All these showers can bring lots of flowers. For the last 40 years, there has been a telephone hotline to find out what the status is of the wildflower bloom and where to see it.
Find out more at the Theodore Payne Foundation‘s website
or
call (818) 768-1802 ext 7.
I-5 between Santa Clarita and the San Joaquin Valley over Tejon Pass is known as “The Grapevine” and formerly known as “The Ridge Route”. It is an important corridor in California and has been so since 1915. Travel over the route can be quite treacherous in winter due to both rain and snow. Mudslides, rockfalls, and ice can all wreak havoc on travel. Collisions can mar traffic for miles. Caltrans, CHP, and the County of Los Angeles work together to ensure safe travel over the route. Sometimes this can result in a full closure of the pass.
To stay up-to-date on current conditions, we recommend the following sites:
Weather Forecasts from the National Weather Service:
Be safe out there and always use caution during winter months when traveling the “Grapevine”.
STATS:
Highest elevation – 4144′ at Tejon Pass
Normal Closure Points:
ALTERNATE ROUTES:
If the 5 is closed, alternate adjacent routes such as Lake Hughes Road are not advisable as they may be in worse condition or be heavily congested. Depending on closures, the best alternative to I-5 is via State 14 (Antelope Valley Freeway) and State 58 over Tehachapi Pass. In times of heavy snow, your only option may well be US 101 to State 46 in Paso Robles. Check with Caltrans and CHP prior to travel to make sure these roads are open. DO NOT ALWAYS TRUST GOOGLE. It can lead you down bad or otherwise unsuitable roadways. In January 2021, multiple people including three big rigs were trapped on the Old Ridge Route during a snowstorm when they attempted to bypass a closed I-5. We don’t want you to end up on the news. Always be safe and always use caution on unfamiliar roads.
SPECIAL NOTE:
The Old Ridge Route (Ridge Route Road / 8N04) is NEVER an alternate to I-5 under any conditions and is not suitable for heavy traffic nor is it open to through traffic. It is closed to through travel from Castaic to Gorman (State 138).
For local roadways, there are additional resources available on this site on our Southern California Highway Resources page.
Winter in southern California can be quite an adventure at times. Some storms leave few routes open out of the Los Angeles area to points north and northeast. Some of these storms can really hamper travel out of the area.
In late December 2019, a storm closed State 33, I-5, State 14, State 138, I-15 (in two sections), and many other roads in the region. What road is open? When will it open? Are chains required? All of these questions and more can be easily answered through Caltrans, the State Highway department. They have a really good phone app and website – Quickmap – which gives all this information in an easy format. Caltrans Quickmap has numerous layers that can be added such as traffic speeds, CHP Incident Reports (collisions, hazards, fire information), road closures, snowplow locations, lane closures, CMS messages, and more.
In addition to Quickmap, all the Caltrans traffic cameras are available online at Caltrans Video, some of which are streaming live. I strongly recommend these links to get you where you need to go. Another page, also from Caltrans, covers ALL their available data – Caltrans Commercial Wholesale Web Portal . I use Quickmap quite often even just for basic traffic needs.
San Diego’s Mission Valley has changed quite a bit over the last century. It has gone from farms to condos. Dairys to grocery stores. Dirt roads to major freeways. In 1947, the first iteration of the current State 163 / I-8 interchange was completed as shown here. Left on and offramps were the order of the day. Challenge Dairy’s San Diego headquarters can be seen in the upper left corner of the interchange. Additional changes to the junction took place in 1959, 1978, and 1991. All of these bridges have been replaced but their legacy remains today with the outer ramps on either side of the 8.
Southern California has many faults, some hidden, some very obvious. One of the more fun aspects of geology is to see where the land moves. To witness the power of what Earth can do can be quite awe inspiring. Some features are easily recognizable, such as the San Gabriel Mountains which have somewhat rapidly risen due to faulting. Other features are less apparent in the modern urban environment, such as “setbacks” along major fault zones. This page will showcase some of the more visible fault features throughout Southern California.
NOTICE: Some of these locations are either along major roadways or in residential areas. Please use caution when visiting these sites and be respectful of those living there. Parking regulations vary at each site so be aware before you park.
Maps used are courtesy Google Earth and USGS Quaternary Faults layer – adapted by Michael F Ballard.
San Fernando Valley
On February 9, 1971, an M6.6 earthquake struck early in the morning in the northwestern San Fernando Valley. This quake, known as the 1971 Sylmar / San Fernando Earthquake caused a great deal of damage from collapsed buildings, pipeline breaks, downed powerlines, and collapsed freeways. The damage was gradually repaired but some evidence remains today.
A fault scarp along with a deflected curb can be seen quite readily on Cometa Ave, just east of Fernmont St. The front yard at 12676 Cometa Ave abruptly rises from street level at an angle. Looking west from this location, you can see a slight bend in the curb on the south side, another reminder of the 1971 quake.
Imperial Valley Scarps and Offsets
Numerous earthquakes in the Imperial Valley have produced a significant amount of surface rupture. Evidence of these ruptures can still be seen today in many parts of the valley. Two areas of interest can be visited. One in the western end of the valley and another southeast of Brawley.
Western Imperial Valley
Earthquakes in 1968 and 1987 produced a small amount of surface rupture along the Superstition Hills Fault Zone, which is an extension of the Elsinore Fault Zone. This is visible today as a low “mole track” which follows the fault line and cracks in the roadway on Imler Road where it makes a big bend at Huff Road. This track can be followed for many miles across the desert but be cautious as the area surrounding the roadway is a military bombing area.
Southern Imperial Valley
On May 18, 1940, an Mw 6.9 earthquake struck in the Imperial Valley along the Imperial Fault. The quake caused a lot of damage to buildings and infrastructure. It produced a significant amount of surface rupture as well, which offset canals and roadways. Additional events in 1966 and 1979 increased the offset. The fault zone can be followed quite easily today by tracking the broken and offset pavement as well as shifted canals.
Older seismic events in Southern California also leave their marks. A fault scarp along the Sierra Madre Fault is visible in the foothills above Etiwanda.
At the northern end of Etiwanda Avenue and a short hike later, you can walk along the scarp of the Sierra Madre Fault. This section hasn’t broken in a long time but is still quite active, as the freshness of the scarp suggests. This can be traced along the foothills of the San Gabriel Mountains for many miles where it hasn’t been erased by development or erosion.
Of course, no fault tour of Southern California is complete without the San Andreas Fault. The fault has numerous and visible features.
Alquist-Priolo Zoning Act
Not all faults need to produce recent surface rupture to be considered a problem. In 1972, the Alquist-Priolo Zoning Act was passed by the California legislature which required setbacks and additional building requirements surrounding fault zones. How wide a zone was dependent on how large an earthquake could be expected from that fault. Any fault that was capable of causing surface rupture got special attention. An example of these setbacks can be seen in Santa Clarita along Newhall Ranch Road between Hillsborough Pkwy and Dickason Dr / Ave Tibbets. A large shopping center called Bridgeport Marketplace was constructed atop the San Gabriel Fault Zone. A large setback was required for construction, which can be seen by the very wide separation of structures and the more unusual location of the parking lot. Normally such centers have the parking adjacent to the roadway. In this case, it is behind the structures.
