Picture Rock Pass is a mountain pass

Mountain pass

A mountain pass is a route through a mountain range or over a ridge. If following the lowest possible route, a pass is locally the highest point on that route...

 in Oregon

Oregon

Oregon is a state in the Pacific Northwest region of the United States. It is located on the Pacific coast, with Washington to the north, California to the south, Nevada on the southeast and Idaho to the east. The Columbia and Snake rivers delineate much of Oregon's northern and eastern...

 traversed by Oregon Route 31. It is located between the communities of Silver Lake

Silver Lake, Oregon

Silver Lake is an unincorporated community in Lake County, Oregon, United States. It is located on Oregon Route 31. Facilities include a gas station and a small store. It is also the location of North Lake School, "Home of the Cowboys".- History :...

 and Paisley

Paisley, Oregon

Paisley is a city in Lake County, Oregon, United States. It is located along Oregon Route 31, between Summer Lake and Lake Abert. The population was 247 at the 2000 census.-History:...

 in Lake County

Lake County, Oregon

Lake County is a county in the high desert south central region of the U.S. state of Oregon, so named for the many lakes found within its boundaries, including Lake Abert, Hart Lake Reservoir, and Goose Lake. While Lake is among Oregon's largest counties, it is sparsely populated with 7,895...

. Geographically, it separates Silver

Silver Lake (Oregon)

Silver Lake is a lake in Lake County, Oregon, United States. It is east of the community of Silver Lake. It is unknown who first gave the lake its descriptive name. Central Oregon residents attribute it to John C. Frémont, although no proof has been found, and he would not have seen the lake on...

 and Summer

Summer Lake (Oregon)

Summer Lake is a large, shallow, alkali lake in Lake County, Oregon, United States. It is approximately long and wide, and is located five miles south of the small, unincorporated community of Summer Lake, Oregon. The lake was named by explorer John C. Fremont on his expedition into Central...

 lakes. These two lakes with their related drainage basin

Drainage basin

A drainage basin is an extent or an area of land where surface water from rain and melting snow or ice converges to a single point, usually the exit of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean...

s are the most northwesterly part of the Great Basin

Great Basin

The Great Basin is the largest area of contiguous endorheic watersheds in North America and is noted for its arid conditions and Basin and Range topography that varies from the North American low point at Badwater Basin to the highest point of the contiguous United States, less than away at the...

.

The name of the pass comes from some pictogram

Pictogram

A pictograph, also called pictogram or pictogramme is an ideogram that conveys its meaning through its pictorial resemblance to a physical object. Pictographs are often used in writing and graphic systems in which the characters are to considerable extent pictorial in appearance.Pictography is a...

s on rocks south of the highway which are not presently understood.