[2] Bear Creek begins within Bear Valley and flows south for approximately 25 miles draining a watershed of 130 square miles in the lower elevations of the Inner Coastal Range entirely in Colusa County.

[3][4] Bear Creek provides a perennial habitat for fish to navigate throughout the year.

By far the most common fish found in Bear Creek is the native California roach.

The creek also provides habitat for a wide assortment of other creatures including amphibians such as the western pond turtle[5] and other water-based organisms.

Due to its perennial nature, Bear Creek also provides a reliable water supply to other creatures, thereby attracting large mammals such as deer and the Native California tule elk.