
Craig Mountain dominates the central topography of this Union County region, serving as a massive physical barrier between the Grande Ronde Valley to the northeast and the Clover Creek Valley to the southwest. The mapping highlights a sophisticated water management system vital to this part of Oregon, featuring man-made improvements such as the Grout Ditch, Scott Ditch, and Hot Lake Reservoir. Along the edge of the valley, the small settlement of Union sits near the confluence of Catherine Creek and Pyles Creek, while the thermal features near Hot Lake remain a landmark at the northern foot of the mountain. Local geography is further defined by natural springs including Kaylor Spring and Thompson Spring, and the deep cut of Ladd Canyon, which provides a corridor through the high terrain. The network of rural roads like Hot Lake-Union Road and Ladd Canyon-North Powder Road trace the historical movement between these isolated valley floors.
40 named features on this map. Tap any name to fly to it.
Don’t see what you’re looking for? This feature index may not catch every label — zoom into the map to look around manually.
This is the sole edition of this map. No revisions or reprints were ever made.
1906 · Telocaset
USGS Topo · 1:125,000
1953 · Pendleton
USGS Topo · 1:250,000
1955 · Grangeville
USGS Topo · 1:250,000
1956 · Pendleton
USGS Topo · 1:250,000
1959 · Grangeville
USGS Topo · 1:250,000
1963 · La Grande SE
USGS Topo · 1:24,000
1965 · Conley
USGS Topo · 1:24,000
1965 · Glass Hill
USGS Topo · 1:24,000
1965 · Tucker Flat
USGS Topo · 1:24,000
1965 · Union
USGS Topo · 1:24,000