Irvin Thompson Mountain
mountain · Ketchikan Gateway · GNIS 1422774
Dataset / verified: gnis-ak-2026-07-18 · ID afy:place:gnis:1422774
Summit in Alaska (USGS GNIS). County equivalent: Ketchikan Gateway. Map: Ketchikan B-6 SE.
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This summit or range feature is listed in USGS GNIS under the Ketchikan Gateway label. Elevations and names can be revised with newer surveys—verify access, climbing restrictions, and aviation hazards with land managers and charts before trips.
Irvin Thompson Mountain is indexed for search, maps, and cross-links across the ALASKA.FYI gazetteer. GNIS does not replace avalanche forecasts, climbing permits, or flight planning—use authoritative weather, NOTAMs, and local guidance for the window you travel.
ALASKA.FYI keeps terrain pages structured like communities and water bodies: same blocks, same outbound posture. Start here, then follow agency sources for closures, routes, and rescue expectations.
Practical notes
Weather windows, visibility, and avalanche hazard can change hourly. Check NWS point forecasts, avalanche centers where applicable, and land-manager notices. Carry communication and turnaround criteria appropriate to remote terrain.
Sources
- U.S. Geological Survey / U.S. Board on Geographic Names — GNIS Domestic Names (Alaska) · View source
Summaries are compiled from public sources; verify fees, closures, and regulations with the managing agency. ALASKA.FYI does not provide legal advice.
55.3517418, -131.7829795 · WGS84
Map
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55.3517418, -131.7829795 · WGS84 · zoom 12
Quick facts
- Region / county equivalent
- Ketchikan Gateway
- Coordinates
- 55.3517418, -131.7829795
- Elevation
- 2329 ft · 710 m
- Jurisdiction
- Ketchikan Gateway Borough →
- Latitude
- 55.3517418
- Longitude
- -131.7829795
WGS84 (EPSG:4326)
GNIS elevation from National Elevation Dataset sampling at the primary point; not an official surveyed summit height.
Source: gnis-ned-archive
GNIS ID 1422774 · Names and coordinates from USGS Geographic Names Information System (GNIS) / U.S. Board on Geographic Names, public domain. Elevations (when present) are GNIS/NED-derived values for general reference — not official surveyed heights. Alternate names retain GNIS citations. Not legal boundary or navigation advice.
Official links
Authoritative agency pages for this record. alaska.fyi indexes names and coordinates; verify conditions and regulations with the source agency.
- National Weather Service · NWS point forecast
- U.S. Geological Survey · USGS GNIS feature 1422774
- U.S. Geological Survey · USGS topo: Ketchikan B-6 SE
- Ketchikan Gateway Borough · Jurisdiction: Ketchikan Gateway Borough
- Alaska DOT&PF · Road conditions (511 Alaska)
- Alaska DOT&PF · Alaska DOT&PF
- Alaska DOT&PF · Alaska DOT&PF — Southcoast Region
- Alaska Department of Natural Resources · Alaska DNR — Open Data
- Alaska Department of Natural Resources · Alaska DNR Mapper (land status)
Sources
-
U.S. Geological Survey / U.S. Board on Geographic Names — GNIS Domestic Names (Alaska)
· Public domain (US federal)
See also Sources and Methodology.