"This is likely the most popular hike in the Grand Lake vicinity.

East Inlet is at the West Portal, confusing to those uninitiated to water demands in Colorado. The inlet is where a creek enters the east side of Grand Lake; the West Portal of Adams Tunnel reverses the flow to east of the Continental Divide. You will not encounter this confusion again, so just ignore it. Adams Falls is an easy stroll along the initial stretch of the East Inlet Trail.

Lucky coincidence oriented the falls so that the spray of falling water often refracts rainbows in sunny weather. To see a rainbow, orient yourself to view the falls with the sun at your back."

--Kent Dannen, Best Hikes Rocky Mountain National Park (Falcon Guides).