Northern Central Colorado, Sheet VI, Geological and Geographical Atlas of Colorado (Hayden, 1877)
Sheet VI of F. V. Hayden’s Geological and Geographical Atlas of Colorado (U.S. Geological and Geographical Survey of the Territories, 1877), surveyed 1873–76: North Park, Middle Park and the Front Range from Longs Peak to the South Park, Denver, Boulder and the plains, with the Indian Trail up the North Platte in North Park toward Willow Creek Pass and contours every 200 feet.
Source
| Map | Geological and geographical atlas of Colorado and portions of adjacent territory, LOC gs08000146-8 |
|---|---|
| Author | F. V. Hayden (G. R. Bechler, S. B. Ladd and H. Gannett, topographers), 1877 |
| Archive | Wikimedia Commons |
| Rights | Public domain. Published 1877 — before 1931, so public domain in the United States. Evidence |
| Accuracy | About 3 km. Placed by hand in a map-queue session and approved by a person. If something sits in the wrong place, members can fix it with Fix placement on the map. |
| Method | Placed by hand on the sheet’s own graticule: a polyconic fit to 17 crossings of its 15′ meridians and parallels read off the scan (0.27 km RMS), checked against Longs Peak (0.3 km) and Boulder (1.4 km); 66 crossings. See the methodology. |
| Version | 1.0.0, updated 2026-10-12 |
| Covers | Colorado |
Downloads
- Google Earth overlay (KMZ) — free (10.1 MB)
- GeoTIFF, tinted trails, EPSG:4326 (6000 × 3146; QGIS, ArcGIS) — free (24.6 MB)
- Print sheet over today’s map (3600 × 2200 PNG) — free (5.5 MB)
Project Homeland
This map is open for tracing into Project Homeland, one map of the trail network melded from every traced source. Members trace a trail by clicking along it: Trace a trail on the map.
Changelog
- 1.0.0 (2026-10-12): First release: placed by hand at 66 places. From the Library of Congress (gs08000146) via Wikimedia Commons; added for Project Homeland.
Credits
- From the Library of Congress (gs08000146) via Wikimedia Commons; added for Project Homeland
- Georeferencing: Native Routes
- Scan: Wikimedia Commons
Control points
The full list of control points with residuals is in control-points.geojson. Historic names indexed for search: names.geojson.
Something on this map sits in the wrong place? Members can show where with Fix placement on the map — confirmed fixes are tested against the map’s other control points each night and credited here. For anything else, report a problem.
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