The seaway, along with the Saint Lawrence River it passes through, also provides opportunities for outdoor recreation, such as boating, camping, fishing, and scuba diving. Invasive species and artificial water level controls imposed by the seaway have had a negative impact on recreational fishing. Of note, the Old Power House near Lock 23 (near Morrisburg, Ontario) became an attractive site for scuba divers. The submerged stone building has become covered with barnacles and is home to an abundance of underwater life.