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1985 Map of Big Triangle, 1986 Print
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1985 Map of Big Triangle

USGS Topo · Published 1986

About this map

The Colorado River carves a deep path through the high desert of Grand County in this mid-1980s survey. This specific stretch is defined by technical whitewater and precarious navigation, featuring the notable Skull Rapids, Sock-It-To-Me Rapids, and Last Chance Rapids within Westwater Canyon. These features indicate the challenging nature of the river corridor before it opens toward Cisco Landing in the northwest. Away from the river, the landscape transitions into high mesas and complex drainage systems like Dry Gulch and Coates Creek. The map documents a rugged interior accessible largely by 4WD trails, where landmarks like Big Triangle and the expansive Sand Flat dominate the topography. Evidence of human activity is sparse but specific, noted by a Gravel Pit and a remote Prospect near the canyon rims, illustrating the minimal but present industrial footprint in this canyonlands environment.

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Map Details

Date Portrayed1985
Date Published1986
PublisherU.S. Geological Survey
Map TypeTopographic
Scale1:24000
Physical Dimensions21.8 x 26.8 inches

Editions of this 1985 Big Triangle Map

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Source Details

SourceU.S. Geological Survey
CopyrightPublic Domain