Grand Chasm Falls is a waterfall in Los Angeles County, California, in the Southern California Mountains region, with a total height of about 48 feet. It lies about 1.5 miles northeast of Altadena and roughly 4.4 miles north of Pasadena as the crow flies.
At 48 feet it is on the modest side for California, where the typical waterfall with a recorded height stands around 70 feet; it ranks 186th of 286.
The Southern California Mountains are rugged, chaparral-covered ranges with pine and fir at higher elevations, rising abruptly from the coastal basins. Canyons cut into their steep slopes carry seasonal streams with waterfalls that are best after winter rains.
There are 48 recorded waterfalls in Los Angeles County. Ribbon Rock Falls, is under a mile away. Lodged Boulder Falls, 12 feet high, is under a mile away. Maidenhair Falls, is under a mile away.
Grand Chasm Falls is located at 34.2072° N, 118.1167° W. The listing is based on the World Waterfall Database, one of the sources compiled by the U.S. Geological Survey in its inventory of waterfalls and rapids of the conterminous United States. The exact position has not yet been verified on aerial imagery, so treat the map pin as approximate. Details on trails, parking and access have not been documented for this waterfall yet.