Two women were filmed walking on the microbial mats at Grand Prismatic Spring on July 20, and witness Kevin Dickerson photographed them and reported the incident to rangers; no ranger was on the boardwalk at the time, and as of July 22 their identities were still unresolved. [1]
That is not just a park-rule story. In Yellowstone's thermal areas, 36 CFR 7.13(j) bars foot travel outside maintained boardwalks, and the violation is prosecuted as a federal misdemeanor in U.S. District Court for Wyoming. [2]
What recent sentences look like
If the walkers are identified, charged, and convicted, the court is not starting from a blank page. Recent Yellowstone thermal-trespass cases show that the penalty can include jail, fines, probation, and park bans rather than a ticket alone. [3][4][5][6]
| Case | Outcome | What it shows |
|---|---|---|
| Pyshniuk (2024) | 7 days in jail, $1,550 in fines and costs, 2 years unsupervised probation, and a 3-year park ban. [3] | First modern jail sentence the park publicized for thermal trespass. |
| Bedient (2026) | 5 days in jail; reporting on the sentence says the magistrate judge cited damage to microbial mats as an aggravating factor. [4][5] | Clear example of resource damage affecting the court's view. |
| Pierce Brosnan case (2024) | $500 fine, with no custody. [6] | Baseline before the newer jail-time pattern. |
The older 2016 High On Life matter is useful only as a historical marker. Yellowstone sought a criminal complaint and arrest warrant after two men walked on Grand Prismatic Spring, but that episode did not produce the custody pattern now visible in the newer cases. [7]
Why the mats matter
Bedient matters because it ties the sentence to the resource itself. The reported aggravator was not simply that the defendant left the boardwalk, but that the walk damaged microbial mats, which are part of the living thermal feature rather than decorative scenery. [4][5]
That distinction is important for the July 20 case because the video shows the walk onto the spring's surface, not merely a moment near the edge. If prosecutors can connect that conduct to mat damage, the same aggravation argument is available. [1][4][5]
What happens if they are identified
The safest conclusion is conditional. If the two women are identified, charged, and convicted under 36 CFR 7.13(j), they face the same misdemeanor framework that has recently produced short jail terms, fines in the hundreds to over a thousand dollars, probation, and park bans. [2][3][4][5][6] The newer cases do not guarantee custody, but they make jail a real possibility rather than a theoretical maximum.
References
- Tourists Again Illegally Walk on Dangerous Grand Prismatic Spring in Yellowstone — Cowboy State Daily — July 20, 2026
- 36 CFR 7.13 — eCFR
- Yellowstone National Park visitors sentenced for thermal trespass — National Park Service — June 13, 2024
- Texas man receives jail time for walking off designated boardwalk in Yellowstone National Park — Oil City News — April 9, 2026
- Man gets jail time after walking hydrothermal features in Yellowstone National Park — National Parks Traveler
- Yellowstone National Park visitor fined for thermal trespass — National Park Service — 2024
- Criminal complaint, arrest warrant filed against men who walked on Grand Prismatic Spring — Yellowstone Insider — May 18, 2016
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