Iosco CountyPower Outage History
What this grade means
Bottom 20% least reliable nationally — frequent and/or long outages. This county ranks in the least reliable fifth of all US counties in our dataset: some combination of frequent outages, long restoration times, or customers affected puts it near the bottom nationally. Backup power is worth prioritizing here rather than treating it as optional.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jul 19, 2020 | 55 hrs | 9,443 (66%) | Thunderstorm Wind |
| Apr 29, 2025 | 32 hrs | 8,777 (61%) | Unnamed event |
| Nov 5, 2022 | 20 hrs | 7,660 (53%) | Unnamed event |
| Nov 6, 2022 | 59 hrs | 7,026 (49%) | Unnamed event |
| Dec 16, 2021 | 82 hrs | 6,309 (44%) | High Wind |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Iosco County, Michigan that day.
Over the 12 years from 2014 to 2025, Iosco County recorded 773 distinct power outage events, averaging 5.3 hours per event.
The single worst outage on record in Iosco County started July 19, 2020 (Thunderstorm Wind), lasting 55 hours and leaving up to 9,443 customers without power (66% of the county) at its peak.
June has historically been the worst month for outages in Iosco County, with 94 events recorded during that month across the dataset.
Based on this history, Iosco County earns a Reliability Grade of F, placing it in the 3rd percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Michigan
Counties with the closest reliability grade and national percentile to Iosco County.
| County | Grade | National percentile |
|---|---|---|
| Arenac County | F | 3rd |
| Cheboygan County | F | 3rd |
| Otsego County | F | 4th |
| Crawford County | F | 4th |
| Clare County | F | 2nd |
Most reliable counties nationally
The top 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | South Dakota | A | 100th |
| Clearwater County | Minnesota | A | 99th |
| Limestone County | Alabama | A | 99th |
Least reliable counties nationally
The bottom 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | West Virginia | F | 0th |
| Lincoln County | West Virginia | F | 0th |
| Cameron Parish | Louisiana | F | 0th |
FAQ
How often does power go out in Iosco County?
Between 2014 and 2025, Iosco County recorded 773 outage events, averaging 5.3 hours each.
What is Iosco County's reliability grade?
Iosco County has a Reliability Grade of F, in the 3rd national percentile.
What was the worst power outage in Iosco County?
The worst outage on record started July 19, 2020 (Thunderstorm Wind), lasting 55 hours and affecting up to 9,443 customers.