National Park Service

Sierra Nevada Network (SIEN)

Sierra Nevada Network

Weather station at Devils Postpile NM Devils Postpile National Monument Glacial polish on top of Devils Postpile columnar basalt formation Paintbrush flowers at Devils Postpile NM Black bear in the river at Sequoia & Kings Canyon Bullock's Oriole, Sequoia & Kings Canyon Davis Lake, Kings Canyon National Park Foxtail pine,  Sequoia National Park Moro Rock at Sequoia & Kings Canyon Pika at Sequoia & Kings Canyon Giant sequoia trees at Sequoia & Kings Canyon Giant sequoia trees at Sequoia & Kings Canyon Yellow-legged frog Deer in a meadow at Yosemite NP Yosemite Falls Great gray owl at Yosemite National Park Hydrologist working at Yosemite National Park Scientists studying lichens at Yosemite National Park Half Dome and Merced River, Yosemite National Park Tenaya Lake, Yosemite National Park

The Sierra Nevada Network Inventory & Monitoring Program is one of 32 National Park Service Inventory & Monitoring (I&M) networks across the country established to facilitate collaboration, information sharing, and economies of scale in natural resource monitoring. The Sierra Nevada Network (SIEN) comprises four national park units located on the west slope of the Sierra Nevada mountain range in California.

These parks have a striking elevation gradient, from 1,370 feet (418 meters) in the foothills to 14,494 feet (4,421 meters) at the top of Mount Whitney, the highest peak in the lower 48 states. This elevation gradient and topographic variability result in a high diversity of plants and animals.

SIEN works closely with each park's natural resources program to develop and implement long-term monitoring and provide sound scientific information to park managers. Learn more about specific topics by exploring the links on the left or visit the park units pages to discover the particular resources found at each of these special places.


Featured Information

Seeking Clarity: Tracking Change in Mountain Lakes

Yosemite National Park Webcams
(click on image for a larger view)

Click here to see a complete list of live webcams at Yosemite National Park.

Yosemite Falls Webcam Half Dome Webcam Yosemite High Sierra Webcam Turtleback Dome Webcam

Webcams at
Sequoia & Kings Canyon National Parks
(click on image for a larger view)

Click here to see a complete list of live webcams at Sequoia and Kings Canyon National Parks.

Giant Forest Webcam California Buckeye Webcam Foothills Blue Oak Webcam

Current Newsletter

SIEN Newsletter (December 2017)

Includes articles about the challenges of large snowpack, high waters, and fire for field crews; a winter birding event at Cesar E. Chavez National Monument; moving beyond protocol development; managing for resilience in Devils Postpile National Monument; detecting rare aquatic animals with eDNA in Yosemite National Park; field project news; and more...

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Last Updated: January 05, 2018 Contact Webmaster