Because Marysville is located at the confluence of the Yuba and Feather rivers, and the area is subject to heavy rains, Bok Eye was recruited to help avert floods.
由於瑪利斯委市位於猶巴河和羽毛河的會流處，常有洪水為患，而當時華人咸信北帝的神力可控制洪水；又會在適當時機降雨解旱，協助灌溉，因此乃修北溪廟並從中國大陸迎北帝來供奉。據瑪利斯委統計，該地區年平均雨量約有三千公釐，過多的雨量易釀災禍。