There are already fish in the lake. Some native fish made it into the lake before the fill started. So since there are some Chub and Minnows in it, and they are a few years old now, it will throw a wrench in stocking it. The number of fish and ages of the fish is making biologists think the fish have reproduced in the lake. They probably were in the small impoundment ponds used as dust abatment water during the building of the dam.
Amazingly, best guess is the fish were pumped up and over the ridge from the Animas in a small irrigation pump and pump lines, like you would see in a farm field. The pump was used to supply enough water for dust when water shed wasn't enough.
The lake's outlet works is designed to kill most fish that pass through. The gates basically should turn the fish into sushi when they pass through. Testing is going on to prove how well they work. If they kill all the fish that pass through, fry will be the hardest to kill, then it opens the lake up to more stocking options. The biologists want to be sure non native species can't escape from the lake to the Animas.
So there is a lot going on behind the scenes in deciding what will be stocked in the lake.
The lake is pretty featureless. The only structure is deep in the lake where construction took fill dirt from. Sort of similar to the old quarry pits in Chatfield. I got a picture of the Lake before fill up, but it is not letting me attach it. Not sure how good of a fishery it will become.
On the dam looking east:
Looking north from south, top of dam. Flat, gray area in the middle of the picture is one of the proposed boat launch sites:
Flat, featureless. Water will come up almost to the trees: