YONAH DAM
OperatingHydro power plant
- Capacity
- 23 MW
- Primary fuel
- Hydro
- County
- Stephens County
- Operator
- GEORGIA POWER CO
- Status
- Operating
- Commissioned
- 1925
- EIA plant ID
- 729
- Coordinates
- 34.6815, -83.3426
YONAH DAM, a 23 MW Hydro power plant in Stephens County, Georgia. Operated by GEORGIA POWER CO, commissioned 1925.
Weather peril exposure
YONAH DAM is a 23 MW hydro power plant in Stephens County, GA, operated by GEORGIA POWER CO, commissioned in 1925. Stephens County carries moderate modeled catastrophe exposure in the FEMA National Risk Index, scoring 2.5 of 5 at the 37th national percentile. Lightning 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.
Stephens County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Lightning | Relatively Moderate | 91st | 4.7 of 5 | 59.5 |
| Ice storm | Relatively Moderate | 82nd | 4.3 of 5 | 1.6 |
| Earthquake | Relatively Low | 77th | 4.1 of 5 | <0.01 |
| Hurricane | Relatively Low | 55th | 3.2 of 5 | 0.03 |
| Hail | Relatively Low | 49th | 3.0 of 5 | 4.6 |
| Tornado | Relatively Low | 49th | 2.9 of 5 | 0.10 |
| Wildfire | Very Low | 43rd | 2.7 of 5 | <0.01 |
| Strong wind | Relatively Low | 30th | 2.2 of 5 | 2.2 |
| Riverine flooding | Relatively Low | 27th | 2.1 of 5 | 0.50 |
| Winter weather | Very Low | 18th | 1.7 of 5 | 3.9 |
| Heat wave | Very Low | 13th | 1.5 of 5 | 1.4 |
Perils not assessed in Stephens 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 |
|---|---|
| Coastal flooding | FEMA rating is "Not Applicable" for this county |
Model hail, wind and flood exposure for Stephens 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.