Operator of V1 was heading west on Lake Greeson across from Kirby Landing in the rain and fog.  Operator stated he lost visibility and his direction; he struck something and this caused V1 to turn to the left and then it ran up on the bank.  He stated he struck his shoulder on the windshield which caused bruising.  The passenger stated he struck his head on something which caused a small cut and minor bleeding.
KIRBY                         