National Geographic Trails Illustrated map 121 is a waterproof topographic recreation map of the Eagle and Avon area of Colorado at 1:40,680 scale.

What it's for

Use this map to plan hikes, rides, and winter trips around Eagle, Avon, Edwards, Gypsum, and Wolcott. It covers Holy Cross Wilderness, White River National Forest, Beaver Creek Ski Area, the Bocco and Hardscrabble mountains, the Eagle River, Gypsum Ponds State Wildlife Area, and Sylvan Lake State Park.

Features

• Trails: hiking and motorized trails told apart, with road bike, mountain bike, and winter trails marked separately
• Huts: 10th Mountain Division trails and huts
• Recreation info: alpine and cross country ski areas, campgrounds, fishing areas, boat launches, and wildlife viewing sites
• Roads: numbered Forest Service and BLM roads
• Terrain: contour lines, elevations, labeled peaks, summits, and passes, water features, and wooded cover
• Land boundaries: land management boundaries shown
• Paper: printed on Backcountry Tough waterproof, tear resistant paper
• Navigation: full UTM grid printed on the map for use with a GPS

How it works

Reading the scale: at 1:40,680, 1 in on the map is about 0.64 miles on the ground, which leaves room for trail junction mileages and contour detail.

UTM grid: the grid lines let you read a coordinate off the paper map and match it to a GPS unit or phone set to UTM, or plot a GPS position back onto the map.

Specs

• Map number: 121
• Series: National Geographic Trails Illustrated
• Scale: 1:40,680
• Flat size: 22 in x 32 in
• Folded size: 4 in x 7.5 in
• Sides: 2
• Weight: 2 oz
• Copyright date: 2025
• ISBN: 9781566953948
• UPC: 749717009516