Water level gauges on the St. Mary's River are indicating rapidly changing water levels due to thunderstorm activity on Lake Superior. Southwest Pier Water levels dropped 13 inches between 645 AM and 800 AM.
Several cycles of water level falls and rises are likely prior to noon. Largest changes in water levels,up to 3 feet or more,can be expected on upper portions of the river from Point Iroquois to the locks at Sault Ste. Marie. Water level changes up to one foot can be expected from below the Soo Locks to Munuscong Lake.
Mariners should be aware of rapidly rising and falling water levels,particularly for operators above the Soo Locks. Be sure to monitor marine radio for information on this situation.
Water level gauges on the St. Mary's River are indicating rapidly changing water levels due to thunderstorm activity on Lake Superior. Southwest Pier Water levels dropped 13 inches between 645 AM and 800 AM. Several cycles of water level falls and rises are likely prior to noon. Largest changes in water levels...up to 3 feet or more...can be expected on upper portions of the river from Point Iroquois to the locks at Sault Ste. Marie. Water level changes up to one foot can be expected from below the Soo Locks to Munuscong Lake. Mariners should be aware of rapidly rising and falling water levels...particularly for operators above the Soo Locks. Be sure to monitor marine radio for information on this situation.
The Michigan Department of Environment, Great Lakes, and Energy (EGLE) has issued an Air Quality Alert for July 19 and July 20, 2026, for elevated levels of fine particulate due to wildfire smoke. Concentrations on Sunday will range from Unhealthy for Sensitive Groups (USG) in lower peninsula to Unhealthy across the upper peninsula. On Monday, USG concentrations are expected statewide.
This is a Statewide Air Quality Alert
Another smoke plume has settled over the region due to wildfires in Canada. The highest levels of fine particulate will be across the upper peninsula on Sunday. We expect the increased pollution to continue into Monday; however, levels will improve during the day as our winds shift to a southerly direction. With smoke lingering across the state, ozone also has the potential to increase quickly.
It is recommended that, when possible, you avoid strenuous outdoor activities, especially those with heart disease and respiratory conditions like asthma. Watch for symptoms including wheezing, coughing, chest tightness, dizziness, or burning in nose, throat, and eyes. You can help reduce air pollution by limiting activities, such as:
- outdoor burning;
- use of residential wood burning devices.
Tips for households:
- Keep windows closed overnight to prevent smoke from getting indoors and, if possible, run central air conditioning with MERV-13 or higher rated filters.
For up-to-date air quality data for Michigan visit the MiAir site: Michigan.gov/MiAir
For up-to-date air quality data nationally visit EPAs Air Now site: AirNow.gov
For further health information, please see MDHHS Wildfire Smoke and Your Health site: https://www.michigan.gov/mdhhs/safety-injury- prev/environmental-health/your-health- and-wildfire-smoke
Air Quality Alert Michigan Department of Environment, Great Lakes, and Energy July 19, 2026
The Michigan Department of Environment, Great Lakes, and Energy (EGLE) has issued an Air Quality Alert for July 19 and July 20, 2026, for elevated levels of fine particulate due to wildfire smoke. Concentrations on Sunday will range from Unhealthy for Sensitive Groups (USG) in lower peninsula to Unhealthy across the upper peninsula. On Monday, USG concentrations are expected statewide. This is a Statewide Air Quality Alert Another smoke plume has settled over the region due to wildfires in Canada. The highest levels of fine particulate will be across the upper peninsula on Sunday. We expect the increased pollution to continue into Monday; however, levels will improve during the day as our winds shift to a southerly direction. With smoke lingering across the state, ozone also has the potential to increase quickly. It is recommended that, when possible, you avoid strenuous outdoor activities, especially those with heart disease and respiratory conditions like asthma. Watch for symptoms including wheezing, coughing, chest tightness, dizziness, or burning in nose, throat, and eyes. You can help reduce air pollution by limiting activities, such as: - outdoor burning; - use of residential wood burning devices. Tips for households: - Keep windows closed overnight to prevent smoke from getting indoors and, if possible, run central air conditioning with MERV-13 or higher rated filters. For up-to-date air quality data for Michigan visit the MiAir site: Michigan.gov/MiAir For up-to-date air quality data nationally visit EPAs Air Now site: AirNow.gov For further health information, please see MDHHS Wildfire Smoke and Your Health site: https://www.michigan.gov/mdhhs/safety-injury- prev/environmental-health/your-health- and-wildfire-smoke Air Quality Alert Michigan Department of Environment, Great Lakes, and Energy July 19, 2026
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