Idaho Avalanche Danger Report Interactive Map

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"Where's the danger?" Here are autogenerated DEM Shading rules for each advisory zone that allow for quickly adding avalanche danger and problem layers to CalTopo maps.

Show Instructions

Digital Elevation Model (DEM) shading let's you create custom shading schemes based on elevation, slope, aspect and tree cover.

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Avalanche Report

The selected elevation bands are not meant to be exact, but represent a characteristic of the terrain which varies locally.

The highest band, ATL (Above Tree Line), typically includes alpine areas beginning as the treeline transitions into open slopes extending to ridges and peaks.

The middle band, NTL (Near Tree Line), is typically a narrow transition zone between dense forests and treeless alpine areas.

The lowest band, BTL (Below Tree Line), typically extends from valley floors or snowline to near treeline.

Adjusting bands

The default elevation bands may not be accurate for the current zone, you can adjust the bands by dragging the sliders.

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Usage

You'll find that Terrain Modeling in the left pane will show layers that can be turned on and edited. The right pane will show Custom Layers that can be toggled on or off.

Select A Zone: Selkirk Mountains Silver Valley & Bitterroot Mountains West Cabinet Mountains Salmon River Mountains West Mountains Banner Summit Galena Summit & Eastern Mtns Sawtooth & Western Smoky Mtns Soldier & Wood River Valley Mtns

Avalanche Report

Pre-populated CalTopo Map

2026-02-26 Avalanche Danger

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• High danger (above 7501')
• High danger (6501' to 7500')
• Considerable danger (below 6500')

2026-02-25 Persistent Slab

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• All aspects (above 7501')
• All aspects (6501' to 7500')
• W to E aspects (below 6500')

2026-02-25 Storm Slab

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• All aspects (above 7501')
• All aspects (6501' to 7500')

Issued at: Tuesday, February 24, 2026 6:00AM
Issued by: IPAC

Avalanche Report

Pre-populated CalTopo Map

2026-02-26 Avalanche Danger

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• High danger (above 7501')
• High danger (6501' to 7500')
• Considerable danger (below 6500')

2026-02-25 Persistent Slab

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• All aspects (above 7501')
• All aspects (6501' to 7500')
• W to E aspects (below 6500')

2026-02-25 Storm Slab

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• All aspects (above 7501')
• All aspects (6501' to 7500')

Issued at: Tuesday, February 24, 2026 6:00AM
Issued by: IPAC

Avalanche Report

Pre-populated CalTopo Map

2026-02-26 Avalanche Danger

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• High danger (above 7501')
• High danger (6501' to 7500')
• Considerable danger (below 6500')

2026-02-25 Persistent Slab

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• All aspects (above 7501')
• All aspects (6501' to 7500')
• W to E aspects (below 6500')

2026-02-25 Storm Slab

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• All aspects (above 7501')
• All aspects (6501' to 7500')

Issued at: Tuesday, February 24, 2026 6:00AM
Issued by: IPAC

Avalanche Report

Pre-populated CalTopo Map

2026-02-26 Avalanche Danger

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• High danger (above 7501')
• Considerable danger (6501' to 7500')
• Considerable danger (below 6500')

2026-02-26 Wind Slab

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• All aspects (above 7501')
• All aspects (6501' to 7500')

2026-02-26 Persistent Slab

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• W to SE aspects (above 7501')
• W to SE aspects (6501' to 7500')

Issued at: Wednesday, February 25, 2026 7:07AM
Issued by: PAC

Avalanche Report

Pre-populated CalTopo Map

2026-02-26 Avalanche Danger

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• High danger (above 7501')
• Considerable danger (6501' to 7500')
• Considerable danger (below 6500')

2026-02-26 Wind Slab

Copy to clipboard

• All aspects (above 7501')
• All aspects (6501' to 7500')

2026-02-26 Persistent Slab

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• W to SE aspects (above 7501')
• W to SE aspects (6501' to 7500')

Issued at: Wednesday, February 25, 2026 7:07AM
Issued by: PAC

Avalanche Report

Pre-populated CalTopo Map

2026-02-26 Avalanche Danger

Copy to clipboard

• Considerable danger (above 7501')
• Considerable danger (6501' to 7500')
• Moderate danger (below 6500')

2026-02-26 Persistent Slab

Copy to clipboard

• W to SE aspects (above 7501')
• W to SE aspects (6501' to 7500')

2026-02-26 Wind Slab

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• All aspects (above 7501')

Issued at: Wednesday, February 25, 2026 6:59AM
Issued by: SNFAC

Avalanche Report

Pre-populated CalTopo Map

2026-02-26 Avalanche Danger

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• High danger (above 7501')
• Considerable danger (6501' to 7500')
• Moderate danger (below 6500')

2026-02-26 Persistent Slab

Copy to clipboard

• W to SE aspects (above 7501')
• W to SE aspects (6501' to 7500')

2026-02-26 Wind Slab

Copy to clipboard

• All aspects (above 7501')

Issued at: Wednesday, February 25, 2026 6:59AM
Issued by: SNFAC

Avalanche Report

Pre-populated CalTopo Map

2026-02-26 Avalanche Danger

Copy to clipboard

• High danger (above 7501')
• Considerable danger (6501' to 7500')
• Considerable danger (below 6500')

2026-02-26 Persistent Slab

Copy to clipboard

• W to SE aspects (above 7501')
• W to SE aspects (6501' to 7500')

2026-02-26 Wind Slab

Copy to clipboard

• All aspects (above 7501')

Issued at: Wednesday, February 25, 2026 6:59AM
Issued by: SNFAC

Avalanche Report

Pre-populated CalTopo Map

2026-02-26 Avalanche Danger

Copy to clipboard

• Considerable danger (above 7501')
• Considerable danger (6501' to 7500')
• Moderate danger (below 6500')

2026-02-26 Persistent Slab

Copy to clipboard

• W to SE aspects (above 7501')
• W to SE aspects (6501' to 7500')

2026-02-26 Wind Slab

Copy to clipboard

• All aspects (above 7501')

Issued at: Wednesday, February 25, 2026 6:59AM
Issued by: SNFAC

Zone

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