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Old Fort landslide update - June 21, 2020

The Ministry of Transportation and Infrastructure has provided this technical briefing regarding the Old Fort landslide: Back Scarp (Top of the Slide) – This is the furthest extent that the slide moved up the valley slope in 2018 and it is the same i

The Ministry of Transportation and Infrastructure has provided this technical briefing regarding the Old Fort landslide:

  • Back Scarp (Top of the Slide) – This is the furthest extent that the slide moved up the valley slope in 2018 and it is the same in 2020 and the height of the scarp is approximately 10 m. The movement to date this year is approximately 0.3 m.

  • Rotational Slide – the top part of the slide north of what is labelled the “scarp” and includes the area where the gravel stockpiles were in 2018 and is the area where the slide mass is rotating.

  • Scarp – an approximately 50 m high near-vertical slope below the area where the gravel stockpiles were in 2018. It is also the boundary where the slide changes from a rotational failure to a flow slide failure.

  • Ridge – a bedrock ridge that is on the eastern edge of where the slide is currently moving. The GPS monitor on the ridge is showing approximately 6 cm of movement.

  • Flow Slide – the portion of the slide that is flowing like a very slow-moving stream. This is the part of the slide that has moved the most since re-initiating this year. It has moved 80 to 100 m.

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Old Fort landslide through Old Fort Road, June 21, 2020. This portion of the slide that is flowing like a very slow-moving stream. This is the part of the slide that has moved the most since re-initiating this year. It has moved 80 to 100 metres. - Matt Preprost
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Old Fort landslide ridge, June 21, 2020. A bedrock ridge that is on the eastern edge of where the slide is currently moving. The GPS monitor on the ridge is showing approximately 6 centimetres of movement. - Matt Preprost
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Old Fort landslide scarp, June 21, 2020. An approximately 50 metre high near-vertical slope below the area where gravel stockpiles were in 2018. It is also the boundary where the slide changes from a rotational failure to a flow slide failure. - Matt Preprost

The Peace River Regional District has released this information about the needs of Old Fort residents:

The Peace River Regional District Emergency Operations Centre wants to thank all the residents that have completed the Old Fort Assessment survey, either with the Charlie Lake Fire Department or online. The information we collected has been summarized, and now we are going to work on addressing the needs of the residents at Old Fort. As of Sunday, June 21, 2020, the PRRD received 32 survey responses from the residents of Old Fort in regards to their current and future needs.

Of those households surveyed, the Peace River Regional District found that:

  • 91% do not have medical or mobility challenges that would impact their ability to leave.

  • 91% have enough food and water for the next 7 days.

  • 97% will not need sewage disposal in the next 7 days

  • 75% will not need water within the next 7 days

  • 65% will not need garbage disposal services within the next 7 days.

  • 50% of people intend to travel in and out of the community daily using their own means.

  • 65% of people will need assistance travelling in and out of the community on a daily or weekly basis

  • 13% planned to evacuate the area on June 21/20

  • 75% of people with pets would need assistance to evacuate (if evacuation is required)

  • 91% of people with livestock would need assistance to evacuate (if evacuation is required)

Emergency Support Services Update:

Emergency Support Services will continue to be available until Monday, June 29, 2020, only to those who have evacuated, if the road reopens during this time, ESS will be discontinued. As of June 21, 28 people have registered for ESS. You can register by calling 250-794-3310, Monday – Friday 1:00 pm – 4:00 pm.

Paperwork for extensions will be dropped off at hotels and those billeting can pick up paperwork tomorrow at Fort St John City hall between 8:30-4:30 pm this week.

Peace River Regional District Geotechnical Assessment Update:

In January 2020, the Peace River Regional District engaged the services of Tetra Tech to conduct a study of the Steep Slope Hazard Assessment. As part of this study, Tetra Tech will be conducting a field assessment of the area. Originally the field assessment was scheduled for March or April of 2020, but due to travel restrictions related to COVID-19, this was put on hold. As a result of the reactivated Old Fort Landslide, Tetra Tech is now in the area to conduct field observations and liaise with other geotechnical experts in relation to the study and the current landslide.

Please note that Tetra Tech geotechnical engineers may require access to private property to conduct field assessments during the week of June 21, 2020. Should Tetra Tech need to access your property they will first knock at your door to let you know they would like to access your property. If you are not home they will leave this notice on your door. They will not enter onto any properties without the assistance of property owners if gates are locked.

Read more: Old Fort on landslide alert

Email Managing Editor Matt Preprost at editor@ahnfsj.ca.