MCNARY
OperatingHydro power plant
- Capacity
- 991 MW
- Primary fuel
- Hydro
- County
- Umatilla County
- Operator
- USACE NORTHWESTERN DIVISION
- Status
- Operating
- Commissioned
- 1953
- EIA plant ID
- 3084
- Coordinates
- 45.9338, -119.2976
MCNARY, a 991 MW Hydro power plant in Umatilla County, Oregon. Operated by USACE NORTHWESTERN DIVISION, commissioned 1953.
Weather peril exposure
MCNARY is a 991 MW hydro power plant in Umatilla County, OR, operated by USACE NORTHWESTERN DIVISION, commissioned in 1953. Umatilla County carries low modeled catastrophe exposure in the FEMA National Risk Index, scoring 1.3 of 5 at the 6th national percentile. Wildfire is the leading peril, rated Relatively Moderate by FEMA at the 91st percentile.
The Bywatts loss layer is calibrated to solar PV hardware, so it is not applied to a hydro plant. The ratings below are the FEMA National Risk Index county hazard ratings for this location.
Umatilla County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Wildfire | Relatively Moderate | 91st | 4.6 of 5 | <0.01 |
| Earthquake | Relatively Low | 81st | 4.2 of 5 | <0.01 |
| Heat wave | Relatively Moderate | 67th | 3.7 of 5 | 4.8 |
| Riverine flooding | Relatively Moderate | 52nd | 3.1 of 5 | 0.64 |
| Hail | Relatively Low | 17th | 1.7 of 5 | 0.39 |
| Strong wind | Relatively Moderate | 17th | 1.7 of 5 | 0.28 |
| Lightning | Relatively Low | 13th | 1.5 of 5 | 14.4 |
| Winter weather | Relatively High | 10th | 1.4 of 5 | 15.0 |
| Tornado | Very Low | 6th | 1.2 of 5 | 0.10 |
| Ice storm | Relatively High | 0th | 1.0 of 5 | 0.35 |
Perils not assessed in Umatilla County
These perils carry no usable National Risk Index figure for this county, so they are excluded from the scoring rather than scored zero. A zero would claim the peril was assessed and found benign.
| Peril | Why it is not scored |
|---|---|
| Hurricane | FEMA rating is "Not Applicable" for this county |
| Coastal flooding | FEMA rating is "Not Applicable" for this county |
Model hail, wind and flood exposure for Umatilla County in the weather risk calculator
Ratings are the FEMA National Risk Index county hazard ratings; the peril score is a Bywatts transform of the FEMA national percentile. Full data sources and the solar vulnerability methodology are in the weather risk calculator.
Modeled estimate for screening and negotiation. Built from FEMA National Risk Index county hazard data and a solar vulnerability layer documented above. Not a quote, a binder, or actuarial advice, and not a substitute for a carrier's own model. Hazard data: FEMA National Risk Index December 2025, synced 2026-07-24. Resolution is county level, not site level.