10/15/2026
In 1991, BLM completed a land exchange that resulted in public acquisition of nearly 47K acres of private land within the Humboldt and Bruneau River watersheds in northern Nevada. As part of the agreement, numerous livestock exclosures and riparian pastures were created on the new public lands, including roughly 25,000 acres along the Marys River and several tributaries.
The largest of these areas, known as the Marys River Riparian Management Area (RMA), restricted cattle use along approximately 15 mi of the watershed downstream from the Humboldt-Toiyabe National Forest and Jarbidge Wilderness, and along an additional 12 mi of mainstem Marys River north of I-80. While there has been occasional trespass livestock in the RMA, these areas have now been closed to authorized grazing for 35 years.
The result of livestock exclusion has been amazing. The aspen, willow, and cottonwood galleries regrowing along the expanding floodplain have allowed beavers to create lush wetlands and meadows that provide habitat for threatened Lahontan cutthroat trout, amphibians like Columbia spotted frog and northern leopard frog, small mammals like shrews, and diverse pollinators.
These river reaches are designated as an Important Bird Area for the many species of migratory birds that nest there, like warblers, flycatchers, Lewis’s woodpecker, and sandhill crane. River otter and native mussels are also found in the Marys River, and moose that have colonized northern Nevada in recent years find excellent habitat along the dense riparian corridors. Upland seeps and springs are important for sage grouse, pronghorn, and mule deer.
The watershed-scale ecological recovery along the Marys River is a roaring success—something BLM should be striving to replicate across the Great Basin. Instead, it is considering reopening the Marys River to cows.
Read more: https://westernwatersheds.substack.com/p/thirty-five-years-without-cows-transformed