Lecture: Flash Floods in Semi-Arid Landscapes – FULL (waitlist)
ABDNHA Library 652 Palm Canyon Drive, Borrego Springs
$8 – $12
7 events found.
Please review our hiker info page to familiarize yourself with hiker safety rules and our hike ratings so that you can select hikes that meet your level of fitness. Unless specified otherwise in the activity descriptions below, hikes have a 15 person limit, and they begin in the ABDNHA parking lot.
Week of Events
Sunday, January 18, 2026
No events on this day.
Monday, January 19, 2026
No events on this day.
Tuesday, January 20, 2026
No events on this day.
Wednesday, January 21, 2026
No events on this day.
Thursday, January 22, 2026
No events on this day.
Friday, January 23, 2026
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January 23, 2026 -Lecture: Flash Floods in Semi-Arid Landscapes – FULL (waitlist)
Lecture: Flash Floods in Semi-Arid Landscapes – FULL (waitlist)
Special Earth Sciences Weekend!
Speaker: Suzanne Walther, Ph.D., University of San Diego
PROGRAM IS FULL - PLEASE CALL ABDNHA at 760-767-3098 to get on waitlist.
It has been said that the two most common ways to die in the desert are from thirst and from drowning. Flash floods are the leading weather-related cause of death in the U.S. and many parts of the world, and cause billions of dollars in damage. Dr. Suzanne Walther is a fluvial geomorphologist. She studies rivers, streams, floods, sediment movement, and how the natural flow of water shapes the landscape, interacts with ecosystems, and significantly impacts human development. The focus tonight is on flash floods in semi-arid areas, such as Borrego Springs, where they can occur, the conditions that lead to their formation, the powerful forces they unleash, their effects on water supply and drought, and what can be done to mitigate their destructive impact on human development. In the ABDNHA Library. General Public: $12, Members: $10, Volunteers: $8. You can register online at abdnha.org or at the Nature Center, 760-767-3098.
$8 – $12
Saturday, January 24, 2026
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January 24, 2026 -Field Trip: Ancient Lake Cahuilla – FULL (waitlist)
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January 24, 2026 -Lecture: Geology of San Diego County’s Peninsular Ranges
Field Trip: Ancient Lake Cahuilla – FULL (waitlist)
Special Earth Science Series
FIELD TRIP IS FULL - PLEASE CALL ABDNHA at 760-767-3098 to get on waitlist.
Leader: John Peterson, Hydrologist and Geologist
Approximately 12,000 years ago, the Colorado River altered its course, forming a massive prehistoric lake known as Lake Cahuilla, which is now the Salton Sea. The lake served as a vital resource for the Cahuilla, Kumeyaay, and Cocopah peoples. Over the centuries, the lake filled and dried up many times. It last filled between 1731 and 1733. Hydrologist John Peterson will lead a half-day field trip to the Salton Sea, where participants can explore the ancient lake's remnants, including visible "bathtub rings" and fishing traps. Meet at ABDNHA. General Public: $18, Members: $12, Volunteers: $10. Register online or at the Nature Center, 760-767-3098.
$10 – $18
Lecture: Geology of San Diego County’s Peninsular Ranges
Special Earth Science Series
Speaker: Geologist Don Barrie
Please join Mesa College geology professor and ABDNHA board member, Don Barrie, for this lecture on San Diego County’s Peninsular Ranges, with emphasis on the Laguna Mountains west of Borrego Springs. Don’s lecture will focus on how plate tectonic processes have created the complex collage of igneous and metamorphic rocks exposed both regionally, throughout southeastern California, and locally, in the Lagunas. In the ABDNHA Library. General Public: $12, Members: $10, Volunteers: $8. A related field trip is scheduled for Sun., Jan. 25.
$8 – $12