Duck Creek begins in the rural areas north of Blue Grass and it empties into the Mississippi River between Bettendorf and Riverdale. At 19 miles (31 km) long it is the largest creek in the Quad Cities and is mainly used for storm water runoff. Duck Creek's watershed covers a total of 40,294 acres (16,306 ha). Of the total, 24,718 acres (10,003 ha), or 61%, are in Davenport; 12,231 acres (4,950 ha), or 31%, are in unincorporated Scott County and 3,345 acres (1,354 ha), or 8%, are in Bettendorf. The creek's water has elevated levels of E. coli bacteria, nitrates and chloride. Duck Creek has many tributaries, among them are: Silver Creek, Goose Creek, Pheasant Creek, Stafford Creek, Candlelight Creek, Robin Creek, Cardinal Creek and several unnamed streams.Duck Creek Parkway has 13.5 miles (22 km) miles of bike trail that follows the creek through Davenport and Bettendorf. It starts at Veterans' Memorial Park in Bettendorf and ends at Emeis Park and Golf Course in Davenport. Duck Creek also has a self-titled park and golf course on Davenport's border with Bettendorf called Duck Creek Park and Golf Course. Other parks along the creek and bike path include: Middle, Eastern, Garfield, Junge, Marquette, and Northwest. The Duck Creek watershed flows through 35,511 acres (14,371 ha) of private land and 4,783 acres (1,936 ha) of public land.