HorseTooth Reservoir
http://starmon.com/ht_res.html
Here's the area from the SE looking NW.                     

An OLD image of them removing dirt to contruct Horsetooth.

Here's an image after the leaks were repaired.

                                     This body of water is just west of Ft. Collins, as you can see on the bottom of the image.

Some of the things you can do at Horsetooth. And there is a Very nice view.
                                                                                                                                                                                                                            Starmon