I have stated in previous posts that there is an individual - David Paulides (who formally worked in some capacity in law enforcement) - who has written a series of books called Missing-411. In these books, he recounts hundreds of unsolved missing persons cases of children (some Deorr's age) and adults who have gone missing in National Parks (and nearby wilderness areas) in the U.S., Canada, and in some other locations around the world
all under similar circumstances. After careful examination of these disappearances, he has concluded that people are disappearing from North America's National Parks and Forests at a rate that few people realize, and all under very similar circumstances. However, from what I have read and heard Paulides say in online or radio interviews, he does not believe those disappearances are the work of a serial killer/killers - and at this point he can only postulate as to what may be happening. However, in his books he tries to just give the facts about each disappearance and talk about the similarities and patterns without going too much into what he believes may be happening.
One of the reasons he discounts a serial killer(s) is the remoteness of the locations where these children (and adults) go missing as well as the randomness of the events.
As far as dates, lists and details of such disappearances - it has taken Paulides something like 6 years to compile the information as the National Park Service (at least in the US) maintains there is no central list of database of such disappearances - and there have been thousands - and that each park keeps its own list.
Paulides has created a map to show "cluster areas" of these disappearances based on the information he has gathered.
Click here for a link to one version of his cluster map.
Understand that Paulides is also involved in researching the Bigfoot phenomena. However, I have heard him speak in interviews on YouTube about how, although he believes there may be a Sasquatch connection, he feels he still does not understand what is really happening other than the fact that these disappearances are real.
Now - there is still the possibility Deorr did fall into the stream and drowned and his body was swept away in the rapidly moving water (at least it looked rapidly moving in one of the videos that was posted.) He may also have made his way to the reservoir and drowned. But, if neither of these scenarios occurred, then he unfortunately has joined the list of children who have disappeared "in the blink of an eye" in a National Park or Forest. I am praying that they find him.