Overflow and open holes at mouth of Pike's Slough No flash player has been set up. Please select a player to play Flash videos. Video not playing? Update your browser or download the video clip Espen Jervsjo talks about overflow and open holes at the mouth of Pike's Slough and out on the main channel of the Tanana River. Process Observed: Open WaterOverflow Date Process Observed: Tuesday, March 1, 2011 Galleries: Mouth of Pike's Slough Gallery