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Spawning Ground Surveys
Three pass surveys conducted between mid-March through the end of May
32 Miles in the Ahtanum watershed
78 Miles in the Toppenish watershed
93 Miles in the Satus watershed.
Notes:
Usually one pass in March, one in April, and one in May
Most suitable spawning habitat is surveyed– with a few exceptions (areas where access is difficult in the spring with snow pack or un-travelable roads)