 The Adams River run occurs every year , but every fourth year ( called a " dominant " year ) , the numbers are much higher . 2014 was the most recent dominant run . According to Canada 's Department of Fisheries and <unk> , the Fraser River sockeye run of 2010 was the largest since 1913 , numbering an estimated 34 million fish . At least 3 @,@ <unk> @,@ 000 of these fish returned to the Adams River to spawn . There is no clear consensus as to why the Adams stock has rebounded so remarkably ( 1991 saw an estimated return of <unk> fish ) . In the Globe and Mail , Simon Fraser University biologist John Reynolds said “ [ predicting salmon numbers ] is massively complex , even for a scientist . ” 
