Disaster
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Utilities/supplies effected
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Risk / Impact
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Earthquake
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Communication
Electricity
Food
Isolation
Natural Gas
Shelter
Transportation
Water
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- There are many risk locations for earthquakes.
#1 is the Cascaded Subduction Zone earthquake with a possible risk of 9.0 magnitude with the real feel in our area of ~7.0 and a duration of 4 minutes. Risk is 14% of a magnitude > 9.0 and 37% of a magnitude >8.0 in the next 50 years. Wooden homes should endure the quake ok, but brick work, roads and bridges will be impacted. The West Union building has been seismically upgraded, so it should hold up ok. Major damage would be primarily on the coast due to the accompanied major tsunami (up to 90 feet) and significant damage would still occur to older and weaker buildings in the Willamette valley and all bridges across the major rivers. Transportation would be very limited due to I-5, Hwy 217 and Hwy 26 damage. Landslides likely in our ward boundaries, especially if the ground is wet. Expect days to weeks for emergency food, water and medical help to arrive. Expect weeks to months for utilities to be restored. Expect months to years before normal transportation to carry on. Aftershocks will continue for months to years.
#2 is the Oakfield fault that runs through the West hills within the Skyline Ward boundaries. Possible risk up to 7.0 magnitude causing significant damage to all aspects of life in our area. With the fault being in our boundaries, shifts in land will cause major devastation to those on/around the fault line.
#3 is the Portland Hills Fault. This runs on the Portland side of the West Hills with a possible risk up to a 7.0 magnitude quake.
#4 There are numerous other fault lines within 50 miles of the Skyline Ward.
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Heavy Rains / Flooding / Landslides
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Shelter
Transportation
Landslides effect: Communication, Electricity, Natural gas
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- Several high risk areas (Forest Heights area, Miller road, Skyline rd) for landslides which may damage homes or block roads. (see the attached Slope Hazard map).
- Low-lying areas (Kaiser rd north of Thompson Rd, Bethany/West Union, Cornell between 113th and 119th) may be affected by flooding which can limit transportation (See the attached Flood Map). Water damage possible in homes with basements or near wetlands.
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High Wind
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Communication
Electricity
Transportation
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- High winds likely in the hills of the Skyline Ward (Damage can occur especially when combined with ice or soaked ground) can bring down trees, knocking down power lines, telephone poles, and blocking roads. It is also possible that some individual homes may be damaged.
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Severe Winter weather: (Ice storms with wind, snow)
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Communication
Electricity
Isolation
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- Icy roads may trap individuals that live on steep roads/driveways.
- Trees may lose branches and knock down power lines and phone poles.
- Frozen pipes in houses
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Plague/ Flu pandemic
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Isolation
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- Long periods of quarantine may stress food reserves.
- Medical assistance may be needed by many
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Forest Park Fire
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Shelter
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- Localized transportation routes limited
- Smoke/ash or air quality concerns
- Evacuation of neighborhoods
- Loss of homes
- Smoke inhalation risk
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Flash Flooding (water tank Failure)
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Shelter
Transportation
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- Skyline Ward has several water tanks within its boundaries as well as major water pipes connecting them. This puts houses and roads, located below them, at high risk in the event of failure or earthquake. (see hazard maps)
Tanks include:
- Thompson road, just downhill from Hibbard rd (affected area: Bower Creek Estates)
- Under Bonny Slope park field off Thompson rd (affected area: homes downhill, south road)
- Langworthy Terr (affected area: possible wash out of Thompson Rd and draining into Mill pond)
- Uphill of 'Wismer Ridge' and 'Arbor View' neighborhoods.
- The NW corner of Cornell rd and Miller Rd
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Volcano (Lars, ash, flash flood)
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Electricity (low risk)
Isolation
Water
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- An eruption on Mt. Hood or Mt. St. Helens could impact the operability of hydro-electric power. The Bull-Run reservoir may be useless and high levels of ash will contaminate the open reservoirs in the Portland area.
- An eruption on other peaks will mostly cause potential problems with ash.
- Air quality effecting those with breathing issues
- Ash clean up
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Industrial accidents
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Natural Gas
Shelter
Transportation
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- The Skyline ward boundaries include a high volume liquid fuel linewhich runs north through 153rd, under 'Oak meadow estates' to between 'Finley Meadows' and 'Oakridge' neighborhoods then past the south-east corner of 'Arbor Heights' before heading over the hills to Portland.
- The Skyline ward boundaries also include a high volume natural gas line running through its northern border. It branches and has a main line that runs along the power lines between 'Bethany Terrace' and 'Bethany View Estates' and also between 'Arbor Estates' and 'OakRidge' neighborhoods before turning east along Springville rd.
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