9.4 cm/s). The screen system includes a 56-foot (17 m) long, epoxy coated steel track with knife gate mounted on a 36-inch (914 mm) pipe and includes a water jetting system. The water jetting system utilizes a submersible high-pressure pump to move debris away from each cylinder on the T screen.

Benefit of ISI System

ISI's retrievable brush-cleaned cylindrical screen system provides the following key advantages at this site:

1. The brush cleaning and water jetting systems ensure that the screen surface will remain free of debris and fouling organisms and therefore maintain compliance with approach velocity requirements and reliably sources water to the facility;
2. The on-river design keeps fish in the river rather than subject them to any type of collection or conveyance system;
3. The retrievable screen with gate design allows the screens to be raised out of the river for inspection and maintenance while keeping the pipe opening sealed.

Owner:

Oregon Department of Fish and Wildlife

Engineer(s):

Oregon Department of Fish and Wildlife

General Contractor:

Natt McDougall Company

Location:

Clackamas River, Estacada, OR