This map is not intended to be used to determine property ownership nor public fishing access. Consult official maps and appropriate resources for detailed access information.
The river path on the map above shows Beaver Creek. The Google map labels where Red Gulch is north of the Timber Creek confluence.
From Steve Schweitzer's A Fly Fishing Guide To Rocky Mountain National Park, flyfishingrmnp.com:
Beaver Creek
Like Red Gulch, you can't help but find Beaver Creek as you fish the Colorado upstream. It has populations ...
Park at the Timber Creek Campground and work the Colorado upstream till you find these tributaries. Or access Beaver Creek from the Timber Lake Trailhead on US-34 north of Grand Lake.