Thompson Flat, OR Forest Service Topo Map (FSTopo)
by Forest Service FSTopo Quads (public domain), US
A free GeoPDF for offline GPS in the Cartahaven app, with free updates. How it works offline

About the Thompson Flat quad
The Thompson Flat quadrangle is a Forest Service FSTopo 7.5-minute map at 1:24,000 covering about 7.7 × 9.9 mi of Morrow County, Oregon. It overlaps Umatilla National Forest. The GeoPDF is 2.6 MB.
All Oregon Forest Service FSTopo maps · Oregon hunting units
What you get
- Your GPS position on the map. A blue dot on this official sheet shows where you are.
- Works with no signal. Download it once; the map and your GPS position keep working with no cell signal.
- Tracks, placemarks and photos. Record where you go, drop pins, and export GPX, KML or GeoJSON.
- Free updates. When a new edition is published here, it’s yours at no cost.
- 1Tap “Get this map”: it’s added to your free account.
- 2Open the Cartahaven app on your phone and sign in.
- 3Tap “Get my maps”. It’s on your phone, ready offline.
The app runs on iPhone, Android and in desktop browsers. Install it · How offline GPS works
Where this map covers
Named places on this map
13 named features inside the Thompson Flat — Forest Service FSTopo 7.5-minute quad sheet, from the USGS Geographic Names Information System. Each one links to every map that shows it.
Peaks and ridges
- Devils Backbone · ridge
- Potamus Ridge · ridge
- Zion Scope · ridge
Lakes, springs and falls
- Bonita Spring · spring
- Brush Spring · spring
- Gopher Spring · spring
- Hunter Spring · spring
- Matlock Waterhole · lake
- Thompson Falls · falls
- Thompson Falls Spring · spring
- West Gopher Pond · lake
Gaps, arches and other landforms
- Potamus Point · cliff
- Thompson Flat · flat
Elevations are the USGS 3DEP ground elevation at the named point, rounded; a summit's surveyed height can differ a little.
More maps of Umatilla National Forest.
Maps nearby
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Thompson Flat, OR
Detailed map of terrain, trails and roads
USGS topo, 2024

Map 5 Motor Vehicle Use Map (MVUM)
Forest roads and trails open to vehicles
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Map 4 Motor Vehicle Use Map (MVUM)
Forest roads and trails open to vehicles
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Entire District Motor Vehicle Use Map (MVUM)
Forest roads and trails open to vehicles
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Heppner 30x60 Land Ownership (BLM Surface Management)
Land Ownership Maps from BLM Data · Oregon

Umatilla National Forest
West — Forest Service forest map
Version history
Version 1 · Nov 8, 2026 · 2.6 MB