McKillop Road has been the site of several landslides over the years leading to the destruction of part of the road and a number of houses. In some ways, it's been one long slide, sometimes moving faster, sometimes moving more slowly.
The first reported* slide occurred in 1935, when 3174 and 3168 McKillop began sliding. By September, they were sliding an estimated 4" per day, and the houses were evacuated. Some residents blamed the nearby Central Reservoir, but no concrete evidence of that was found at the time. City engineers reported that similar sliding had occurred in the same area in 1909. 3 The city authorized $500 to pay for a special study of the slide. 4 By January 1936, two houses had been moved, and the Chambers house had slid 25'. 5
Heavy rains in February 1942 led to 8 homes sliding. At least one resident moved out all his furniture, and stripped the home of its hardware. 6
The land continued sliding. A 1952 article about a slide noted that some houses had flexible gas lines installed to prevent them breaking as the houses shifted. One homeowner was a builder, and installed adjustable jacks under his house to account for the sliding. 7 A geologist and specialist in earth movement prepared a report which said no corrections would be effective "unless seepage from the reservoir is corrected." City engineer Earl Buckingham said "while I personally am not convinced that the reservoir was the original cause of the slide, I do believe it is a factor in the present phase of the slide movement." 8
There were delays and more finger-pointing, but the city agreed to share in the estimated $5,000 costs to address the problem by grading the area. The city council agreed to go ahead if 30 families in the area agreed to sign waivers releasing the city from liability. 9
1958 brought more storms, more worries, and additional sliding. And more disagreements about the cause. 10
Central Reservoir? Sausal Creek? Heavy rains? Underground wells? 14 Like many things, the causes are complicated; 11.12 it would be interesting to read geologist Charles H. Lee's writeup on the slide from 1944 for a hands-on, professional view. But some things are known; waterways erode the ground they flow through. Sausal Creek flows at the bottom of the slide area, and like other creeks in Oakland, the flow is highly seasonal. The highest flow comes at the end of heavy rains when the ground is the most saturated and most prone to sliding.
In my non-professional opinion, it's probably a combination of factors: cutting the road for development, building (including excavating for foundations) on filled material, and heavy rains all contributed to the initial* slide in 1935. Once the earth was moving, seepage from the reservoir, if any, would exacerbate the problem. Some of the attempts to fix the problem, like lining the creek with concrete, probably made the problem worse.
(* City engineers reported that sliding had occurred in the area in 1909, 3,14 before the Central Reservoir was built. It wasn't until roads and houses were built in the area that anybody else took notice.)
1970s to Present Day
Sliding has continued in the area. In 1971, EBMUD took the step of putting water lines on the surface as a precautionary measure. 13 At some point the Army Corps of Engineers apparently drove pilings into the ground to try to stabilize the area. In 1976, the city created William D. Wood Park, officially giving up on any attempts to re-claim the area for housing.
Sliding resumed during 2006 at the south end of McKillop Road, destroying two more homes along with the parking lot of the church there.
Links and References
- BANC PIC 2006.029 UC Berkeley Bancroft Library, San Francisco Examiner Collection
- Mt. Vernon Park Homes To Be Built Oakland Tribune August 14, 1927
- Families Flee Slipping Houses Oakland Tribune September 6, 1935
- City Acts On Foothill Blvd. Widening Job Oakland Tribune October 8, 1935
- Landslide Carries Home 25 Feet Down Oakland Canyon Oakland Tribune January 16, 1936
- 8 Oakland Homes Break Up In Slide Oakland Tribune February 9, 1942
- Hillside Home Owners Fight to Stem Slides Oakland Tribune March 30, 1952
- Council Will Ask EBMUD To Seek Slide Remedy Oakland Tribune April 4, 1952
- City To Share Cost of M'Killop Slide Oakland Tribune July 4, 1956
- McKillop Rd. Slide on Move; Officials Order New Study Oakland Tribune February 12, 1958
- Why McKillop Road Homes Were Destroy by Slide Oakland Tribune June 27, 1965
- The McKillop landslide: Ten years after Oakland Geology blog
- Water Pipes Surfaced Oakland Tribune December 8, 1971
- Houses Sinking; 2 Families Flee San Francisco Examiner September 6, 1935
- Little Stream Grows Up—Puts Skids Under Homes Oakland Tribune December 30, 1952
- Council Will Ask Advice On Landslide Oakland Tribune January 31, 1956
- McKillop Slide Action Postponed Oakland Tribune June 27, 1956
- McKillop Road Slide To Be Fenced For Safety Oakland Tribune April 12, 1957
- New Storm To Hit Bay; More Slides Oakland Tribune February 11, 1958