Sherman CountyPower Outage History
2017–2025 · Oregon
Average — typical outage frequency and duration nationally. This county sits in the middle of the national distribution — its outage frequency and duration over the past 12 years are close to the nationwide median, neither notably better nor worse than most other US counties. A typical amount of backup-power preparedness is reasonable here.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Oct 5, 2025 | 4 hrs | 1,025 (57%) | Unnamed event |
| Aug 26, 2025 | 3 hrs | 1,022 (57%) | Unnamed event |
| Aug 23, 2025 | 5 hrs | 1,022 (57%) | Unnamed event |
| May 28, 2025 | 3 hrs | 1,019 (57%) | Unnamed event |
| Dec 26, 2023 | 3 hrs | 1,006 (56%) | Unnamed event |
Over the 9 years from 2017 to 2025, Sherman County recorded 74 distinct power outage events, averaging 3.7 hours per event.
The single worst outage on record in Sherman County started October 5, 2025, lasting 4 hours and leaving up to 1,025 customers without power (57% of the county) at its peak.
January has historically been the worst month for outages in Sherman County, with 10 events recorded during that month across the dataset.
Based on this history, Sherman County earns a Reliability Grade of C, placing it in the 56th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Sherman County's outage profile
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Read our mission →Similar counties in Oregon
Counties with the closest reliability grade and national percentile to Sherman County.
| County | Grade | National percentile |
|---|---|---|
| Coos County | C | 55th |
| Lane County | C | 53rd |
| Klamath County | C | 59th |
| Jefferson County | C | 53rd |
| Washington County | C | 53rd |
Most reliable counties in Oregon
The top 3 counties in Oregon by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Harney County | A | 94th |
| Wasco County | A | 93rd |
| Deschutes County | A | 87th |
Least reliable counties in Oregon
The bottom 3 counties in Oregon by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Clackamas County | F | 8th |
| Marion County | F | 12th |
| Lincoln County | F | 19th |
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 Sherman County?
Between 2017 and 2025, Sherman County recorded 74 outage events, averaging 3.7 hours each.
What is Sherman County's reliability grade?
Sherman County has a Reliability Grade of C, in the 56th national percentile.
What was the worst power outage in Sherman County?
The worst outage on record started October 5, 2025, lasting 4 hours and affecting up to 1,025 customers.