HEADGATE ROCK
OperatingHydro power plant
- Capacity
- 20 MW
- Primary fuel
- Hydro
- County
- La Paz County
- Operator
- COLORADO RIVER INDIAN IRR PROJ
- Status
- Operating
- Commissioned
- 1993
- EIA plant ID
- 7179
- Coordinates
- 34.1683, -114.2774
HEADGATE ROCK, a 20 MW Hydro power plant in La Paz County, Arizona. Operated by COLORADO RIVER INDIAN IRR PROJ, commissioned 1993.
Weather peril exposure
HEADGATE ROCK is a 20 MW hydro power plant in La Paz County, AZ, operated by COLORADO RIVER INDIAN IRR PROJ, commissioned in 1993. La Paz County carries low modeled catastrophe exposure in the FEMA National Risk Index, scoring 1.4 of 5 at the 10th national percentile. Riverine flooding is the leading peril, rated Relatively Moderate by FEMA at the 99th 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.
La Paz County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Riverine flooding | Relatively Moderate | 99th | 5.0 of 5 | 2.9 |
| Earthquake | Relatively Low | 80th | 4.2 of 5 | 0.04 |
| Wildfire | Relatively Low | 59th | 3.4 of 5 | <0.01 |
| Heat wave | Relatively Moderate | 45th | 2.8 of 5 | 16.0 |
| Strong wind | Relatively Low | 19th | 1.8 of 5 | 0.36 |
| Hail | Very Low | 13th | 1.5 of 5 | 0.06 |
| Lightning | Very Low | 4th | 1.2 of 5 | 24.5 |
| Tornado | Very Low | 3rd | 1.1 of 5 | 0.07 |
| Hurricane | Very Low | 1st | 1.0 of 5 | 0.02 |
| Winter weather | Very Low | 0th | 1.0 of 5 | 0.04 |
Perils not assessed in La Paz 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 |
| Ice storm | FEMA rating is "Not Applicable" for this county |
Model hail, wind and flood exposure for La Paz 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.