Flood Zone Comparison
Compare key metrics between 57645 57645, SD — Zone A and 80755 80755, CO — Zone AE. Data sourced from FEMA National Flood Hazard Layer (2025).
| Metric | 57645 57645, SD — Zone A | 80755 80755, CO — Zone AE |
|---|---|---|
| name | 57645 57645, SD — Zone A | 80755 80755, CO — Zone AE |
| zip code | 57645 | 80755 |
| city | 57645 | 80755 |
| state | South Dakota | Colorado |
| state code | SD | CO |
| category | High Risk | High Risk |
| flood zone | Zone A (High Risk — 100-Year Floodplain, No BFE) | Zone AE (High Risk — 100-Year Floodplain) |
| risk level | High Risk | High Risk |
| annual flood prob | 1% annual chance (100-year flood) | 1% annual chance (100-year flood) |
| insurance required | Required for federally-backed mortgages | Required for federally-backed mortgages |
| avg annual premium | 2,608 | 2,609 |
| base flood elevation | 28 ft | 10 ft |
| historical floods | 7 recorded flood events in the past 50 years. Most recent major flood: 2018 | 6 recorded flood events in the past 50 years. Most recent major flood: 2014 |
| nearest water | Rio Grande (0.8 miles) | Tampa Bay (4.1 miles) |
| elevation ft | 1,236 | 5,275 |
| population | 73,807 | 3,711 |
| median home value | 593,565 | 286,867 |
| flood damage risk | 40-60% chance of flood damage over a 30-year mortgage. Estimated average damage per flood event: $63,039 | 40-60% chance of flood damage over a 30-year mortgage. Estimated average damage per flood event: $55,194 |
| mitigation tips | Elevate utilities above base flood elevation; install sump pumps with battery backup; consider flood-proofing ground floor; maintain flood insurance; create an emergency evacuation plan; store important documents above flood level. | Elevate utilities above base flood elevation; install sump pumps with battery backup; consider flood-proofing ground floor; maintain flood insurance; create an emergency evacuation plan; store important documents above flood level. |
| fema map id | 4703C762J | 3060C691J |
| last updated | 2025-01-01 | 2025-01-01 |
Our team analyzes data from FEMA National Flood Hazard Layer to deliver accurate, up-to-date information. All data is verified and cross-referenced with official sources.