GG-2026-121
Patterson-Gimlin Film
- Phenomenon Cryptids & Unknown Zoology
- Documentation
Rating B
- A — Strong dossier: several independent sources plus primary evidence (original media, records, measurements) a researcher could use without interviewing anyone.
- B — Well documented: multiple independent witnesses with at least some contemporary primary material, or one witness with substantial primary corroboration (photos, recordings, contemporaneous notes, documents).
- C — Multi-source but soft: several witnesses or a long run of reports, but mostly testimony and after-the-fact secondary sources (newspapers, folklore collections, later interviews). Little or no primary physical evidence. Regional legend clusters such as the Bridgewater Triangle land here.
- D — Thin: single witness (or one household), little or no support beyond the account. Normal for a sincere personal experience.
- E — Incomplete or not yet assessed. Every new submission starts here until staff have read it.
- Evidence & media 2 items
- Status Historic
- Location Bluff Creek, Klamath National Forest, California
- Occurred 20 October 1967
Summary
On October 20, 1967, film maker Roger Patterson and his companion Bob Gimlin captured 59 seconds of 16mm color motion picture footage of a large, upright, bipedal ape-like creature walking away across a gravel bar along Bluff Creek in Northern California. The resulting footage—featuring the famous "Frame 352" pivot where the figure turns to glare at the camera—became the foundational visual anchor for the modern Bigfoot legend. For nearly six decades, the film has divided researchers, zoologists, and skeptics. Proponents point to alleged anatomical details, distinct muscle flexion, and biomechanical eccentricities difficult to replicate in a costume, while critics argue financial motives, prior docudrama plans, and persistent confessions or costume claims point to an elaborate hoax.
Background
he Encounter at Bluff Creek (October 20, 1967)
The Expedition: Roger Patterson, an amateur enthusiast fascinated by Sasquatch lore, and Bob Gimlin had been tracking reports of large footprints in the Bluff Creek area of Northern California for several days.
The Sighting: Around 1:30 PM, while riding horses along a creek bed strewn with logging debris, their mounts panicked. Patterson spotted a large, covered-in-hair bipedal figure standing near the timberline. Dismounting rapidly and losing his horse, Patterson grabbed his Kodak K-100 16mm camera loaded with Kodachrome II color film and sprinted toward the creature, shouting at Gimlin to follow with the horses.
The Action: The subject—dubbed "Patty"—walked with a deliberate, heavy stride across the creek bar, pausing once at roughly 100 feet to look directly back at the camera before disappearing into the dense timber. The entire sequence lasted less than a minute.
Timeline of the Patterson-Gimlin Archive
├── Oct 20, 1967 : Patterson & Gimlin capture 59 seconds of 16mm footage at Bluff Creek.
├── Late 1967 : Film processed in Yakima/Seattle; distributed to media and investigators (DeAtley).
├── 1968–1970s : Initial independent analyses by cryptozoologists (Iles, Green, Napier).
├── 1990s–2000s : Digital frame scanning, muscle-structure studies, and costume fabrication claims.
└── Present : Ongoing debate balancing archival provenance against hoax disclosures.
Chain of Custody & Distribution
The Processing: Patterson rushed the camera original to Yakima, Washington, before having it processed at a lab in Seattle. Copies were quickly acquired by investigator John Green and financier Al DeAtley.
Commercial Exploitation: Patterson immediately turned the footage into a traveling slideshow and roadshow attraction to fund his broader documentary projects, establishing a financial incentive that critics have used for decades to challenge its credibility.
Witness statement
No statement on file.
Investigation timeline
- 2026-10-10 — Historical file submitted.
- 2026-10-10 — Historical file accepted and published.
Research notes
Historical research: Biomechanical & Morphological Arguments (The Pro-Authenticity View)
Researchers who argue the film depicts a genuine unknown primate emphasize several physical traits:
Muscular Articulation: Independent analyses (notably by anatomist Dr. Jeff Meldrum and various physical anthropologists) point to visible calf muscle flexing, gluteal movement, and skin sagging over bone structures that were difficult or impossible to engineer with 1967 consumer-grade furs and latex.
Proportions and Gait: The subject exhibited an unusually long arm-to-leg ratio, a compliant, bent-knee stride (the "variable-compliance" gait), and a wide, flat-footed trackway that biomechanical engineers noted would require unnatural physical strain for a human actor wearing standard stilt-rigs or bulky suits.
Historical research: The Hoax & Fabrication Hypothesis (The Skeptical View)
Skeptics and historical investigators focus on human context rather than biological anomaly:
Prior Commercial Ambitions: Prior to the October encounter, Patterson had been actively writing a book and shooting footage for a planned Hollywood-backed docudrama about Bigfoot, creating a clear motive to manufacture definitive evidence.
Costume and Confession Claims: Over the years, multiple individuals—including acquaintance Bob Heironimus—claimed to have worn a custom-built monkey or gorilla suit (allegedly sourced or modified from costume makers) during the filming session.
The Technology Gap: Critics argue that 1967 film stock resolution, motion blur, and distance obscure fine details, allowing imaginative observers to project complex anatomy onto what was essentially a well-crafted cinematic prank or costumed actor.
Propose evidence & media, a source citation, further reading, a research note, a related case, or a series link. Staff review before anything is added.