5. Laguna Beach,
Orange County (OES Mission
#98-SOU6117). On 02/24 DMG evaluated
artificial fill pad erosion downslope
from Top of the World School. The school
is set back about 30 feet from the edge
of the fill. Erosion of silty sand
caused deep gullies where an engineered
fill drain had failed. DMG determined
there was no imminent danger to the
building from landsliding; however,
continued erosion of the fill could
result in potential landsliding if not
properly mitigated. The school's
consultant was also on site. A report
prepared by DMG geologist Russell Miller
was released 03/17.
14. Laguna Beach,
Orange County (OES Mission
#98-SOU6123). On 03/23 OES requested
technical assistance on the geologic
analysis of slopes, that are in
continued threat of mudslides and
landslides, for preliminary
determination of potential slope
movement and mitigation suggestions. A
report prepared by DMG geologist Tan was
released 04/17. On 12/06/97 three
beach-side homes were evacuated and 20
others were severely damaged (Tan,
02/11). On 02/17 a hill slipped and sent
boulders tumbling toward a restaurant
(Tan, 02/19). On 02/22 Laguna Canyon
Road was closed due to mudslides (Tan,
03/05). On 02/23 in Canyon Acres, a home
partially collapsed under a slide, and
part of a bungalow on Victory Walk was
crushed. Other slide areas include
Laguna Canyon Road, Bluebird Canyon
Drive and a trailer park near Aliso Pier
(Tan, 03/05). On 02/24 the rainfall
forced 550 people from their homes. A
wall of mud roared down hillsides,
killed one man, injured nine people and
destroyed four homes in the Castle Rock
community. One man was killed when a
mudslide slammed into his cottage on
Victory Walk. On Canyon Acres Drive,
three houses were destroyed and five
others damaged. Damaged houses were
reported in Laguna Canyon Road. A total
of at least 14 homes and several
businesses were destroyed (Tan, 03/05).
On 02/25 a wall of mud in Laguna Beach
Canyon killed one person and injured 10,
two homes were damaged, and eight homes
were evacuated (Gerry Wieczorek, USGS).
On 02/26 city officials alerted the
residents of 25 canyon homes that their
properties might be unsafe based on a
city-hired geologist investigation (Tan,
03/05).
15. Laguna Niguel,
Orange County. On 12/05/97 the storm
increased movement on a landslide in
Laguna Niguel and damaged five
condominiums which were abandoned (Tan,
02/11). On 03/18 a crumbling hillside
threatened to destroy at least 14 homes
in Laguna Niguel. For at least five
years, the 125 feet high slope has
slowly slipped. The storms in December
accelerated its movement and forced the
evacuation of five homes at the top of
the slope on Via Estoril Drive and five
condominiums at the bottom of San Felipe
Drive; additionally, four condominiums
were threatened. The backyard of one of
the Via Estoril homes dropped up to five
feet (Tan, 04/02). On 03/19 two houses
on Via Estoril collapsed. Seven more
houses at the same street were
threatened and evacuated; twelve
condominiums were damaged and nine more
evacuated (Tan, 04/02). On 03/20 a third
home on Via Estoril toppled down the
headscarp of the landslide (Tan 04/02).
On 03/24 DMG received one other report
from the USGS of continued movement on
the Laguna Niguel landslide where at
least 10 condos were evacuated and five
were destroyed. On 03/29 a fourth house,
adjacent to the other three collapsed
homes on Via Estoril, split in half and
plunged into the graben of the slide
(Tan, 04/02)
16. Various
locations, Orange County. On 12/06
floods and mudslides were reported in
Costa Mesa, Irvine, Lake Forest, San
Juan Capistrano, and Laguna Beach.
Mudslides occurred in Black Star, Baker,
and Santiago Canyons. Many road closures
were reported along the Santa Ana
Freeway at Laguna Freeway, Laguna Canyon
Road, Pacific Coast Highway in Newport
Beach and in Huntington Beach (Tan,
02/11). On 02/17 runoff undermined
sections of Santiago Road in Orange
County (Tan, 02/19). On 02/23 the storm
forced the evacuation of eight to 10
residents in Holy Jim Canyon near the
Orange - Riverside County line; a
half-dozen other residents declined to
move despite the growing slide threat
(Tan, 03/05).
17. City of
Orange, Orange County. On 12/23
movement of an active landslide in the
Anaheim Hills accelerated. The
landslide, which is located within a DMG
mapped landslide area (Tan, DMG OFR
95-11), has been active for the past two
years. This "Vista Summit Way" landslide
damaged two to three houses and affected
three city blocks. The engineer with the
City of Orange has been in contact with
DMG concerning this matter (Tan, 02/19).
18. Silverado
Canyon, Orange County. On 12/06 four
homes were condemned and evacuated due
to a mudslide and rockfall (Tan, 02/11).
On 02/23 one home was endangered in
Silverado Canyon (Tan, 03/05).
19. Modjeska
Canyon, Orange County. On 02/23 at
least one house was damaged by mud (Tan,
03/05).
27. Los Angeles,
Los Angeles County. On 02/06, mud
crashed into an apartment building in
Westlake area after the storm toppled a
15 foot retaining wall; more than 100
residents were evacuated. Water swept
across Pacific Coast Highway and the
Ventura, Harbor and Santa Ana Freeways
(Tan, 02/11). On 02/13 a home in Los
Feliz was declared unsafe because rains
had eroded its foundation (Tan, 02/19).
On 03/01 a slide rumbled down a slope
and flattened a house in the 3900 block
of Eureka Drive in Studio City, pushing
it into a backyard swimming pool. The
houses on both sides of the pancaked
house were yellow-tagged. The slope
failure left four other homes (on Laurie
Drive) perched precariously at the edge
of an abyss. The residents had left the
destroyed house after the City of Los
Angeles red-tagged the structure as a
precaution (Tan 03/05). On 03/01 a
moderate-size landslide cascaded from a
steep slope in Studio City and destroyed
a house and several cars. The house had
been evacuated due to concerns about the
stability of the slope. This slide
occurred more than five days after the
rain stopped and illustrates the problem
of delayed triggering of deeper
landslides (Sue Cannon, USGS, 03/02). On
03/01 in the San Fernando Valley, the
City of Los Angeles red- or
yellow-tagged about 50 dwellings in
danger of mudslide hazard in recent
weeks, mostly along the slopes of Santa
Monica Mountains (Tan, 03/05).
28. Newport Beach,
Orange County. On 02/06 a mudslide
crushed two cars (Tan, 02/11). On 02/26
parts of a yard tumbled from a hilltop
home on Muir Beach Circle, blocking off
an area of Goleta Point Drive, in the
Spyglass Hill area (Tan, 03/05).
30. Malibu, Los
Angeles County. On 12/06/97 homes in
Malibu were damaged by waves and
seacliff erosion. On 02/07 Malibu Canyon
Road closed due to mudslides and
rockfalls (Tan, 02/11). On 02/08 an
ocean-eroded cliff buckled, causing one
home to collapse and two others
threatened. The homes along Broad Beach
Road were undermined by high tides (Tan,
02/11). On 02/16 several houses along
the beach of Malibu were damaged by the
high surf and rainstorms (Tan, 02/19).
On 02/23
Pacific Coast
Highway, Topanga Canyon Boulevard, and
Malibu Canyon Road were blocked by
mudslides. A Union Pacific railroad
trestle was undermined by the surging
flows of the Ventura River and was not
reopened to rail traffic for weeks (Tan,
03/05). On 02/24 in Malibu’s Las Flores
Canyon, officials called for evacuation
of about a dozen homes because of
unstable ground. Also, more mudslides on
Pacific Coast Highway forced officials
to close the local courthouse (Tan,
03/05). On 02/25 a 140-foot-long
retaining wall partially collapsed,
damaging two homes above the slide on
Calle del Barco. The 20-year-wall, along
a narrow road (Rambla Orienta) just
above Pacific Coast Highway, began to
give away during the evening of 02/24
(Tan, 03/05).
31. Santa Barbara,
Santa Barbara County. On 02/07
officials closed roads because of
mudslides and evacuated a mobile home
park (Tan, 02/11). A Sycamore Canyon
home was ripped from its foundation by a
mudflow. No injuries were reported (Wieczorek,
02/25).
32. San Clemente,
Orange County. On 02/08 high tide
and rain caused damage to shoreline
properties; nine homes at a mobile home
park were damaged (Tan, 02/11). On 03/01
a landslide forced the evacuation of
four homes in the 300 block of Paseo de
Cristobal, piled dirt and large boulders
onto the railroad tracks and cut off
rail service. One of these houses was
condemned (Tan, 03/05).
33. Dana Point,
Orange County. On 02/08 the Holiday
Inn Express was evacuated when a
mudslide flowed into the underground
parking structure. Cars flowed out of
the building into the street with the
mud (Tan, 02/11).
34. Brea, Orange
County. On 02/08 a rock and mudslide
closed the Carbon Canyon Road. Other
road closures occurred at Pacific Coast
Highway, Laguna Canyon Road, and El Toro
Road (Tan, 02/11). On 02/24 Carbon
Canyon Road was closed, after a hillside
slid across half of the road at the La
Vida Hot Springs Resort (Tan, 03/05).
37. San Fernando
Valley, Los Angeles County. On 02/13
a rain-soaked hillside collapsed in West
Hills, Canoga Park, tearing away a
garage, forcing the evacuation of five
homes and threatening several other
residences farther down the hill. The
slide ripped a 200 feet long, 30 feet
deep gash under a house, leaving a
bedroom dangling over a chasm. The
garage slid down slope 12 to 30 feet and
20 feet away (laterally), with a car
still parked inside, and was wedged
against the back of a downslope home
(Tan, 02/19).
38. Ventura,
Ventura County. On 02/14 a hillside
gave way and an oil pipeline ruptured,
sending 8000 gallons of crude oil
flowing into the ocean and severing a
natural gas line that sparked a 100
foot-flame (Tan, 02/19). On 02/22 ten
people were evacuated from an apartment
building threatened by a mudslide; 12
families were forced to flee from
another building on the same block of
west Ventura’s Cedar Street. A mudslide
caused the rupture of a crude oil
pipeline in the hills north of Ventura,
spilling 168 gallons (Tan, 03/05). On
02/16 storms brought debris down at the
bottom of Hall Canyon to form a small
lake. Residents of 50 homes were
notified that the dam might break and
were required to evacuate. Residents of
an additional 100 homes were notified
that they may have to evacuate (Tan,
02/19). A 12-unit hillside apartment
building was flattened by a mudslide;
300 residents were evacuated (Wieczorek,
02/25). On 03/03 previous shallow seated
failures turned into deeper-seated
failures; 20 percent of the buildings
were red- or yellow-tagged (Bob Prodehl,
City of Ventura). Well heads in the
Ventura fields were damaged due to
landslide activity (Ken Henderson,
Division of Oil and Gas, 03/13).
39. Bel Air and
Culver City, Los Angeles County. On
02/16 shallow slope failures affecting
houses occurred in Bel Air and Culver
City (Tan, 02/19).
41. Hollywood
Hills, Los Angeles County. On 02/23
the storm threatened houses on an
unstable hillside (Tan, 03/05).
42. Sherman Oaks,
Los Angeles County. On 02/25 a slope
failure along a 60-foot-long section of
hillside closed a stretch of the 14800
block of Mullholland Drive (Tan, 03/05).
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