Grass Mountain Lookout
| Registry Numbers | US 1782, CA 28 (view other lookout sites in United States, California) | 
| Date Registered | November 3, 2019 | 
| Nominated by | Brad Eells | 
| Location | 
Angeles National Forest Los Angeles County, California  | 
            
| Coordinates | 
                            N 34° 38.461' W 118° 24.791' (view using Google Maps) N 34° 38' 28" W 118° 24' 47" N 34.641012° W 118.413179°  | 
            
| Elevation | 4,611 ft (1,405 m) | 
| Built | 1934 | 
| Removed | 1951 | 
| Administered by | US Forest Service - Angeles National Forest | 
| Cooperators | Los Angeles County Fire Department | 
The Grass Mountain lookout was a cooperative lookout between the U.S. Forest Service and the Los Angeles County Forestry Department built in 1934. The structure was a California Region revision of the L-4 cabin on a 10 foot open timber tower.
The lookout was destroyed a wildfire in August 1951 and was not rebuilt.
                                1941 Los Angeles Times feature
                                Grass Mountain road construction - 1933
                                Grass Mountain Lookout Destroyed - Munz Lake Fire, August 27, 1951 - "Angelus" National Forest near Lake Hughes
                                Photo courtesy of USC Digital Library; Photographer: Lapp. Date: 08-27-51