many streams have had flow problems. The flow can decrease over wintering and also prevent flushing of stream gravels. Floods in the Spring can wash out redds. Traffic on the redds from Cows and people can be a big problem on redds as well as harassment during spawning by anglers. Biomass of the insect life could be a determining factor on growth. Poaching may also be a problem. You don't need a rod to catch a brown during spawning. Poaching of large spawning bull trout in the Castle system has always been an issue.
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