San Juan County, Utah
San Juan County covers 7,824 square miles of land. Below is what the Isopleth API returned at the Census Bureau's interior point for the county (37.60263, -109.79157) on 2026-10-29. The ground sits at 2,191 m (7,188 ft) on a 14.5° slope, the mapped soil is well drained, it is outside a mapped FEMA floodplain, the nearest 69 kV+ substation is 26.5 km (16.4 mi) away and a major road is 4.5 km (2.8 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 | 0.00088 events a year | FEMA_NRI Federal Emergency Management Agencyvintage December 2025 |
| Tornado, annual frequency | 0.045 events a year | FEMA_NRI Federal Emergency Management Agencyvintage December 2025 |
| Hail, annual frequency | 0.053 events a year | FEMA_NRI Federal Emergency Management Agencyvintage December 2025 |
| Current drought category | D2 | USDM_CURRENT The U.S. Drought Monitor is jointly produced by the National Drought Mitigation Center at the University of Nebraska-Lincoln, the United States Department of Agriculture, and the National Oceanic and Atmospheric Administration. Map courtesy of NDMC.vintage US Drought Monitor map valid 20261020 |
| On a mapped wetland | No | USFWS_NWI U.S. Fish and Wildlife Service |
| Elevation | 2,191 m (7,188 ft) | USGS_3DEP_COG U.S. Geological Surveyvintage 3DEP 1/3 arc-second seamless DEM |
| Slope | 14.5° | USGS_3DEP_COG U.S. Geological Survey |
| Soil drainage | Well drained | USDA_SSURGO U.S. Department of Agriculturevintage SSURGO UT638 mukey 55474 |
| Soil hydrologic group | D | USDA_SSURGO U.S. Department of Agriculturevintage SSURGO UT638 mukey 55474 |
| Farmland class | Prime | USDA_SSURGO U.S. Department of Agriculturevintage SSURGO UT638 mukey 55474 |
| Land use | Forest | USFS_LCMS USDA Forest Servicevintage USFS LCMS CONUS 2025 annual (30 m) |
| Crop or cover (CDL) | Evergreen Forest | USDA_CDL U.S. Department of Agriculturevintage USDA CDL 2025 (30 m) |
| Tree canopy | 18% | USFS_NLCD_TCC USDA Forest Servicevintage USFS/MRLC NLCD Tree Canopy Cover (latest annual, 30 m) |
| On protected land (PAD-US) | Yes | 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 | Blm | BLM_SMA Bureau of Land Management |
| Annual precipitation (normal) | 365 mm (14 in) | NOAA_NCEI_NORMALS_GRIDDED National Oceanic and Atmospheric Administrationvintage NOAA NCEI 1991-2020 gridded (nClimGrid) monthly normals v1.0, annual layers |
| Days above 32 °C a year | 21 days | NOAA_NCEI_NCLIMGRID_DAILY National Oceanic and Atmospheric Administrationvintage NOAA nClimGrid-Daily v1.0 (scaled), 1991-2020 mean annual day counts |
| Solar resource (GHI) | 5.24 kWh/m²/day | JRC_PVGIS_NSRDB See source_url |
| Mean wind speed at 100 m | 6.2 m/s | NREL_WIND_TOOLKIT NREL WIND Toolkit (Draxl et al., 2015)vintage NREL WIND Toolkit CONUS v1.0.0, 2007-2013 (5-min, 2 km) |
| Wind capacity factor | 29% | NREL_REV_LANDBASED_WIND_SC_2024 NREL reV supply curves, Open Energy Data Initiative (OEDI)vintage NREL reV land-based wind SC 2024 (Open access) |
| Nearest substation (69 kV+) | 26.5 km (16.4 mi) | EIA_POWER U.S. Energy Information Administration |
| Nearest gas pipeline | 71.4 km (44.3 mi) | EIA_ATLAS U.S. Energy Information Administration |
| Electric utility | PACIFICORP | 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 | 4.5 km (2.8 mi) | OVERTURE_TRANSPORTATION © Overture Maps Foundation, © OpenStreetMap contributorsvintage 2026-10-21.0 |
| In an Opportunity Zone | No | 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: 1,600,059 parcels in 29 counties. San Juan County has 8,700 of them. Published by Utah Geospatial Resource Center; county recorders/assessors (Public, attribution); Per-county snapshots (most counties 2026), refreshed quarterly.
Share of parcels with each column filled: site address 78%. Not published here: owner name, total value, land use, sale date, zoning, year built.
Look up your own site
curl https://api.isopleth.dev/v1/fetch -H "Authorization: Bearer $ISOPLETH_KEY" \
-H "Content-Type: application/json" \
-d '{"lat": 37.602633, "lng": -109.791574, "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 San Juan County, Utah].”
Buying land here? Check the Land’s San Juan County page shows what its $29 report checks, built on these same Isopleth fields.
More in Utah: Tooele County · Millard County · Utah overview · all states