2023 Map of Castle Rock

About this map

Castle Rock dominates this high-desert landscape in Eastern Oregon, marking a point where the boundaries of Grant, Malheur, and Harney counties converge. The drainage of the Little Malheur River carves through the western portion of the sheet, while to the east, the headwaters of South Bully Creek and Bendire Creek begin their descent. This area is defined by a complex network of springs and canyons, such as Jerry Canyon and Whisky Gulch, which supported historical ranching and land use across Horse Flat. Early transportation routes like Castle Rock Rd and Lost Creek Rd follow the natural contours of the terrain, connecting isolated water sources like Horse Flat Reservoir and Mouse Lake. The map reveals the persistence of named water features in an arid environment, including Irish Spring and Castle Rock Spring.