Ruisseau Grassy is a River located in Lac-des-Eaux-Mortes; La Mitis, Quebec.

• Latitude: 48° 20' 3'' North   (decimal: 48.3342108)
• Longitude: 67° 54' 39'' West   (decimal: -67.9108398)
• Topography Feature Category: River
• Geographical Feature: Ruisseau
• Canadian Province/Territory: Quebec
• Location: Lac-des-Eaux-Mortes; La Mitis
• Atlas of Canada Locator Map: Ruisseau Grassy
• GPS Coordinate Locator Map: Ruisseau Grassy Lat/Long