The Grand River flows across Ottawa County for about 30 miles, entering the County in the Jenison area on the east side of the County and ending in the west at Lake Michigan in Grand Haven. It is a very significant waterway with many interesting natural features, and it is also rich in history. View an Interactive River Map. **Please Note: Some of the links on the Grand River Heritage Water Trail website require Microsoft's Silverlight plug-in to operate properly. Download Microsoft Silverlight