One time on first rain on really low water we had a one foot river jump in the day and as the employee did his evening rounds noticed fish moving but nothing not normal. Before he went to bed he did another evening check and headed right back to the office phone. It was now 11 in the evening and I shot up to see what was going on. From 5 to 11 PM we had nearly 2500 coho pour in. So we blocked the trap but damn near rolled the pond. As we used ground water that does not go up like the river so we had low summer flows with damn near the return all at once. The Coho return never did it like that again but it was educational.