In normal to wet rain seasons vernal pools can be found throughout the Simi Hills. The pool pictured above is near the sheep corral at China Flat, and another small pond was found nearby, along Albertson Motorway fire road. I’ve also found vernal pools in the Rocky Peak area and near Sage Ranch.
Geologically, the Simi Hills are characterized by the sandstone rocks of the Chatsworth formation. These inclined layers are of varying hardness, and erode at different rates. It’s my guess that water collects in sandy soils between, or at the base of, the more resistant layers.
Lasky Mesa from a ridge near Bell Canyon. Low clouds from a rapidly advancing marine layer are moving into the San Fernando Valley. Saddle Peak can be seen in the distance, on the right.
Southern California can have inclement Winter weather. This January downtown Los Angeles experienced a streak with 8 days of measurable rain, and last year temperatures in the suburbs plunged to a frigid 20°F. Maybe this doesn’t compare to Seattle’s 2005-2006 rain streak of 27 days, or International Falls’ recent record low of 40° below zero, but it qualifies as rainy and cold none the less.
Today it was not rainy and cold. It was just about as pleasant as a day could be. Skies were blue, winds were light, and the temperature was in the mid-seventies. Starting at the Wendy Dr. trailhead on Potrero Rd., we enjoyed the perfect weather by doing a 14.5 mile variant of the Boney Mountain Half Marathon Course.
The photograph above is of the Hidden Pond Trail near Hidden Pond — recently restored by Winter rains.
It’s about time — all the rain in Southern California is finally turning our hills green! Last year the hills of East Las Virgenes Canyon were sun bleached and rain starved.
According to preliminary NWS data, Downtown Los Angeles (USC) recorded measurable rain on each day from January 21 to January 28, 2008. Based on this NWS ranking for 1921-2006, this puts this eight day period in the top six of the station’s wettest streaks from 1921-2007.
So far this water year Downtown Los Angeles has recorded 11.73 inches of rain, which is 4.77 inches above normal. Last year on this date Los Angeles had recorded only 1.5 inches of rain. Even if Los Angeles were to receive no rain through the entire month of February (not likely), we would still go into the month of March ahead of normal.
The photograph is from a muddy run at Ahmanson Ranch — now Upper Las Virgenes Canyon Open Space Preserve.
