Map tools

Run width ft

State Resort

Basemap Hillshade Canopy dots Resort bounds Runs Lifts

Layers

Data

Active wildfires NIFC perimeters, updated every 5 min All ski areas Every mapped boundary in view Fuel model LANDFIRE FBFM40 surface fuels Canopy cover LANDFIRE EVC, percent tree cover

Display

Dark mode Dark interface and basemap Overlay opacity

Fall Line

Draw the fall line, set a width, and read the rating.

Nothing drawn yet

Pick a state and a resort to drop onto its boundary, or just navigate to the terrain you care about.

Draw the fall line from the top of the pitch to the bottom, then set a width and press Build from fall line. If you want an exact shape instead, trace the run boundary by hand.

Resort boundaries, runs and lifts come from OpenStreetMap, © OpenStreetMap contributors under the ODbL. Terrain comes from USGS 3DEP at 10 m. Canopy cover, height and vegetation type come from LANDFIRE at 30 m. Both are queried live, so you need to be online.

Model settings

Difficulty thresholds

Green up to % sustained Blue up to % Black up to % Sustained measured over m

Grooming

Tiller width ft Working speed mph Winch needed above % Machine rate $ /hr Groom nights per season

Clearing

Residual cover, groomer % Residual cover, glade % Felling time min/stem Crew rate $ /hr