Introduction to
Field Guide to the San Gabriel Mountains
Hikes in the San Gabriel Mountains

The San Gabriel Mountains (SGM) are the mountain range forming a major part of the northern border of the Los Angeles Basin. They are one of the highest and most rugged portions of the Transverse Ranges of Southern California. The mountains have been elevated significantly within the last 10 million years, and the uplift continues today along the faults that border the mountains.

The SGM are laced with trails and roads, and are among the most visited places in the United States. The Mountains included the entire Angeles National Forest and the portion of the San Bernardino National Forest west of Cajon Pass. The Angeles National Forest has over 30 million visitors per year, more than any other National Forest.

This url ( contains two major related sites: Field Guide to the San Gabriel Mountains and Hikes in the San Gabriel Mountains.

Field Guide to the San Gabriel Mountains Website

This is a field guide to many aspects of the SGM, coauthored by Jane Strong and myself. As of 12/29/99, we have written ~100 webpages that include, among other pages:

In addition, this site collects and organizes all web information about the SGM written by others, with ~150 such webpages indexed on 12/29/99.

See also a more complete introduction for this site.

Hikes in the San Gabriel Mountains Website

This is a hiking guide to the SGM, authored by myself. As of 12/29/99, the site includes:

All information on the web related to a given hike (conditions, web links, view plots, places, etc.) is collected on a page devoted to a given hike.

See also a more complete introduction for this site.

Both Websites

Both sites are far from complete, but the two sites each are already significantly larger than a typical guidebook and continue to grow. For comparison, Robinson's and Schad's guidebooks each contain ~0.5 MB of text, and these two sites together contain over 2.0 MB of text just in the pages hosted here. At least another 2.0 MB, and probably much more, is contained in the external pages that are indexed here.

Both sites share the following files. All are found in the About This Site area of the main page for each site, except for the search page which is found at the top of the main pages:

Both sites have no connection with any company or organization, and result from the personal work of the authors, as well as the volunteer input from many readers credited either on the page with their input or on the acknowledgements page for each site. The referenced links are also mostly the result of volunteer effort by many different webauthors, although a few referenced pages come from commercial efforts. No endorsement of any kind is implied by the existence of a link from these pages, other than our belief that there is some useful information contained within those links.

It is a misconception held by some people that webauthors somehow get a fee for every reader who accesses a webpage. This is true only for some commercial sites supported by advertising. In fact, in most cases, webauthors pay money to put their pages online and make it available to the public. Fortunately, the amount of money for a site like this is small, $275 per year for this site. In comparison, since the page charges for many major scientific journals are ~$100 per printed page, this site would cost ~$20,000, making the dollar costs of a website essentially negligible!

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Copyright © 1996-2000 by Tom Chester
Permission is freely granted to reproduce any or all of this page as long as credit is given to me at this source:
Comments and feedback: Tom Chester
Last update: 14 November 2000