| Sewickley Creek | |
| Name Other: | Tributary to Youghiogheny River |
| Image Alt: | Sewickley Creek from the Five Star Trail |
| Map Size: | 300 |
| Pushpin Map: | USA Pennsylvania#USA |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Location of Sewickley Creek mouth |
| Pushpin Map Alt: | Map of Sewickley Creek mouth location |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Pennsylvania |
| Subdivision Type3: | County |
| Subdivision Name3: | Westmoreland |
| Subdivision Type4: | Borough |
| Subdivision Name4: | Hunker Youngwood New Stanton |
| Length: | 29.53miles[1] |
| Discharge1 Location: | Youghiogheny River |
| Discharge1 Avg: | 205.64cuft/s at mouth with Youghiogheny River[2] |
| Source1: | Fourmile Run divide |
| Source1 Location: | about 1 mile north-northeast of Pleasant Unity, Pennsylvania[3] |
| Source1 Coordinates: | 40.2658°N -79.4353°W[4] |
| Source1 Elevation: | 1145feet |
| Mouth: | Youghiogheny River |
| Mouth Location: | Collinsburg, Pennsylvania[5] |
| Mouth Coordinates: | 40.2292°N -79.7775°W |
| Mouth Elevation: | 740feet |
| Progression: | Youghiogheny River → Monongahela River → Ohio River → Mississippi River → Gulf of Mexico |
| River System: | Monongahela River |
| Tributaries Left: | Welty Run Boyer Run Wilson Run Belson Run Buffalo Run Lick Run Hunters Run |
| Tributaries Right: | North Branch Sewickley Creek Brinker Run Township Line Run Jacks Run Pinkerton Run Kelly Run Little Sewickley Creek |
| Bridges: | Schmuckers Road, PA 981, Kemerer Road, Phillips Road, PA 130, Bingham Road, Dutch Hill Road, Pollins Road, Fairground Road, United Road, Mt. Pleasant Road, Brinkerton Ext., Udell Road, Mt. Pleasant Road, Trouttown Road, Stone Church Road, US 119, I-76, S Center Avenue, Chaney Brothers Road, New Stanton-Ruffsdale Road, Hunker Waltz Mill Road, Waltz Mill Road, I-70, Yukon Road, Creek Road, Bells Mills Road, PA 136, Apples Mill Road, Sutersville Road |
Sewickley Creek is a 29.53miles long 4th order tributary to the Youghiogheny River in Westmoreland County, Pennsylvania. This is the only stream of this name in the United States.[4]
According to the Geographic Names Information System, it has also been known historically as:[4]
Sewickley Creek rises in a pond about 1 mile north of Pleasant Unity, Pennsylvania,[3] and then flows westerly to join the Youghiogheny River across from Collinsburg.[5]
Sewickley Creek drains of area, receives about 43.3 in/year of precipitation, has a wetness index of 370.17, and is about 45% forested.[2]