Marshall 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 |
|---|---|---|---|
| Aug 10, 2020 | 213 hrs | 16,662 (95%) | Tornado |
| Feb 19, 2016 | 1 hrs | 11,052 (63%) | High Wind |
| Jul 19, 2018 | 78 hrs | 8,657 (50%) | Tornado |
| Nov 1, 2017 | 7 hrs | 7,750 (44%) | Frost/Freeze |
| Nov 6, 2017 | <1 hr | 7,442 (43%) | Unnamed event |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Marshall County, Iowa that day.
Over the 12 years from 2014 to 2025, Marshall County recorded 450 distinct power outage events, averaging 3.7 hours per event.
The single worst outage on record in Marshall County started August 10, 2020 (Tornado), lasting 213 hours and leaving up to 16,662 customers without power (95% of the county) at its peak.
June has historically been the worst month for outages in Marshall County, with 52 events recorded during that month across the dataset.
Based on this history, Marshall County earns a Reliability Grade of F, placing it in the 6th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Iowa
Counties with the closest reliability grade and national percentile to Marshall County.
| County | Grade | National percentile |
|---|---|---|
| Tama County | F | 12th |
| Jasper County | F | 14th |
| Poweshiek County | F | 15th |
| Linn County | F | 16th |
| Benton County | F | 18th |
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 Marshall County?
Between 2014 and 2025, Marshall County recorded 450 outage events, averaging 3.7 hours each.
What is Marshall County's reliability grade?
Marshall County has a Reliability Grade of F, in the 6th national percentile.
What was the worst power outage in Marshall County?
The worst outage on record started August 10, 2020 (Tornado), lasting 213 hours and affecting up to 16,662 customers.