Winter Storm Ready


Weather in the Pacific Northwest can be tricky to navigate. That "mostly sunny" winter day can easily turn into a downpour, or even a slushy snowstorm with short notice, which is why we've created this Winter Storm Ready information page. The City has consolidated the information residents, business owners, and visitors need to safely navigate Mercer Island throughout winter storm season. FOR THE LATEST UPDATES ON CONDITIONS, SCROLL DOWN TO THE NEWS TAB BELOW.


Power Outages

Power outages can happen for a number of reasons, typically a fallen tree or too much snow/ice buildup on powerlines. The City does not own or manage these powerlines. Please call Puget Sound Energy (PSE) at 1-888-225-5773 to report outages and learn about service restoration. Customers can also view PSE's outage map with estimated power restoration times at www.pse.com/outage/outage-map. For more information, visit our article on Power Outages.

Excessive Rain and Increased Landslide Risk

Landslides develop during intense rainfall, runoff, or rapid snowmelt. The earth can move rapidly, sometimes with little or no warning. Mercer Island sees about 5-15 slides each year. To report a non-life-threatening landslide, call our regional, non-emergency 24-hour dispatch center (425) 577-5656. In the case of an emergency call 9-1-1. Visit our Landslide Safety article for more information.

Ice and Snow

The Public Works Department's goal is to provide sanding, plowing, and de-icing services on public streets when winter weather brings snow and ice, in order of priority.

In addition to plowing and sanding, crews often apply a pre-treatment of liquid deicer (see map) to other arterials located on steep hills and major intersections to help prevent minor ice build-up and make streets easier to plow. If compacted snow has already built up on the roadway, this deicer is less effective.

The City has six plows, three of which have sander units; one truck is used mostly for liquid de-icing. Follow this link for more information on the City's Snow and Ice Response Plan.

Your Resource for Up-to-Date Information and Safety Tips

During a major winter weather event, this page will be updated regularly with road closures/openings, City office and facility closures, safety tips, and more. Check back for updates or sign up to receive the Winter Weather E-Newsletter delivered straight to your inbox during weather event (see upper right-hand menu).


Weather in the Pacific Northwest can be tricky to navigate. That "mostly sunny" winter day can easily turn into a downpour, or even a slushy snowstorm with short notice, which is why we've created this Winter Storm Ready information page. The City has consolidated the information residents, business owners, and visitors need to safely navigate Mercer Island throughout winter storm season. FOR THE LATEST UPDATES ON CONDITIONS, SCROLL DOWN TO THE NEWS TAB BELOW.


Power Outages

Power outages can happen for a number of reasons, typically a fallen tree or too much snow/ice buildup on powerlines. The City does not own or manage these powerlines. Please call Puget Sound Energy (PSE) at 1-888-225-5773 to report outages and learn about service restoration. Customers can also view PSE's outage map with estimated power restoration times at www.pse.com/outage/outage-map. For more information, visit our article on Power Outages.

Excessive Rain and Increased Landslide Risk

Landslides develop during intense rainfall, runoff, or rapid snowmelt. The earth can move rapidly, sometimes with little or no warning. Mercer Island sees about 5-15 slides each year. To report a non-life-threatening landslide, call our regional, non-emergency 24-hour dispatch center (425) 577-5656. In the case of an emergency call 9-1-1. Visit our Landslide Safety article for more information.

Ice and Snow

The Public Works Department's goal is to provide sanding, plowing, and de-icing services on public streets when winter weather brings snow and ice, in order of priority.

In addition to plowing and sanding, crews often apply a pre-treatment of liquid deicer (see map) to other arterials located on steep hills and major intersections to help prevent minor ice build-up and make streets easier to plow. If compacted snow has already built up on the roadway, this deicer is less effective.

The City has six plows, three of which have sander units; one truck is used mostly for liquid de-icing. Follow this link for more information on the City's Snow and Ice Response Plan.

Your Resource for Up-to-Date Information and Safety Tips

During a major winter weather event, this page will be updated regularly with road closures/openings, City office and facility closures, safety tips, and more. Check back for updates or sign up to receive the Winter Weather E-Newsletter delivered straight to your inbox during weather event (see upper right-hand menu).

  • All Roads Are Open (January 15)

    7 days ago
    As of 6:15am, no new snow overnight and no known road closures. Be aware that side streets may still be icy from yesterday. City crews are monitoring conditions and responding as needed. Gusty winds may build this afternoon, causing limited blowdown trees.

    Recolgy collections will be attempted for Wednesday customers, but “Limited Access Routes" (i.e. the smaller trucks for narrow/steep roads & driveways) may not be possible. Please leave uncollected carts at the curb until 6:00pm; after that time, customers should pull in their carts. Unserviced customers will be able to put out up to 2x the amount of material...

    As of 6:15am, no new snow overnight and no known road closures. Be aware that side streets may still be icy from yesterday. City crews are monitoring conditions and responding as needed. Gusty winds may build this afternoon, causing limited blowdown trees.

    Recolgy collections will be attempted for Wednesday customers, but “Limited Access Routes" (i.e. the smaller trucks for narrow/steep roads & driveways) may not be possible. Please leave uncollected carts at the curb until 6:00pm; after that time, customers should pull in their carts. Unserviced customers will be able to put out up to 2x the amount of material on their next scheduled collection day. Contact Recology with questions at: (206) 381-6980 - affected customers will also receive an automated call.

    MISD is operating on a 2-hour delay this morning.

    Useful winter tips, and updates for larger events, are posted here and on City social media.

  • Evening Update (January 14)

    7 days ago
    Nws 01142020

    The National Weather Service in Seattle has shared the latest *estimated* snow totals for the region. This may vary due to the uncertainty in this developing event.

    City crews are on site and will be working throughout the evening. Their priority remains on de-icing roads. If the Island sees significant snow or ice, crews are prepared to close streets if deemed unsafe (view the Likely Street Closures Map for more information).


    Be aware that wet roads from today will freeze and could be icy for the morning commute.

    Check WSDOT for current conditions on I-90 Wednesday morning.

    The National Weather Service in Seattle has shared the latest *estimated* snow totals for the region. This may vary due to the uncertainty in this developing event.

    City crews are on site and will be working throughout the evening. Their priority remains on de-icing roads. If the Island sees significant snow or ice, crews are prepared to close streets if deemed unsafe (view the Likely Street Closures Map for more information).


    Be aware that wet roads from today will freeze and could be icy for the morning commute.

    Check WSDOT for current conditions on I-90 Wednesday morning.

  • All Roads Are Open (January 14)

    8 days ago
    As of 6:30am, there are no known road closures or other incidents to report on Mercer Island. City crews treated roads last night with deicer, and plows are out currently to address minor accumulations of snow on established plow routes.

    Due to the hard freeze, side roads are likely to be icy in places.

    Recology has implemented a 2-hour delay on compost/recycling/garbage collection this morning.

    Updates for larger snow events or closures will be posted here and on the City's social media sites.


    As of 6:30am, there are no known road closures or other incidents to report on Mercer Island. City crews treated roads last night with deicer, and plows are out currently to address minor accumulations of snow on established plow routes.

    Due to the hard freeze, side roads are likely to be icy in places.

    Recology has implemented a 2-hour delay on compost/recycling/garbage collection this morning.

    Updates for larger snow events or closures will be posted here and on the City's social media sites.


  • All Roads Are Open (January 13)

    9 days ago

    Winter roads update: As of 7:00am, there are no road closures or other incidents to report. City plows were out overnight and kept up with minor snow accumulations on established plow routes. Watch for icy conditions tonight!

    Winter roads update: As of 7:00am, there are no road closures or other incidents to report. City plows were out overnight and kept up with minor snow accumulations on established plow routes. Watch for icy conditions tonight!

  • Prepared for Snow (January 12)

    9 days ago

    Snow has started to fall in Eastside cities and Mercer Island crews are ready.

    Crews have been on site since late afternoon in anticipation of the weather.

    The City has six plows, three of which have sander units (one truck is used mostly for liquid de-icing). Top priority for Mercer Island crews will be primary routes that access I-90, schools and the Town Center, and other important arterials. When arterials are safe to travel, crews begin working next on residential streets. Crews also respond to snow and ice situations at the request of Mercer Island Police.

    For...

    Snow has started to fall in Eastside cities and Mercer Island crews are ready.

    Crews have been on site since late afternoon in anticipation of the weather.

    The City has six plows, three of which have sander units (one truck is used mostly for liquid de-icing). Top priority for Mercer Island crews will be primary routes that access I-90, schools and the Town Center, and other important arterials. When arterials are safe to travel, crews begin working next on residential streets. Crews also respond to snow and ice situations at the request of Mercer Island Police.

    For more information about the City's snow and ice response plan, click here.

    To report a snow/ice problem, or request sanding/deicing after a storm, please use the City's online service request portal MI-Connect (or download the app). This pushes requests directly into the workflow queue for City field crews.

    Check back regularly for more information.

    - - - - - - - - - -

    • Registered for an event at the Community Center? Click here for the MICEC's inclement weather policy.


    • Looking for information about how to stay safe on the road when it snows? Click here for winter driving tips.

    • Do your students attend Mercer Island schools? Visit the MISD Facebook page for information how to sign up for FlashAlert for the latest info on possible closures and delays.

  • MICEC Inclement Weather Policy

    9 days ago
    Leap snow 4feb2019 twt

    Daytime Classes & Programs
    Daytime classes and programs at the Community Center are canceled if the Mercer Island School District cancels classes due to severe weather conditions. If the Mercer Island School District is running 2 hours late, then morning classes (before 10:00 am) are canceled. A determination about afternoon and evening classes will be made by 2:00 pm. Facility operation and class cancelation information is recorded on the Inclement Weather Hotline at 206-275-7894.

    Make up classes will be rescheduled if possible, if not then a credit will be given for...

    Daytime Classes & Programs
    Daytime classes and programs at the Community Center are canceled if the Mercer Island School District cancels classes due to severe weather conditions. If the Mercer Island School District is running 2 hours late, then morning classes (before 10:00 am) are canceled. A determination about afternoon and evening classes will be made by 2:00 pm. Facility operation and class cancelation information is recorded on the Inclement Weather Hotline at 206-275-7894.

    Make up classes will be rescheduled if possible, if not then a credit will be given for the canceled class. It is the responsibility of each participant in Parks & Recreations programs to know if their program has been canceled due to school district delays or cancelations of school. If participants are unsure whether a program has been canceled, they can call the Inclement Weather Hotline at 206-275-7894 or go to the school district website at www.mercerislandschools.org. For all other cancelations, participants will be notified by either a staff member or the program instructors.

    Room Rentals
    If inclement weather affects the ability of the Mercer Island Community & Event Center (MICEC) to operate properly, and we need to cancel a room rental, then we will contact your rental group and provide a refund. If your group needs to cancel due to inclement weather but the MICEC remains open for business, then the rental cancelation policy will be in effect.

    For more visit http://www.mercergov.org/Page.asp?NavID=1938.

  • Are You Ready for Winter Driving?

    9 days ago
    Car in ditch 6feb2017

    Winter driving conditions have arrived. It's a good time to make sure you are prepared!

    • Make your vehicle is winter-ready (scrapers, jumper cables, sand, tire chains, flashlight, blanket, etc.)
    • Drive cautiously (slow, steady, headlights on, cruise control off, plan well ahead)
    • Make sure you know the forecast and WSDOT road status

    When ice, snow or freezing fog is expected in Mercer Island, City crews head out and pre-treat known trouble spots on roads and sidewalks with de-icer, which can help prevent slippery conditions.

    During snow cycles, City plow trucks clear and sand arterials, critical intersections, and major access routes...

    Winter driving conditions have arrived. It's a good time to make sure you are prepared!

    • Make your vehicle is winter-ready (scrapers, jumper cables, sand, tire chains, flashlight, blanket, etc.)
    • Drive cautiously (slow, steady, headlights on, cruise control off, plan well ahead)
    • Make sure you know the forecast and WSDOT road status

    When ice, snow or freezing fog is expected in Mercer Island, City crews head out and pre-treat known trouble spots on roads and sidewalks with de-icer, which can help prevent slippery conditions.

    During snow cycles, City plow trucks clear and sand arterials, critical intersections, and major access routes on and off the Island, followed by secondary and residential streets when time permits.

    All residents can help the City keep roadways clear and prevent accidents:

    The City does NOT plow private roads; find out if you live on one here.

    Winter Ready

    Regularly check the wipers, tires, lights, and fluid levels (radiator, windshield washer, power steering, oil and brakes). Make sure brakes and transmission are working properly.


    Your vehicle should be equipped with a winter emergency kit. The following items are recommended:

    • Ice scraper, snow brush, rags and paper towels.
    • Jumper cables, basic tool kit, antifreeze, and no-freeze windshield washer fluid.
    • Shovel, mats or old rugs for traction, tire chains, salt, sand or kitty litter.
    • Blankets or sleeping bag and extra clothing (e.g. hats, socks, waterproof boots, coat and gloves).
    • Non-perishable, high calorie food.
    • Candles, waterproof matches and metal container such as a coffee can for melting snow.
    • Flashlight and extra batteries, flares or roadway reflectors.
    • Basic first aid kits and fire extinguisher.

    Vehicle Operation

    Winter driving is often the most difficult driving due to blowing snow, icy slick spots and fewer daylight hours. When you are on the road you should:
    • Wear your seat belt!
    • Be prepared to turn back or seek shelter if conditions become bad.
    • Keep your windows clear of snow and ice. Do not start off until your windshield is defrosted.
    • DRIVE SLOWER and increase your following distance. Your speed should be adjusted for the conditions and flow of traffic.
    • Roadway conditions may vary widely due to sun, shade, or roadway surface. Watch for slick spots especially on bridges, overpasses, and shaded spots.
    • If the pavement is snow or ice covered, start slowly and brake gently. Begin braking early when you come to an intersection.
    • Be careful after a minor accident. If you do not feel comfortable exiting your vehicle, motion the other driver and drive to the nearest police station, 24-hour store, service station, hospital, or fire station.


    Stuck or Stranded

    If your vehicle breaks down, pull as far off the road as possible. Your greatest personal danger at this point is that of being hit by a passing vehicle. Don't panic. Do not over-exert yourself, especially when shoveling snow or pushing a stalled or stuck vehicle.

    If you are stranded on a well traveled road, wait for assistance from police or other emergency service providers. Raise the hood, turn on the dome light and flashers to make your vehicle more noticeable and attach a cloth to the antenna or windows.

    Other drivers who see stranded motorists can do them a favor by using a cellphone to call and report the exact location and description of the vehicle.


    Back Home

    When you return home from a winter trip, wash your vehicle to remove dirt and road salt. A coat of wax will help protect the finish from the effects of salt. Lubricate door and trunk locks to prevent them from freezing.


  • Snow and Ice Response Plan

    16 days ago
    Snowplow sander 4feb2019

    The Public Works Department's goal is to provide sanding, plowing,and de-icing services on public streets that allow traffic to enter and leave the Island safely when winter weather brings snow and ice.

    The City has six plows, three of which have sander units; one truck is used mostly for liquid de-icing.

    The top priority is the primary routes that access I-90, schools and the Town Center, and other important arterials. This includes arterials such as Island Crest Way, Gallagher Hill Road, East Mercer Way, West Mercer Way, North Mercer Way, Mercerwood Drive, SE 40th Street, SE 53rd Place, SE...

    The Public Works Department's goal is to provide sanding, plowing,and de-icing services on public streets that allow traffic to enter and leave the Island safely when winter weather brings snow and ice.

    The City has six plows, three of which have sander units; one truck is used mostly for liquid de-icing.

    The top priority is the primary routes that access I-90, schools and the Town Center, and other important arterials. This includes arterials such as Island Crest Way, Gallagher Hill Road, East Mercer Way, West Mercer Way, North Mercer Way, Mercerwood Drive, SE 40th Street, SE 53rd Place, SE 68th Street, 70th Ave SE, and 72nd Ave SE.

    In addition to plowing and sanding, crews also apply a pre-treatment of liquid deicer to other arterials located on steep hills and major intersections; this can help prevent minor ice build-up and makes treated streets easier to plow. See Deicing Pre-Treatment Locations Map for more information.


    When arterials are safe to travel, crews begin working next on residential streets. Crews also respond to snow and ice situations at the request of Mercer Island Police. Unfortunately, the City does not have the personnel or equipment to clear residential neighborhoods until the main arterials are clear and passable, and must prioritize time and resources.

    During major snowstorm events, crews will be focused solely on snow removal for priority routes.

    Click on the links below to see the latest maps:

    To report a snow problem, or request sanding/deicing after a storm, please use the City's online service request portal MI-Connect (or download the app). This pushes requests directly into the workflow queue for City field crews.


  • Power Outages

    16 days ago
    4100blk wmw blockage 6jan2019b

    Reporting an Outage

    The City does not own or manage powerlines. Please call Puget Sound Energy to report power outages and hear about service updates (number: 1-888-225-5773). Customers can also view an outage map with estimated power restoration times at www.pse.com/outage/outage-map.

    Please do not call 9-1-1 for non-emergency questions, such as power outage duration or reasons for the outage.

    What to Do During a Power Outage

    • Stay away from downed power lines and sagging trees with broken limbs. If you encounter downed power lines and no signage or utility crews in the area, call 9-1-1.
    • Turn off lights...

    Reporting an Outage

    The City does not own or manage powerlines. Please call Puget Sound Energy to report power outages and hear about service updates (number: 1-888-225-5773). Customers can also view an outage map with estimated power restoration times at www.pse.com/outage/outage-map.

    Please do not call 9-1-1 for non-emergency questions, such as power outage duration or reasons for the outage.

    What to Do During a Power Outage

    • Stay away from downed power lines and sagging trees with broken limbs. If you encounter downed power lines and no signage or utility crews in the area, call 9-1-1.
    • Turn off lights and electrical appliances except for the refrigerator and freezer. A closed refrigerator will stay cold for up to 12 hours.
    • Turn light switches and buttons on lamps or appliances to the “off” position.
    • Unplug computers and other sensitive equipment to protect them from possible power surges when the power is restored.
    • Leave one lamp on so you will know when power is restored. Wait at least 15 minutes after power is restored before turning on other appliances.
    • Never use gas ovens, gas ranges, barbecues or portable or propane heaters for indoor heating—they use oxygen and create carbon monoxide that can cause suffocation.
    • Use battery-operated flashlights or glow sticks for lighting vs. candles.

    For more information and safety tips visit the Washington State Department of Health's Power Outages information page.
  • Landslide Safety

    16 days ago
    Mi landslide example

    Mercer Island can be prone to natural hazards including flooding and landslides.

    To report a non-life-threatening landslide, call our regional, non-emergency dispatch center (425) 577-5656, open 24 hours a day, 7 days a week. In the case of an emergency always call 9-1-1.


    What is a Landslide?

    Landslides develop during intense rainfall, runoff, or rapid snowmelt, changing the earth into a flowing river of mud. They can flow rapidly, striking with little or no warning at avalanche speeds (faster than a person can run). In a landslide, masses of rock, earth or debris move down a slope. Debris...

    Mercer Island can be prone to natural hazards including flooding and landslides.

    To report a non-life-threatening landslide, call our regional, non-emergency dispatch center (425) 577-5656, open 24 hours a day, 7 days a week. In the case of an emergency always call 9-1-1.


    What is a Landslide?

    Landslides develop during intense rainfall, runoff, or rapid snowmelt, changing the earth into a flowing river of mud. They can flow rapidly, striking with little or no warning at avalanche speeds (faster than a person can run). In a landslide, masses of rock, earth or debris move down a slope. Debris and mud flows are rivers of rock, earth, and other debris saturated with water. Landslides can travel many miles from their source, growing in size as they pick up trees, boulders, cars and other materials. Debris flows don’t always stay in stream channels and they can flow sideways as well as downhill.

    Recognize the Warning Signs

    Fast-moving landslides and debris flows pose threats to life. Warning signs include:

    • Listen and watch for rushing water, mud, unusual sounds.
    • Unusual sounds, such as trees cracking or boulders knocking together, might indicate moving debris.
    • A faint rumbling sound that increases in volume is noticeable as the landslide nears.
    • Fences, retaining walls, utility poles, k-rails, boulders, or trees move.
    • Huge boulders in the landscape can be signs of past debris flows.

    Slow-moving landslides pose threats to property. Warning signs include:

    • Changes occur in your landscape such as patterns of storm-water drainage on slopes (especially the places where runoff water converges) land movement, small slides, flows, or progressively leaning trees.
    • Doors or windows stick or jam for the first time.
    • New cracks appear in plaster, tile, brick, or foundations.
    • Outside walls, walks, or stairs begin pulling away from the building.
    • Slowly developing, widening cracks appear on the ground or on paved areas such as streets or driveways.
    • Underground utility lines break.
    • Bulging ground appears at the base of a slope.
    • Water breaks through the ground surface in new locations.
    • Fences, retaining walls, utility poles, or trees tilt or move.
    • The ground slopes downward in one direction and may begin shifting in that direction under your feet.


    City Response

    As soon as the City learns of such an event, the City's Building Official travels directly to the affected site to assess the damage firsthand, and determine whether the buildings involved are still safe for occupancy. Unsafe buildings are "red-tagged" and may not be occupied until cleared by a geo-technical engineer, hired by the owner. You can help by making sure storm drains are clear in your neighborhood to help rain water flow away.

    More Information

    The City has consolidated links to more information, landslide hazard maps, and more. Click the links below for more information.

    Click here for a City informational handout on landslides and Mercer Island.

    Click here to view the City's landslide hazard map.

    Click here to view the USGS local website monitoring current rainfall and forecasting landslide potential.

    Click here for a factsheet on how landslides occur from the State's Geologic Hazards Program.

    Click here for general landslide information from FEMA.