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| Slide Mountain: Slide Rock is the scene of a massive rockslide on the north face of a volcano. Within the last several hundred thousand years, gigantic landslides have occurred along Winter Ridge, which bounds Summer Lake basin on the west. These landslides are typically a mile in width and more than a thousand feet thick. The landslides failed catastrophically, very rapidly running out more than a mile onto the basin floor. Recent engineering study has found that large earthquakes triggered these gigantic landslides. The source of the earthquakes is the active Slide Mountain-Winter Ridge fault that runs along the base of Winter Ridge. The fault is capable of producing magnitude 7 earthquakes. The last documented ground-rupturing earthquake on the fault occurred between 2,000 and 10,000 years ago. |
| Winter Ridge: Is the rimrock west of Summer Lake. It was discovered and named on December 16, 1843, by Captain John C. Fremont of the U.S. Topographical Engineers. Fremont applied this name because of the bad weather he encountered at the summit of the ridge, where he looked down to the sunshine on the green grass around Summer Lake. He named the lake at the same time. |
| Ana Reservoir: Provides year round stocked rainbow trout fishing as springs beneath the reservoir keep water ice free even during the winter months. Hybrid bass growing in excess of 20 pounds can also be landed here. Ana Reservoir has an RV Park, tent campground and a river, Ana River, which exits from the reservoir. |
Services Provided at Summer Lake Rest Stop:
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