Sheetiron Mountain Lookout - 1915
| Registry Numbers | US 1904, CA 99 (view other lookout sites in United States, California) | 
| Date Registered | February 1, 2020 | 
| Nominated by | Brad Eells | 
| Location | 
Mendocino National Forest Lake County, California  | 
            
| Coordinates | 
                            N 39° 29.476' W 122° 44.045' (view using Google Maps) N 39° 29' 29" W 122° 44' 03" N 39.491259° W 122.734081°  | 
            
| Elevation | 6,502 ft (1,982 m) | 
| Built | Circa 1915 | 
| Removed | Unknown | 
| Administered by | US Forest Service - Mendocino National Forest | 
Sheetiron Mountain was a 7x7 Observation only cabin on a 70 foot X-Brace open steel tower. A residence cabin was also built.
A BC-201 Fireman-Lookout cabin was added in 1935.
Only the foundation of the original cabin remains today.