A small ammonia leak from the Darigold plant at Issaquah spilled through a storm drain into the East Fork of Issaquah Creek and killed about four-dozen fish.

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A small ammonia leak from the Darigold plant at Issaquah spilled through a storm drain into the East Fork of Issaquah Creek and killed about four-dozen fish.

The Ecology Department says most of the fish were small sculpin with a few salmon and trout.

The spill was discovered Wednesday by a state biologist who was surveying spawning salmon in the stream.

The dairy plant stopped the refrigerant leak by mid-afternoon. The total amount of the spill is unknown.

The Ecology Department says Darigold is cooperating with the investigation into the cause of the spill.