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Mount Index · 1,826 m · 32 km NNE

Mountain · Cascade Range · Washington

Mount Si

1,270 m4,167 ft

Prominence: 81 m264 ft
Isolation: 0.9 km
Tonight: 33°FPartly cloudy · Wind 0–3 mph E

Mount Si is a 1,270 m (4,167 ft) mountain in the Cascade Range, Washington, United States.

All facts

Elevation: 1,270 m · 4,167 ft
Nearest higher peak: Mount Teneriffe (1,459 m)
Range: Cascade Range
Region: Washington, United States
Protected area: Mount Si Natural Resources Conservation Area
Coordinates: 47.5068° N, 121.7389° W

Open the 3D view

3D map

Mount Si 3D map

Drag to orbit · click, then scroll to zoom (or Ctrl/⌘ + scroll) · One finger scrolls the page · two fingers orbit and zoom · 6 × 6 km

Surface

Vertical scale

Topographic map

Mount Si terrain and contours

50 m contours from the USGS 3DEP 10 m terrain model. Click two points on the map to draw your own cross-section.Tap two points on the map to draw your own cross-section.

Index contours every 250 mShowing west → east through the summit

Mount Si elevation profile

West → east through the summit

Hover the profile to read elevation and distance.Tap or drag along the profile to read elevation and distance.

Weather

Mount Si weather

Today · Fair · 33 / 51°F (1 / 11°C) · 3% chance of precipitation · Wind 1 mph NNW

Mount Si forecast for the summit, about 354 m.

Today33°51°3%1 mph NNW
Sat38°54°37%0–3 mph E
Sun38°56°37%0–6 mph ENE
Mon39°56°25%2 mph ENE
Tue36°54°44%1 mph NW
Wed36°55°31%2 mph ENE
Thu35°57°15%0–3 mph NE

Forecast data: NOAA National Weather Service, public domain, model run Oct 23, 18:26 UTC.

Camping & parking

Camping & parking near Mount Si

Campsites, parking, trailheads and mountain huts mapped in OpenStreetMap around Mount Si, nearest first, by straight-line distance. Check access, fees and permits locally.

Nearest trailhead
Mount Si Trailhead
2.4 km SSE · +2 more within 3.1 km
Directions Map
Nearest parking
Mount Si Trailhead Parking
2.4 km SSE · +2 more within 2.5 km
Directions Map
Nearest campsite
Camp Keller
7.8 km NW
Directions Map

All mapped places 7

Place	Distance
Mount Si TrailheadTrailhead	2.4 km SSE
Mount Si Trailhead ParkingParking	2.4 km SSE
Little Si TrailheadTrailhead	2.5 km SSW
Little Si Trailhead ParkingParking	2.5 km SSW
Little Si Overflow ParkingParking	2.5 km SSW
Mount Teneriffe TrailheadTrailhead	3.1 km SE
Camp KellerCampsite	7.8 km NW

Slope

Share of the 6 × 6 km view by steepness, from the 10 m model.

Mixed terrain: gentle slopes, steep faces and everything between.

Gentle, 0–15°

43.1%

Moderate, 15–30°

22.6%

Steep, 30–45°

27.2%

Cliffs, 45° and over

7.0%

Steeper than 30°: 34.2% of the 36 km² view
Relief in view: 1,290 m low point 124 m

Land cover

ESA WorldCover 10 m classification of the same area.

Trees 89.9%Grassland 7.0%Built-up 1.9%Water 0.9%

Snow & ice means glaciers and year-round snow (a yearly average), not today’s snow cover.

Nearby summits

Named peaks within 3 km, measured from the Mount Si summit.

Summit list 4

1Blowdown Mountain1,400 m 1.3 km NE
2Crater Lake Peak1,326 m 1.5 km NNE
3Little Si462 m 1.6 km SW
4Dixie Peak1,404 m 2.4 km NE

Wildlife

Wildlife seen nearby

Sightings of the most-seen species on iNaturalist (research grade) within 3 km; 566 species recorded in all.

Sightings per species 6

Canada Jay125
Cascade Oregon-grape77
Salal73
Salmonberry70
Pacific trillium67
Western sword fern60

Where it sits

Where Mount Si sits

Nearby

Nearby places

More 1

Lake Serene770 m33 km NNE

Mount Si downloads: topographic map, heightmap, STL 3D model and DEM

Free files made in your browser from this page's terrain data. No sign-up; credit the sources below.

Print & wall

JPGMount Si satellite image (JPEG)Sentinel-2 true-colour image of the same area, taken 2026-08-07.

3D printing & 3D apps

GIS & GPS

</>Embed this mapPaste this into your site to show the interactive 3D terrain, with a credit link back here.

<iframe src="https://topolu.com/embed/mount-si" width="100%" height="480" style="border:0" loading="lazy" allowfullscreen title="3D terrain of Mount Si"></iframe>
<p><a href="https://topolu.com/mount-si" rel="nofollow">Topolu</a></p>

Free to use with credit: see the data sources

Accuracy

How accurate is this?

within 10 m This 3D map reads 1,275 m at the summit; the official height is 1,270 m.

A 10 m terrain model averages each cell, so a few metres either way is normal. The 90 m model misses by 33 m.

Source	Summit	Difference
Official height (Wikidata)	1,270 m	—
USGS 3DEP lidar	1,278 m	+8 m
USGS 3DEP 10 m (used on this page)	1,275 m	+5 m
Copernicus GLO-30	1,241 m	-29 m
Copernicus GLO-90	1,237 m	-33 m

Data sources

Terrain: U.S. Geological Survey, 3D Elevation Program (public domain)
Imagery: Contains modified Copernicus Sentinel data 2026 (scene 2026-08-07)
Land cover: © ESA WorldCover project 2021 / Contains modified Copernicus Sentinel data (2021) processed by ESA WorldCover consortium
Facts: Wikidata (CC0)
Protected area: USGS Gap Analysis Project, PAD-US (public domain)
Wildlife: iNaturalist community observations, counts only
Accuracy comparison: Includes Copernicus WorldDEM-30 © DLR e.V. 2010-2014 and © Airbus Defence and Space GmbH 2014-2018 provided under COPERNICUS by the European Union and ESA; all rights reserved. The European Union, ESA, DLR and Airbus incur no liability for any use of this data and do not endorse this service.
Accuracy comparison, Panorama: Includes Copernicus WorldDEM-90 © DLR e.V. 2010-2014 and © Airbus Defence and Space GmbH 2014-2018 provided under COPERNICUS by the European Union and ESA; all rights reserved. The European Union, ESA, DLR and Airbus incur no liability for any use of this data and do not endorse this service.
Forecast: Weather forecast from NOAA National Weather Service (public domain)
Sources: Wikidata · OpenStreetMap · GeoNames · Wikipedia

Mount Si

West → east through the summit

Nearest trailhead

Nearest parking

Nearest campsite

Data sources