RedactedNarrative: At approximately 1015 hours he was motoring towards the East Dock of the North Boat Ramps on Chatfield Reservoir, Chatfield State Park, Jefferson County, CO at approximately 2 miles per hour. There was no wind, but wake action in the area had produced choppy water conditions with waves approaching 1.5’ in height. OPERATOR 1 stated that waves began coming over the transom of his vessel filling the vessel. The vessel then capsized and sank beneath Him. OPERATOR 1 stated he was wearing a PFD and floated to the side as the vessel turned over and resurfaced upside down. OPERATOR 1 stated that an identified motorist picked up OPERATOR 1 and assisted him in righting the vessel, and towing it to the dock where they were able to get it onto OPERATOR 1 trailer. OPERATOR 1 stated that when it overturned, he lost the following items: a marine battery, an anchor, a handheld Garmin GPD, an ultralight rod and reel, and a tackle box containing, by OPERATOR 1 estimate, approximately $1,000.00 worth of tackle collected over 40-50 years.