The Beaver River is a tributary of the Ohio River in Western Pennsylvania in the United States with a length of approximately 21 mi (34 km). It flows through a historically important coal-producing region north of Pittsburgh. The Beaver River is formed in Lawrence County by the confluence of the Mahoning and Shenango rivers in the Mahoningtown neighborhood of New Castle. It flows generally south, past West Pittsburg and Homewood. It receives Connoquenessing Creek west of Ellwood City and flows past Beaver Falls and New Brighton. It joins the Ohio at Bridgewater and Rochester at the downstream end of a sharp bend in the Ohio approximately 20 mi (32 km) northwest of Pittsburgh. In the lower reaches near the Ohio River, the Beaver cuts through a gorge of underlying sandstone. The river is roughly parallel to the border with the state of Ohio, with both Interstate 376 and Pennsylvania Route 18 running parallel to the river itself.
Slippery Rock Creek is a small stream in Western Pennsylvania, a tributary of Connoquenessing Creek. From its source in Hilliards in Butler County, it flows through McConnells Mill State Park before flowing into the Connoquenessing in Ellwood City. Then, the Connoquenessing flows into the Beaver River just three miles south from the mouth of Slippery Rock.
Muddy Creek is a tributary of Slippery Rock Creek in Butler and Lawrence Counties in Pennsylvania in the United States. The run is 23.2 miles (37.3 km) long, flows generally west, and its watershed is 58.2 square miles (150.7 km2) in area. Muddy Creek is the main water source for Lake Arthur in Moraine State Park.
Tenmile Creek is a stream in Washington and Greene Counties, Pennsylvania, USA. It is a tributary of the Monongahela River.
Hell Run is an 4.5 mi (7.2 km) long tributary to Slippery Rock Creek in Lawrence County, Pennsylvania. Hell Run flows most of its distance through McConnells Mill State Park and is the only stream in Lawrence County, Pennsylvania rated as an Exceptional Value (EV) stream.
Cheeseman Run is a small tributary of Slippery Rock Creek in western Pennsylvania. The stream rises in western Butler County near Portersville and flows northwest into Lawrence County entering Slippery Rock Creek in McConnells Mill State Park.
Grindstone Run is a small tributary of Slippery Rock Creek in western Pennsylvania. The stream rises in eastern Lawrence County flows northwest into Slippery Rock Creek in McConnells Mill State Park.
Skunk Run is a small tributary of Slippery Rock Creek in western Pennsylvania. The stream rises in eastern Lawrence County at the Shenango and Slippery Rock Township line and then flows southeast entering Slippery Rock Creek in McConnells Mill State Park. The watershed is nearly 50% forested.
Taylor Run is a small tributary of Slippery Rock Creek in western Pennsylvania. The stream rises in southern Mercer County near Drake and flows south into Lawrence County entering Slippery Rock Creek upstream of Harlansburg, Pennsylvania. The watershed is roughly 60% agricultural, 30% forested and the rest is other uses.
Jamison Run is a small tributary of Slippery Rock Creek in western Pennsylvania. The stream rises in northern Lawrence County and flows south entering Slippery Rock Creek at Elliotts Mills, Pennsylvania. The watershed is roughly 46% agricultural, 45% forested and the rest is other uses.
Black Run is a small tributary of Slippery Rock Creek in western Pennsylvania. The stream rises in northwestern Butler County and flows northwest entering Slippery Rock Creek south of Elliotts Mills, Pennsylvania. The watershed is roughly 48% agricultural, 45% forested and the rest is other uses.
Hogue Run is a small tributary of Slippery Rock Creek in western Pennsylvania. The stream rises in northwestern Butler County and flows northeast then north entering Slippery Rock Creek at Camp Crestview. The watershed is roughly 34% agricultural, 61% forested and the rest is other uses.
Long Run is a small tributary of Slippery Rock Creek in western Pennsylvania. The stream rises in northwestern Butler County and flows south entering Slippery Rock Creek at Camp Bucoco, Pennsylvania. The watershed is roughly 49% agricultural, 44% forested and the rest is other uses.
McMurray Run is a small tributary of Slippery Rock Creek in western Pennsylvania. The stream rises in northwestern Butler County and flows south entering Slippery Rock Creek at Rock Hill Camp. The watershed is roughly 39% agricultural, 53% forested and the rest is other uses.
Brush Creek is a tributary of Connoquenessing Creek in western Pennsylvania. The stream rises in northwestern Allegheny County and flows 21.08 miles (33.92 km) northwest, entering Connoquenessing Creek at Hazen. The watershed is roughly 35% agricultural, 42% forested and the rest is other uses.
Scholars Run is a tributary of Connoquenessing Creek in western Pennsylvania. The stream rises in southwestern Butler County and flows south entering Connoquenessing Creek at Harmony, Pennsylvania. The watershed is roughly 36% agricultural, 53% forested and the rest is other uses.
Hottenbaugh Run is a tributary of Neshannock Creek in western Pennsylvania. The stream rises in east-central Lawrence County and flows south then west entering Neshannock Creek at Painter Hill. The watershed is roughly 53% agricultural, 40% forested and the rest is other uses.
Potter Run is a tributary to Neshannock Creek in western Pennsylvania. The stream rises in south-central Lawrence County and flows west and enters Neshannock Creek just downstream of Volant, Pennsylvania. The watershed is roughly 50% agricultural, 44% forested and the rest is other uses.
Hunters Run is a tributary to Neshannock Creek in western Pennsylvania. The stream rises in northeastern Lawrence County and flows northwest entering Neshannock Creek near Springfield Falls, Pennsylvania. The watershed is roughly 32% agricultural, 60% forested and the rest is other uses. This watershed drains the northern portion of State Game Lands #284 and is the location for Springfield Falls, a prominent waterfall on the run.
Indian Camp Run is a 2.70 mi (4.35 km) long 1st order tributary to Brokenstraw Creek. It is classed as a cold water fishery by the Pennsylvania Fish and Boat Commission.
