Arizona

Agua Fria National Monument
The Agua Fria National Monument contains one of the most significant systems of late prehistoric sites in the American Southwest. Between A.D. 1250 and 1450, the region’s pueblo communities were populated by as many as several thousand people. Agua Fria comprises approximately 71,000 acres and was established in January 2000 by Presidential Proclamation. The monument contains one of the most significant systems of late prehistoric sites in the American Southwest. Its ancient ruins offer insights into the lives of those who long ago inhabited this part of the desert southwest. Between A.D. 1250 and 1450, the area's pueblo communities were populated by up to several thousand people. At least 450 prehistoric sites are known to exist within the monument area and there are likely many more.

Grand Canyon-Parashant National Monument
The Grand Canyon-Parashant National Monument is a vast, biologically diverse landscape encompassing an array of scientific and historic objects which has a rich human history spanning more than 11,000 years and an equally rich geologic history of almost 2 billion years. The BLM and National Park Service jointly manage the more than one million acres within the monument’s boundaries as established in January 2000 by Presidential Proclamation.  The monument contains valuable geological resources, including relatively undeformed and unobscured Paleozoic and Mesozoic sedimentary rock layers and abundant fossils, offering a clear view to understanding the geologic history of the Colorado Plateau.  The monument also contains outstanding biological resources including giant Mojave yucca, trophy-quality mule deer, the California condor, desert tortoise, and southwestern willow flycatcher.

Ironwood Forest National Monument
The Ironwood Forest National Monument offers quintessential views of the Sonoran Desert’s ancient legume and cactus forests. Ironwood is the dominant nurse plant in this region, and the Silver Bell Mountains support the highest density of ironwood trees in the Sonoran Desert. The monument was established in June 2000 by Presidential Proclamation to encompass nearly 130,000 acres. Ironwood trees provide, among other things, roosting sites for hawks and owls, forage for desert bighorn sheep, protection for saguaro against freezing, burrows for tortoises, flowers for native bees, dense canopy for nesting of white-winged doves and other birds, and protection against sunburn for night blooming cereus.

Sonoran Desert National Monument
This monument is a magnificent example of untrammeled desert landscape, presenting an extraordinary array of biological, scientific, and historic resources within a functioning desert ecosystem. Encompassing nearly 500,000 acres, the monument was established in January 2001 by Presidential Proclamation. The monument’s diverse plant communities, including striking saguaro cactus forests, support a wide variety of wildlife, such as desert bighorn sheep, mountain lions, the Sonoran desert tortoise and over 200 species of birds.

Vermillion Cliffs National Monument
Despite its arid climate and rugged isolation, Vermilion Cliffs National Monument is the setting for a wide variety of biological objects and a long and rich human history. The Cliffs rise 3,000 feet above the southern edge of the Paria Plateau to form a spectacular sandstone-capped escarpment underlain by multicolored, actively eroding, dissected layers of shale and sandstone. The monument encompasses nearly 300,000 acres and was established in November 2000 by Presidential Proclamation. Despite sporadic rainfall and widely scattered ephemeral water sources, the monument supports a variety of wildlife species. At least twenty species of raptors have been documented in the monument, as well as a variety of reptiles and amphibians. California Condors have been reintroduced into the monument in an effort to establish another wild population of this highly endangered species.

California

California Coastal National Monument
The California Coastal National Monument is a biological treasure. Its thousands of islands, rocks, exposed reefs, and pinnacles are part of the nearshore ocean zone, which begins just off shore and ends at the boundary between the continental shelf and continental slope. Presidential Proclamation established the monument in January of 2000. The monument provides feeding and nesting habitat for an estimated 200,000 breeding seabirds as well as  forage and breeding habitat for marine mammals including the southern sea otters and California sea lions.

Carizo Plain National Monument
Full of natural splendor and rich in human history, the grasslands and stark ridges of the Carrizo Plain National Monument contain exceptional objects of scientific and historic interest. Bisected by the San Andreas Fault zone, the Carrizo Plain National Monument is the largest undeveloped remnant of this ecosystem, providing crucial habitat for long-term conservation of the many endemic plant and animal species that still inhabit the area. Encompassing more than 200,000 acres, the monument was established in January 2001 by Presidential Proclamation. The monument is also a premier example of the San Andreas Fault system, including. stream channels that suddenly shift up to one-half mile north as they cross the fault line, and fault-trimmed ridges which rise sharply from plain to form the Panorama and Elkhorn Hills. The monument is also home to the largest concentration of endangered species in all of California, in part because the remote 45-mile-long plain is an ecological "island," the single largest remaining remnant of native grassland in California that was once abundant in the southern San Joaquin Valley.

Santa Rosa and San Jacinto Mountians National Monument
Santa Rosa and San Jacinto Mountains of southern California contain nationally significant biological, cultural, recreational, geological, educational and scientific resources. The vistas, wildlife, land forms, and natural and cultural resources of these mountains provide a counterpoint to the highly urbanized areas of the nearby Coachella Valley. The Santa Rosa and San Jacinto Mountains National Monument Act established the unit in October 2000.

Colorado

Canyons of the Ancients National Monument
Containing the highest known density of archaeological sites in the nation, Canyons of the Ancients National Monument holds evidence of cultures and traditions spanning thousands of years. The monument’s complex landscape and remarkable cultural resources offers unparalleled opportunities to study and experience how cultures in the American Southwest lived and adapted over time. Presidential Proclamation established the monument in June 2000.

Idaho

Craters of the Moon National Monument
Craters of the Moon National Monument was established on
May 2, 1924, to protect the unusual landscape of the Craters of the Moon lava field. The scientific value of the monument lies in the great diversity of volcanic features preserved within a relatively small area. The Proclamation in 2000 expanded the monument to its current size of approximately 661,000 acres, which are managed jointly by the BLM and the National Park Service. The monument’s central focus is the Great Rift, a 62-mile long crack in the earth's crust. The Great Rift is the source of a remarkably preserved volcanic landscape with an array of exceptional features. Craters, cinder cones, lava tubes, deep cracks, and vast lava fields form a strangely beautiful volcanic sea on central Idaho's Snake River Plain.

Montana

Pompeys Pillar National Monument
Pompeys Pillar is a massive sandstone outcrop on the banks of the Yellowstone River, at a natural ford in the Yellowstone River which has made it a celebrated landmark and outstanding observation point for the more than 11,000 years that humans have occupied the area. The monument’s most notable visitor, Captain William Clark of the Lewis and Clark Expedition, stopped at Pompeys Pillar on July 25, 1806, while returning from the Pacific coast. The 51-acre site was declared a monument by Presidential Proclamation in January 2001.

Upper Missouri River National Monument
The cliffs along this 149-mile stretch of the Missouri River remain virtually the same as when Lewis & Clark traveled through the area 200 years ago. The Lewis & Clark National Historic Trail and the Nez Perce National Historic Trail run through the monument. Presidential Proclamation established the 370,000-acre monument in January 2001. The monument is covered with sedimentary rocks deposited in shallow seas that covered central and eastern Montana during the Cretaceous period. Glaciers, volcanic activity, and erosion have since folded, faulted, uplifted, and sculpted the landscape to the majestic form it takes today.

New Mexico

Kasha-Katuwe Tent Rocks National Monument
Located in north-central New Mexico, the Kasha-Katuwe Tent Rocks National Monument is a outdoor laboratory that offers an opportunity to observe geologic processes as well as cultural and biological objects of interest. Cone-shaped tent rock formations are the products of explosive volcanic eruptions that occurred between 6 and 7 million years ago. The monument encompasses approximately 4,000 acres and was established in January 2001 by Presidential Proclamation.

Oregon

Cascade-Siskiyou National Monument
Fir forests, oak groves, wildflower meadows, and steep canyons make the Cascade-Siskiyou National Monument an ecological wonder, with biological diversity unmatched in the Cascade Range. Approximately 52,000 acres comprise the monument, which was established in June 2000 by Presidential Proclamation. A tremendous variety of plants and animals make homes amidst the towering forests, sunlit groves, wildflower-strewn meadows, and steep canyons. The Monument is also a bird haven, with more than 200 species identified, including the Northern Spotted Owl, the Great Gray Owl, the Peregrine Falcon and the Willow Flycatcher.

Utah