Loading map...

2017 Map of Casto

Name: 2017 Topographic Map of Casto
Creator: U.S. Geological Survey
Published: 2017
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2017

About this map

Challis National Forest dominates this mountainous landscape in Custer County, defined by the deep drainage basins of Loon Cr and Mayfield Cr. The small settlement of Casto sits near the confluence of several mountain streams, serving as a focal point in a territory otherwise characterized by high-elevation ridges and narrow valleys. This 2017 survey shows a remote backcountry network of trails and primitive roads, including the Loon Creek Rd and the Knapp-Loon Creek route, which provide access to interior landmarks like Horse Ladder.

Air access is represented by the Upper Loon Creek USFS Airport, highlighting the logistical challenges of managing this wilderness. The map details the intricate hydrography of the Salmon River mountains, from the E-Fork Mayfield Cr to smaller tributaries like Tincup Cr and Shell Cr. These watercourses have long dictated travel and land use in this part of Idaho, tracing the same paths used by early explorers and forest rangers.