Big Creek originates in Boone County, Iowa, rising in Township 83 North, Range 25 West, and flows southward for approximately 21 miles before entering the Des Moines River in Polk County at Township 80 North, Range 25 West. This tributary system drains a significant portion of central Iowa's agricultural landscape, cutting through gently rolling terrain characteristic of the Des Moines Lobe landform region. The creek's watershed encompasses prime farmland with productive soils, though the stream corridor itself maintains ribbons of woodland and riparian vegetation along its banks. The waterway passes through predominantly rural countryside before reaching more developed areas as it approaches its confluence with the Des Moines River.

Big Creek Lake, a 866-acre impoundment created by damming the creek in Polk County, serves as the centerpiece of Big Creek State Park and represents the most significant recreational feature along the watercourse. Access to Big Creek is primarily available through Big Creek State Park, which provides multiple boat ramps and shore access points around the reservoir. The park offers 26 miles of multi-purpose trails suitable for hiking, bicycling, and cross-country skiing, along with camping facilities, picnic shelters, and a shooting range. The nearest significant population center is the Des Moines metropolitan area, making this a heavily utilized recreational resource for central Iowa residents.

The creek's flow regime reflects typical Midwestern patterns, with peak flows occurring during spring snowmelt and following significant rainfall events. Summer months typically see reduced water levels, while autumn generally provides stable conditions. The watershed's agricultural character means that water quality can be influenced by seasonal runoff patterns.

Wildlife inhabiting the Big Creek corridor includes white-tailed deer, wild turkey, and various waterfowl species that utilize the reservoir and wetland margins. The lake supports populations of largemouth bass, bluegill, crappie, channel catfish, and other warmwater fish species common to central Iowa impoundments.

Historically, Big Creek served as a drainage feature through agricultural lands before the creation of the state park and reservoir in the mid-20th century. The impoundment project transformed the creek from a modest agricultural stream into a significant recreational destination, reflecting Iowa's broader efforts to provide outdoor recreation opportunities for its growing urban population.

Paddlers should be aware that conditions on Big Creek Lake can change rapidly with wind, as the relatively open water provides little shelter. The Iowa Department of Natural Resources manages the park and enforces standard state boating regulations, including requirements for personal flotation devices and boat registration.