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1969 Map of Grape Mtn

Name: 1969 Topographic Map of Grape Mtn
Creator: U.S. Geological Survey
Published: 1971
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1971

About this map

The South Fork Boise River winds through the central corridor of this Boise National Forest landscape, feeding into the expansive waters of the Arrowrock Reservoir. This 1969 field-checked survey reveals a rugged backcountry defined by numerous drainage systems, including Deadman Creek and Lime Creek, that carve through the high-elevation terrain around Grape Mtn. Transportation through this steep canyon country is limited, centered primarily on the winding path of Blacks Creek Road and several unimproved tracks that navigate the ridges.

Evidence of early 20th-century water management is clear at the reservoir, where the normal pool elevation is documented at 3,216 feet. Recreational infrastructure is sparse but present at the Irish Creek Boat Ramp. Local history enthusiasts can trace the old boundary line between Boise and Elmore counties as it zigzags through the water and across named landmarks like Pury Flat and the prominent Rock Pinnacle.