Yukon-Koyukuk Census Area, Alaska
Yukon-Koyukuk Census Area covers 145,769 square miles of land. Below is what the Isopleth API returned at the Census Bureau's interior point for the county (65.37566, -151.57818) on 2026-10-29. The ground sits at 622 m (2,040 ft) on a 17.9° slope, the mapped soil is well drained, it is outside a mapped FEMA floodplain, the nearest 69 kV+ substation is 151.7 km (94.3 mi) away and a major road is 23.4 km (14.6 mi) away. Values describe that one point, not the whole county; look up your own address or coordinates for your site.
Sample point values
| field | value | source |
|---|---|---|
| Inside a mapped floodplain | No | FEMA_NFHL Federal Emergency Management Agency |
| Wildfire, annual frequency | 0.011 events a year | FEMA_NRI Federal Emergency Management Agencyvintage December 2025 |
| Tornado, annual frequency | 0.00030 events a year | FEMA_NRI Federal Emergency Management Agencyvintage December 2025 |
| Hail, annual frequency | 0.000045 events a year | FEMA_NRI Federal Emergency Management Agencyvintage December 2025 |
| On a mapped wetland | No | USFWS_NWI U.S. Fish and Wildlife Service |
| Nearest mapped wetland | 31 m | USFWS_NWI U.S. Fish and Wildlife Service |
| Elevation | 622 m (2,040 ft) | USGS_3DEP_COG U.S. Geological Surveyvintage 3DEP 1/3 arc-second seamless DEM |
| Slope | 17.9° | USGS_3DEP_COG U.S. Geological Survey |
| Soil drainage | Well drained | USDA_SSURGO U.S. Department of Agriculturevintage SSURGO AK765 mukey 3439066 |
| Soil hydrologic group | A | USDA_SSURGO U.S. Department of Agriculturevintage SSURGO AK765 mukey 3439066 |
| Farmland class | Prime | USDA_SSURGO U.S. Department of Agriculturevintage SSURGO AK765 mukey 3439066 |
| On protected land (PAD-US) | No | PAD_US USGS Protected Areas Database of the United States (PAD-US)vintage USGS PAD-US 4.1 (Protection Mechanism Category combined layer) |
| Surface manager | Private or unknown | BLM_SMA Bureau of Land Management |
| Solar resource (GHI) | 2.55 kWh/m²/day | JRC_PVGIS_NSRDB See source_url |
| Mean wind speed at 100 m | 7.8 m/s | GLOBAL_WIND_ATLAS_V3 See source_url |
| Nearest substation (69 kV+) | 151.7 km (94.3 mi) | EIA_POWER U.S. Energy Information Administration |
| Electric utility | GWITCHYAA ZHEE UTILITY CO | EIA_POWER U.S. Energy Information Administrationvintage HIFLD Electric Retail Service Territories |
| In a public water service area | No | EPA_CWS_SERVICE_AREAS U.S. Environmental Protection Agencyvintage V3.0 (2026-03-17) |
| Nearest major road | 23.4 km (14.6 mi) | OVERTURE_TRANSPORTATION © Overture Maps Foundation, © OpenStreetMap contributorsvintage 2026-10-21.0 |
| In an Opportunity Zone | Yes | HUD_OPPORTUNITY_ZONES U.S. Department of Housing and Urban Development |
Fields with no data at this point are left out. See the field catalog for all 351 fields.
Parcels
Parcel records: not offered in Alaska. Not statewide (20 local sources); licensing is per originating source. Every point field on this page still works at any coordinate in Alaska; see parcel coverage for the 35 states plus DC we cover.
Look up your own site
curl https://api.isopleth.dev/v1/fetch -H "Authorization: Bearer $ISOPLETH_KEY" \
-H "Content-Type: application/json" \
-d '{"lat": 65.375656, "lng": -151.578176, "preset": "site_selection"}'
Or ask your assistant through the MCP server: “Using Isopleth, check flood zone, wetlands, soils and distance to power for [your address in Yukon-Koyukuk Census Area, Alaska].”
Buying land here? Check the Land’s Yukon-Koyukuk Census Area page shows what its $29 report checks, built on these same Isopleth fields.
More in Alaska: North Slope Borough · Bethel Census Area · Alaska overview · all states