Bing found the following results
Big Blue River (Kansas) - Wikipedia
Blue River (Missouri River tributary) - Wikipedia
Big Blue River of Nebraska & Kansas – Legends of America
The Kansas River At The Big Blue River Confluence - ArcGIS …
Big Blue River (Indiana) - Wikipedia
Big Blue River (Kansas) - Wikiwand
Blue River in Kansas City | The Nature Conservancy
Big Blue River (Kansas) - Simple English Wikipedia, the free …
Historic Trails Park (Marshall's Ferry) - U.S. National Park Service
Big Blue River | Natural Atlas