City vs city
Grass Ranch Colony vs Watertown, SD
Watertown currently scores 25 points higher overall than Grass Ranch Colony, with the largest gap in flood.
Use this comparison for relocation decisions, insurance shopping, and hazard-prioritized mitigation planning.
Hazard breakdown
Scores describe each city’s reference grid tile, not every property. A missing model is unavailable, not zero risk. Air quality uses an ingested EPA AirNow snapshot and may not reflect current conditions; other factors describe baseline exposure. The overall score blends different hazards and is not a probability of damage. Read the scoring methodology and sources.
Overall
Grass Ranch Colony: 25/100 · Watertown: 50/100
Watertown is 25 points higher.
Flood
Grass Ranch Colony: 0/100 · Watertown: 79/100
Watertown is 79 points higher.
Grass Ranch Colony: FEMA NFHL flood zones: 0 features intersect this tile.
Watertown: FEMA NFHL flood zones: 8 features intersect this tile.
Wind
Grass Ranch Colony: 22/100 · Watertown: 20/100
Grass Ranch Colony is 2 points higher.
Grass Ranch Colony: Wind exposure derived from ingested design wind / climatology tiles.
Watertown: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Grass Ranch Colony: 38/100 · Watertown: 42/100
Watertown is 4 points higher.
Grass Ranch Colony: Lightning exposure derived from ingested climatology tiles.
Watertown: Lightning exposure derived from ingested climatology tiles.
Tornado
Grass Ranch Colony: 0/100 · Watertown: 0/100
No gap.
Grass Ranch Colony: Tornado risk derived from NOAA SPC historical reports.
Watertown: Tornado risk derived from NOAA SPC historical reports.
Hail
Grass Ranch Colony: 30/100 · Watertown: 100/100
Watertown is 70 points higher.
Grass Ranch Colony: Hail risk derived from NOAA SPC historical reports.
Watertown: Hail risk derived from NOAA SPC historical reports.
Storm surge
Grass Ranch Colony: Unavailable · Watertown: Unavailable
A score difference cannot be calculated without both sources.
Grass Ranch Colony: Storm surge model is not available for this location yet.
Watertown: Storm surge model is not available for this location yet.
Wildfire
Grass Ranch Colony: 34/100 · Watertown: 38/100
Watertown is 4 points higher.
Grass Ranch Colony: Wildfire exposure derived from ingested fire potential tiles.
Watertown: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Grass Ranch Colony: Unavailable · Watertown: 21/100
A score difference cannot be calculated without both sources.
Grass Ranch Colony: Air quality model is not available for this location yet.
Watertown: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.