Valley images - Joel Sartore

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Wasatch Range and Brigham City, Utah, one of a string of Mormon communities originally settled by handpicked craftsmen, laborers, and school teachers, who arrived in 1847, redirecting mountain streams for farming.

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A rancher on horseback in Idaho’s snow-blanketed Salmon Valley at dusk.

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Two tourist are transfixed by the otherworldly terrain of the Valley of the Moon in Chile’s Atacama desert.

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Hungry Horse Dam, one of the biggest dams that blocks bull trout movements in Northern Montana. Note that biologists say this dam actually prevents non-native fish from moving upstream here, which today is a good thing. No fish ladder or passages were incorporated into this or any other dam in this region at the time they were built.

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A train crosses over a bridge in the Walton area of Glacier National Park, Montana.

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A county road that crosses the Missouri Valley between Peru and Nebraska City, Nebraska.

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A dead fish lies on a rock on Adak Island, Alaska.

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Wild gray wolf (part of the Druid pack) in Yellowstone National Park’s Lamar Valley.

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Sandhill cranes in flight over Merced NWR in California’s central valley.

American avocets (Recurvirostra americana) at Merced National Wildlife Refuge, California.

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American avocets (Recurvirostra americana) at Merced National Wildlife Refuge, California.

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An American avocet at Merced NWR in California’s central valley.

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American coots at San Luis NWR in California’s central valley.

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A close-up of a great blue heron (Andea herodias) in Shark Valley at the north end of Everglades National Park.

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A close-up of a great blue heron (Andea herodias) in Shark Valley at the north end of Everglades National Park.

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Scenic from Shark Valley, on the north end of Everglades National Park.

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Vernal pools like this one in California’s central valley are home to a number of unique species that have carved their niche in these seasonally flooded areas. Development and pollution from agricultural run off threaten the vernal pool habitat.