| North Branch Grass River | |
| River | |
| Tributaries | |
| - left | Gulf Brook |
| - right | La Rock Creek |
| Source | Church Pond |
|---|---|
| Mouth | Grass River |
| - location | Russell, New York |
| - elevation | 620 ft (189 m) |
| - coordinates | 44°25′28″N 75°06′27″W / 44.42444°N 75.10750°WCoordinates: 44°25′28″N 75°06′27″W / 44.42444°N 75.10750°W |
| Basin | 60.2 sq mi (156 km2) |
The North Branch Grass River flows into the Grass River near Russell, New York.