These maps and directions are for planning purposes only. You may find that construction projects, traffic, or other events may cause road conditions to differ from the map results. For travel options, weather and road conditions, visit, call 511 (in Oregon only), 800.977.6368 or 503.588.2941.

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Winding through a variety of high desert habitats, the Diamond Loop Tour Route offers wildlife watching, the historic Round Barn and the fascinating geologic formations of the Diamond Craters.

Along the Marsh

You’ll begin on the Diamond Loop Tour Route by heading east on South Diamond Lane, through the southern section of the Malheur National Wildlife Refuge. An important stopping point along the Pacific Flyway, the refuge Refuge offers a wonderful opportunity for viewing of a variety of bird species from waterfowl and shorebirds to hawks and eagles. Mule deer and antelope also make their home here.

Diamond in the Rough

Diamond is a small ranching community that takes its name from rancher Mace McCoy’s diamond brand. It was established as a major supply center for ranchers, sheepherders, and travelers. Today, all that remains of the town of Diamond is the recently renovated Hotel Diamond, a store and a few residences. East of Diamond, an 11-mile dirt road leads to the Kiger Mustangs Viewing Area. These distinctive wild horses are believed to closely resemble the horses brought to North America by the Spaniards in the late 16th century.

Historic Round Barn

Continuing north, you’ll reach the Pete French Round Barn, built in the late 1870’s or early 1880’s by its namesake. The barn is 100 feet in diameter featuring a 60-foot round stone corral surrounded by a 20-foot wide outer circle paddock with an umbrella-type center truss and centrally supported rafters. Its unusual design was perfectly suited for its purpose: breaking horses during long eastern Oregon winters. The Visitor Center at the site offers exhibits and souvenirs.

Diamond Craters

Driving west on Lava Beds Road, you’ll soon come to Diamond Craters Outstanding Natural Area, home to some of America’s most diverse basaltic volcanic formations. The craters were formed when molten basalt spilled from fissures in the earth and flooded in a thin layer over a dry lake bed. Before the initial layer cooled completely, more basaltic magma injected underneath, creating six arching structural domes. A self-guided tour highlights Lava Pit Crater, Graben Dome and other noteworthy features of the site.

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Round Barn

Drive safely.

Keep in mind many of the routes listed here travel through remote areas where gas stations are few and far between. And since road and weather conditions can be hazardous, even into summer, we urge you to call 800-977-6368 or check Trip Check before starting out.

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  1. Karen says…

    What a great website! Thank you.

    Written on June 13th, 2014 / Flag this Comment

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