Note: The information presented below was researched by Madison Leeman, J.D. Candidate 2025 from the University of Idaho College of Law. Madison completed a Summer 2024 externship with the Henry’s Fork Foundation.
Idaho law requires the owner of any boat or non-motorized vessel to buy and display an Idaho Invasive Species Fund sticker to legally launch and operate the vessel within the state of Idaho. This requirement includes motorboats, jet boats, canoes, kayaks, rafts, and drift boats. Inflatable, non-motorized vessels less than 10-ft in length are exempt. These laws apply to resident and non-resident boaters. Non-compliance could result in penalties listed in I.C. § 67-7033.
You can purchase Invasive Species Fund stickers online, at any Idaho State Park, and at select retail locations. More information available at: https://invasivespecies.idaho.gov/invasive-species-sticker-faqs
The Invasive Species Fund is managed by the Idaho Dept. of Agriculture. The Invasive Species Fund stickers are administered by the Idaho Dept. of Parks and Recreation. Invasive Species Fund sticker compliance is enforced by county law enforcement officers.
Idaho residents are required to register boats in Idaho within 15 days of purchase. Water vessels with a motor of any kind and any vessel that is being financed must be titled with a registration number. Titling is optional for vessels acquired before January 1, 2000. Vessels that are not powered by motor and cannot be titled are exempt. These include rowboats, canoes, kayaks, drift boats, rafts, sailboats, inflatables, and others.
Boat registration from other states is valid in Idaho for 60 consecutive days. Out-of-state boaters are required to purchase an Invasive Species Fund sticker and all boaters entering Idaho and passing a boat inspection station must stop for inspection.
Boat registration is outlined in the Idaho Safe Boating Act (Title 67 Chapter 70). Compliance is enforced by county sheriffs and any other law enforcement officer within Idaho, such as state or national park officers within their parks of jurisdiction.
In the Henry’s Fork region, there are 8 river and lake sections that outfitters have licenses to operate on. Each river section is further separated into individual river reaches. For the Henry’s Fork alone, there are three river sections. They are licensed as follows:
Commercial fishing guides and outfitter licenses are regulated by the Idaho Outfitters and Guides Licensing Board.
In Fremont County, river access sites have various jurisdictions—including the U.S. Forest Service, Fremont County, and Harriman State Park. In terms of river use, the Safe Boating Act provides authority to local counties to regulate waterways within their territorial limits (I.C. § 67-7031). Counties in Idaho can regulate those launching on their waterways through ordinances and county code.
For example, Franklin County Code § 93.02 restricts all types of watercrafts and fishing from Winder Reservoir. In Bonneville County, Ordinance No. 240-21 sets no wake zones on its waterways and two of its main reservoirs. In Teton County, Code Title 14 limits group size, requires parking passes for river-adjacent parking lots, and controls commercial watercraft rental companies via permitting. In Fremont County, Ordinance 2011 created restricted geographic zones that limit or entirely ban motorized watercraft.
Our Aquatic Ecology Program Manager, Dr. Jack McLaren, joined Idaho Falls city and FIPS-Mouche leadership at the opening ceremony parade along the Snake River Greenbelt to welcome competitors to the watershed and to make sure conservation was front and center.
Drone photo of Island Park Dam taken on September 9, 2026 Looking Back on September September brought lows and highs to Island Park. Island Park Reservoir started September at 29% full and quickly fell to a low of 12% full on September 19. The rapid drawdown of the reservoir was the result of managers needing to move water downstream to American Falls (to irrigate farms in the Magic Valley with senior water rights). Such low
This story was written by Audrey Hunter (2026 intern) and was originally published in the Fall 2026 Newsletter. It’s no secret that late summers on Island Park Reservoir haven’t been in perfect conditions in recent years. Warm, turbid, algae-filled water plague reservoir recreationists while diminishing water quality downstream. Cyclical algal blooms decrease water clarity and create less-than-ideal circumstances for the reservoir’s flora and fauna. What’s the solution? HFF’s DIRTT Plan. In-Reservoir Oxygenation Nutrients released from
Drone photo taken on September 9, 2026 The Henry’s Fork Drought Management Planning Committee met on Wednesday, September 16 2026 to develop an updated reservoir management strategy. Downstream of the Henry’s Fork watershed, lower-valley irrigation demand over the rest of the season is anticipated to be slightly lower than projected last week, so Island Park Reservoir and Grassy Lake (in the Fall River drainage) do not need to deliver any more water out of the
