The New Adventures of Lassie - Season 2 Episode 11 Inside The Dam
Overview: When Zoe and Harvey visit the new dam at the edge of the park, the noises emanating from the construction upset Lassie who refuses to go any closer. When she understands the valley can be flooded due to Nick's error, Lassie has to draw on her inner strength to overcome the stress the sounds of the dam are causing her and save the kids trapped inside the dam.