Harper Lake (aka Leon Wurl Wildlife Santuary) is located on the east side of McCaslin Blvd. about 1/4 mile south of S. Boulder Road in Louisville, Colorado (GPS coordinates: 39.978287-105.164490). Although there is an entrance at the northeast corner of the lake via Alder Street, members typically use the southwest entrance just off of Washington Street (marked by the red pin in the map below). There is a parking lot and restroom facility here as well.