No. 17-949October Term 2018Decided Mar 26, 2019
Sturgeon v. Frost
Inside Alaska park boundaries, nonfederal waters are not automatically subject to the Park Service's usual federal-park rules.
Case status
- Current stage
- Decided
- Latest event
- Decision released Mar 26, 2019
- What it's about
John Sturgeon challenged the National Park Service’s ban on using his hovercraft on Alaska’s Nation River, which runs through a national preserve but is not federally owned. The case is about whether ANILCA lets the Park Service regulate nonfederal lands and waters inside Alaska park boundaries the same way it regulates federal park land.
Question presented
Whether the Alaska National Interest Lands Conservation Act prohibits the National Park Service from exercising regulatory control over State, Native Corporation, and private land physically located within the boundaries of the National Park System in Alaska.
- Case path
United States Court of Appeals for the Ninth Circuit / Decision released Mar 26, 2019
- Area
Decided Supreme Court case
Briefing
What it's about
The Supreme Court said ANILCA blocks the National Park Service from regulating John Sturgeon's hovercraft use on Alaska's Nation River as if that river were ordinary federal park land. The dispute was about whether nonfederal lands and waters inside Alaska park boundaries can be controlled the same way as federally owned park property.
Vote
The Court decided that ANILCA prevents the Park Service from treating the nonfederal Nation River like ordinary federal park land for this regulation, but the vote count and opinion lineup are not provided here.
Impact
This affects Alaskans who travel, hunt, fish, or use rivers that run through park boundaries but are owned by the state, Native corporations, or private parties. For example, it limits the Park Service's power over use of a nonfederal river inside an Alaska preserve.
What's next
The Supreme Court has finished this docket action. Its decision now controls this dispute over the Nation River and the Park Service's authority there.
What was the main fight in Sturgeon v. Frost?
The case asked whether ANILCA lets the Park Service regulate nonfederal lands and waters inside Alaska park boundaries like federal park land. That question arose from a ban on Sturgeon's hovercraft use on the Nation River.
Who is most affected by this decision in real life?
People in Alaska who use rivers and lands inside park boundaries but outside federal ownership are directly affected. That includes travelers, hunters, fishers, and some Native corporation or private land users.
What happens next after the Supreme Court's decision?
The Court's work in this docket is over. The decision now governs this dispute and future questions about Park Service control over similar nonfederal areas in Alaska parks.
Decision
What the Court decided
Inside Alaska park boundaries, nonfederal waters are not automatically subject to the Park Service's usual federal-park rules.
Impact
This affects Alaskans who travel, hunt, fish, or use rivers that run through park boundaries but are owned by the state, Native corporations, or private parties. For example, it limits the Park Service's power over use of a nonfederal river inside an Alaska preserve.
Not official Court text.
Opinion documents
Related cases




Grounding
- Grounding
- Primary materials plus reporting.
- Note
- Best-effort analysis: this explainer relies on a mix of primary materials and trusted secondary sources. Official filings and opinions remain authoritative.
- Checked
- Jul 2, 2026
- Method
- Methodology
Primary materials10
Supreme Court docket 17-949
docket | Jul 3, 2026
Primary case document
Supreme Court document | Jul 3, 2026
CourtListener docket record
docket | Jul 3, 2026
Questions Presented
brief | May 25, 2026
opinion
opinion | Mar 26, 2019
Petition
brief | Jan 2, 2018
SupremeCourt.gov
official | Jul 2, 2026
SupremeCourt.gov
official | Jul 2, 2026
SupremeCourt.gov
official | Jul 2, 2026
SupremeCourt.gov
official | Jul 2, 2026