Lookout Mountain
Lookout Mountain rises to 2,036 m in California. Mount San Antonio stands 3,068 m to the north-northeast, 3.2 miles off. The nearest named place is Mt. Baldy Museum & Dorothy Wisely History Center, a museum 1.2 miles away. Arroyo Seco Historic Parkway - Route 110 passes 28 miles off. 59 named summits stand within 25 miles.
The story
Lookout Mountain in Los Angeles County, California, is a 6,812-foot (2,076 m) peak on the shoulder of Mount San Antonio ("Mount Baldy"). Albert A. Michelson used the peak to measure the speed of light in 1925–1929. For him to do so, the United States Coast and Geodetic Survey in 1923 established a 21.5-mile (34.6 km) baseline with an accuracy of 1 part in 11 million from Pasadena, California, at the base of Mount Baldy roughly to Rancho Cucamonga at the base of Mount Wilson. It may have been the most accurate baseline ever determined at the time. The Coast and Geodetic Survey then used the baseline to triangulate the distance to the Mount Wilson Observatory, with a distance error of about 1 part in 5 million, and Michelson measured light travel time between the stations with a rotating mirror apparatus. The concrete piers on Lookout Mountain used for the Michelson observations still exist. The first fire lookout in the Angeles National Forest was built on Lookout Mountain in 1914 and stood until it burned in 1927.
From Wikipedia, CC BY-SA 4.0.
Wikidata Q49046579, referenced by the OpenStreetMap record.
What the record says
- Elevation
- 2,036 m
How to reach it
- 27.9 mi off the Arroyo Seco Historic Parkway - Route 110, National
Named places within 25 miles
- Stanley-Miller Miner's cabin: 4.8 mi
- 1983 Winter Transit Memorial: 6.4 mi
- Schowalter Rock Pile: 8.3 mi
- In the Pines: 9.0 mi
- Vincent's Cabin: 9.2 mi
- San Antonio Park: 6.7 mi
- Padua Avenue Park: 7.3 mi
- Joe Elliot Tree Memorial: 7.3 mi
- Heritage Community Park: 7.6 mi
- McCarthy Park: 7.7 mi
- Hog Back: 2.0 mi
- Sunset Peak: 2.3 mi
- Sugarloaf Peak: 2.4 mi
- Spring Hill: 2.7 mi
- West Baldy: 2.9 mi
- William G. Kerckhoff 1856-1929: 6.7 mi
- Intersections II: 9.5 mi
- Pomegranate Trees: 9.8 mi
- Madonna of the Trail: 9.9 mi
- Scripps Graffiti Wall: 10.1 mi
- Sam and Alfreda Maloof Foundation for Arts and Crafts: 6.9 mi
- Western Junipers: 9.3 mi
- Conifer Country: 9.4 mi
- Nutall's Scrub Oaks: 9.4 mi
- Baja California: 9.4 mi
- Mt. Baldy Museum & Dorothy Wisely History Center: 1.2 mi
- Sam Maloof House: 6.9 mi
- Wrightwood History Museum: 8.0 mi
- Raymond M. Alf Museum of Paleontology: 9.4 mi
- Casa de Rancho Cucamonga County Museum: 10.2 mi
- Claremont Hills Wilderness Park: 7.4 mi
- Sycamore Canyon Park: 8.4 mi
- Robert J. Bernard Biological Field Station: 9.7 mi
- North Etiwanda Preserve: 9.8 mi
- Rodman Arboretum: 10.1 mi
- Forked Spruce Spring: 1.9 mi
- Fallen Leaf Spring: 2.5 mi
- Columbine Spring: 4.0 mi
- Guffy Spring: 6.6 mi
- Lamel Spring: 9.5 mi
- Shelter B: 7.6 mi
- Site A: 9.0 mi
- Arch Picnic Area: 9.2 mi
- Grassy Hollow Picnic Area: 9.2 mi
- Site B: 9.2 mi
- Bridge to Nowhere: 4.8 mi
- Tongva Village: 9.6 mi
- Fairplex Garden Railroad: 12.6 mi
- Route 66: 12.8 mi
- Devil's Punchbowl: 15.3 mi
- San Antonio Falls: 2.8 mi
- Canyon Falls: 4.6 mi
- Wolfskill Falls: 6.6 mi
- Etiwanda Falls: 9.7 mi
- Bonita Falls: 9.8 mi
- Llano Del Rio: 19.8 mi
- Politana: 24.1 mi
- La Placita: 24.4 mi
- Mt. Baldy Wayside Picnic Site: 1.7 mi
- Norco Bluffs: 21.9 mi
Other summits around it
The highest named summits within 25 miles of Lookout Mountain. Elevation from each summit’s own record; bearing measured between the two coordinates.
| Summit | Bearing | Elevation | Distance |
|---|---|---|---|
| Mount San Antonio | NNE 30° | 3,068 m | 3.2 mi |
| West Baldy | NNE 24° | 3,044 m | 2.9 mi |
| Pine Mountain | NNE 21° | 2,942 m | 4.8 mi |
| Dawson Peak | NNE 30° | 2,917 m | 4.4 mi |
| Mount Harwood | NE 42° | 2,907 m | 3.6 mi |
| Mount Baden-Powell | NW 326° | 2,860 m | 9.2 mi |
| Throop Peak | NW 315° | 2,779 m | 10.0 mi |
| Mount Burnham | NW 322° | 2,740 m | 9.8 mi |
When to go
Light through the year
| Date | Sunrise | Golden hour | Sunset |
|---|---|---|---|
| March equinox | 06:55 | 18:30 | 19:03 |
| June solstice | 05:40 | 19:29 | 20:07 |
| September equinox | 06:40 | 18:16 | 18:49 |
| December solstice | 06:54 | 16:07 | 16:46 |
Local time (America/Los_Angeles).
Climate normals
Months averaging 50–80 °F: May–Oct.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg °F | 37 | 36 | 42 | 46 | 54 | 61 | 68 | 67 | 61 | 51 | 42 | 36 |
| Precip in | 4.4 | 4.9 | 1.9 | 0.8 | 0.8 | 0.1 | 1.1 | 0.3 | 0.4 | 1.2 | 1.1 | 4.1 |
1991–2020 U.S. Climate Normals, NOAA NCEI — Wrightwood, 8 mi away.
Where this comes from
Location and category confirmed against OpenStreetMap.
OpenStreetMapWikidataOpenStreetMap element node/358801634
Day trips start here
Take the scenic way to Lookout Mountain.
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