| Marilla Brook | |
| Name Other: | Tributary to West Branch Tunungwant Creek |
| Pushpin Map: | Pennsylvania#USA |
| Pushpin Map Caption: | Location of Marilla Brook mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Pennsylvania |
| Subdivision Type3: | County |
| Subdivision Name3: | McKean |
| Length: | 5.66miles[1] |
| Discharge1 Location: | West Branch Tunungwant Creek |
| Discharge1 Avg: | 30.45cuft/s at mouth with West Branch Tunungwant Creek[2] |
| Source1: | Linn Brook divide |
| Source1 Location: | about 6 miles southwest of Bradford, Pennsylvania |
| Source1 Coordinates: | 41.924°N -78.7786°W[3] |
| Source1 Elevation: | 2120feet |
| Mouth: | West Branch Tunungwant Creek |
| Mouth Location: | about 1 mile southwest of Bradford, Pennsylvania |
| Mouth Coordinates: | 41.9415°N -78.6736°W |
| Mouth Elevation: | 1430feet |
| Progression: | West Branch Tunungwant Creek → Tunungwant Creek → Allegheny River → Ohio River → Mississippi River → Gulf of Mexico |
| River System: | Allegheny River |
| Tributaries Left: | Gilbert Run |
| Tributaries Right: | unnamed tributaries |
| Waterbodies: | Bradford City Number 3 Reservoir |
| Bridges: | West Washington Street, Sleepy Hollow Road, Culbertson Lane, Forest Hill Drive, Vernon Lane, Langmaid Lane |
Marilla Brook is a 5.66miles long third-order tributary to West Branch Tunungwant Creek.[1] This is the only stream of this name in the United States.[3]
According to the Geographic Names Information System, it has also been known historically as:[3]
Marilla Brook rises about southwest of Bradford, Pennsylvania, and then flows generally east to meet West Branch Tunungwant Creek about 1-mile southwest of Bradford, Pennsylvania.
Marilla Brook drains of area, receives about of precipitation, and is about 86.80% forested.[2]