CLARENCE CANNON
OperatingHydro power plant
- Capacity
- 58 MW
- Primary fuel
- Hydro
- County
- Ralls County
- Operator
- USCE-ST LOUIS DISTRICT
- Status
- Operating
- Commissioned
- 1984
- EIA plant ID
- 6140
- Coordinates
- 39.5248, -91.6441
CLARENCE CANNON, a 58 MW Hydro power plant in Ralls County, Missouri. Operated by USCE-ST LOUIS DISTRICT, commissioned 1984.
Weather peril exposure
CLARENCE CANNON is a 58 MW hydro power plant in Ralls County, MO, operated by USCE-ST LOUIS DISTRICT, commissioned in 1984. Ralls County carries high modeled catastrophe exposure in the FEMA National Risk Index, scoring 3.7 of 5 at the 67th national percentile. Riverine flooding is the leading peril, rated Very Low by FEMA at the 89th 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.
Ralls County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Riverine flooding | Very Low | 89th | 4.6 of 5 | 1.1 |
| Heat wave | Relatively Low | 75th | 4.0 of 5 | 9.5 |
| Hail | Relatively Low | 73rd | 3.9 of 5 | 3.9 |
| Earthquake | Very Low | 69th | 3.8 of 5 | <0.01 |
| Strong wind | Relatively Low | 68th | 3.7 of 5 | 4.0 |
| Ice storm | Very Low | 57th | 3.3 of 5 | 1.1 |
| Lightning | Very Low | 55th | 3.2 of 5 | 48.4 |
| Winter weather | Very Low | 48th | 2.9 of 5 | 9.6 |
| Wildfire | Very Low | 47th | 2.9 of 5 | <0.01 |
| Tornado | Very Low | 45th | 2.8 of 5 | 0.26 |
| Hurricane | Very Low | 12th | 1.5 of 5 | <0.01 |
Perils not assessed in Ralls 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 Ralls 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.