Chicago River

The Chicago River is 156 miles (251 km) long, and flows through Chicago, including the downtown. Originally, the river flowed into Lake Michigan. As Chicago grew this allowed sewage and other pollution into the clean-water source for the city. This contributed to several public health issues including some problems with typhoid. The Chicago River has been highly affected by the industrial and residential areas around with attendant changes to the quality of the water and riverbanks. Several species of warm water fish are known to inhabit the river including largemouth and smallmouth bass, rock bass, crappie, bluegill, catfish and carp. The river also has a large population of crayfish.


Clear Creek

Clear Creek is a tributary of the South Platte River, approximately 40 mi (64 km) long, in north central Colorado in the United States. The creek provided the route of the Colorado Central Railroad, and later for the United States Highway 6 and Interstate 70 as they ascend to the Continental Divide west of Denver. It is largely a somewhat ignored urban stream, with an undeveloped floodplain.


Sava River

The Sava (Bosnian, Croatian, Slovene: Sava; Serbian: Сава, Sava) is a river in Europe, a right side tributary of Danube at Belgrade. It is 945 km long and drains 95,719 km² of surface area. It flows through four countries: Slovenia, Croatia, Bosnia and Herzegovina (making its northern border) and Serbia. The river has high electricity production potential in its upper course, up to 3.2 (including tributaries 4.7) billion kWh, which has not been used until lately.


Ohio River

The Ohio River is the largest tributary by volume of the Mississippi River. It is approximately 981 miles (1,579 km) long and is located in the eastern United States. The river had great significance in the history of the Native Americans. It was a primary transportation route during the westward expansion of the early U.S. The Ohio River is young from a geologic standpoint. The river formed on a piecemeal basis beginning between 2.5 and 3 million years ago. The earliest Ice Ages occurred at this time and dammed portions of north flowing rivers. The Teays River was the largest of these rivers, and the modern Ohio River flows within segments of the ancient Teays. The ancient rivers were rearranged or consumed by glaciers and lakes.