nikki ~ So you're saying that the trail around the lake is fenced on both sides, with the exception of the area that I have outlined in red on my map? It appears to be about 23 feet or so based on my rough outline, so that would correspond with your thought of it being about 30 feet.
If that is where they drain and fill the lake, then is there a separate road that leads to that area or do they use the nature trail to drive to the area? It appears that there is an access road south toward the trail and lake at the area where South Evans Road and Arbutus Avenue meet. (Map is in my siggy)
If they were abducted, they could possibly have been pulled into the wooded area and to that access road to a waiting car and been taken from the area fairly quickly, IMO.