This is from the Denver Water website:
The High Line Canal, designated as a National Landmark Trail, was completed in 1883 to deliver irrigation water. Today, the canal is owned and operated by Denver Water. The canal trail has become a major recreational amenity in the Denver area, as people enjoy using the canal’s trail for hiking, biking, jogging and horseback riding.

"The Arizona Trail is an 800+ mile recreation trail from Mexico to Utah that connects mountain ranges, canyons, deserts, forests, wilderness areas, historic sites, trail systems, points of interest, communities, and people.

If I can just get off of this LA freeway
Without getting killed or caught
I'd be down that road in a cloud of smoke
For some land that I ain't bought bought bought
- Guy Clark (L.A. Freeway)

“In the late 1950s Carl Pfiffner spoke passionately about traversing from the Arapaho Peaks to Longs Peak along the Continental Divide. This project retains all of its original mystique and it the ultimate mountaineering adventure in the Front Range. The adventure can be extended by going from Berthoud Pass to Milner Pass. There are many variations to this complicated project and any attempt requires your creativity.” - Gerry Roach, “Colorado’s Indian Peaks Wilderness Area, Classic Hikes & Climbs” (1989)