mid-snake river access

The public’s cooperation in following mandatory decontamination is crucial to the success of our efforts. The mandatory decontamination zone is critical to minimizing any potential movement of quagga mussels.

Closure Update

While the treatment is implemented, access to the Mid-Snake River will remain open, with temporary closures at the Twin Falls and Shoshone Falls Boat Launches. These closures are intended to allow for ISDA crews to safely and efficiently implement the treatment.

Anticipated closure dates are subject to change:

  • Twin Falls Boat Launch: August 27 – September 6.

  • Shoshone Falls Boat Launch: September 7 – September 13.

The copper-based treatment application rate is lower than the drinking water standard. It is not required by the product label, but out of an abundance of caution, ISDA recommends staying out of the dissipation area (including all livestock and pets) from Hansen Bridge to Highway 46 Bridge from August 27 to September 16.

mandatory decontamination

Inspection and decontamination for watercraft entering and exiting the river between Broken Bridge (Yingst Grade) and Hansen Bridge is mandatory. Any watercraft or conveyance is required to be inspected prior to launch and decontaminated upon exit of the river. The inspection and decontamination stations are operating at Centennial Waterfront Park, Shoshone Falls, and Twin Falls Reservoir.

Call 1-877-336-8676 for more information. 

Watercraft includes but is not limited to boats, kayaks, paddleboards and other devices used in water. Conveyances including duck decoys, waders, fishing tackle, life jackets, and anything that has touched the water must also be decontaminated. ISDA watercraft inspections and decontaminations are free to the public. 

Watercraft launched at any access points between Broken Bridge (Yingst Grade) and Hansen Bridge (i.e. Auger Falls Park, Yingst Grade shoreline access, etc.) must be inspected at Centennial Waterfront Park, Shoshone Falls, or Twin Falls Reservoir prior to launch and decontaminated upon exit of the river. Access to the river between Broken Bridge (Yingst Grade) and Pillar Falls is prohibited outside of Centennial Waterfront Park, Shoshone Falls, and Twin Falls Reservoir operating hours:

Centennial Waterfront Park - 7 a.m. to 10 p.m. *Due to construction, Twin Falls County has temporarily closed Centennial Waterfront Park.

Twin Falls Reservoir - 8 a.m. to 10 p.m.

Shoshone Falls Boat Launch - 2:30 p.m. to 9:30 p.m. Mon. - Fri. and 7:30 a.m. to 9:30 p.m. Sat. - Sun.

*It is strongly encouraged to be off the water at least 30 minutes before park closure time to allow for all watercraft to be decontaminated. 

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