Tucked in the forests east of Island Park, Big Springs is one of Idaho’s natural marvels—where water pours from the earth in staggering volume and crystal clarity. As the headwaters of the North Fork of the Snake River, Big Springs is both a geographic landmark and a place rich in history, ecology, and quiet wonder.

A Natural Wonder
Designated a National Natural Landmark, Big Springs produces over 120 million gallons of water daily, bubbling from aquifers at a constant 52°F (11°C). It’s one of the nation’s largest cold-water springs—so pristine it supports fish, birds, and mammals just steps from its source. Unlike many springs that trickle forth, Big Springs emerges fully formed, gushing from volcanic rock into a wide, clear pool fringed by lodgepole pines. The scene is mesmerizing: blue-green water, rainbow trout drifting in plain sight, and reflections that blur water and sky.

A Vital Headwaters and Native Landmark
Long before European settlers, the Shoshone and Bannock tribes gathered here to hunt and fish. The springs provided fresh water, abundant wildlife, and safe travel routes through what is now Island Park.

The Johnny Sack Cabin
Another highlight is the Johnny Sack Cabin, built by a German immigrant in the 1930s. A skilled carpenter, Johnny created a rustic log home beside the spring, complete with handcrafted furniture and even a small water wheel to generate electricity—long before Island Park had power. Today, the cabin is a beloved landmark open for summer tours, admired for its simplicity and craftsmanship.

Wildlife Sanctuary
The constant flow of cold, clean water supports a thriving ecosystem. Giant rainbow trout gather in the clear waters (no fishing allowed, but feeding is tradition). Moose, muskrat, otters, and bald eagles are often seen, especially at dawn and dusk. A half-mile boardwalk and trail make the springs accessible to families and photographers, with signs highlighting its geology and wildlife.

Big Springs is more than a water source—it’s a source of life, history, and wonder. Whether you’re gazing into its depths, exploring Johnny Sack’s hideaway, or spotting moose in the marsh, a visit is a must during your stay at Blue Buffalo Resort.