On 13 August 1947 a sky-blue disc was reported racing along a canyon near Twin Falls in Idaho, whipping the treetops as it went, and the same day two miners at Salmon Dam reported a pair of whirling discs like round mirrors. Both reports went into the Air Force files. This is the record of what was reported and filed, not a verdict on what crossed Idaho that day.
◆ THE SHORT VERSION
◆The Salmon Dam Discs is a reported UAP case in the USA, 13 August 1947.
◆The record describes a disc-shaped craft and a fast-moving object.
◆For this case Fractured Realities holds 1 distinct source, 8 corroborating primary documents and 7 distinct claimants on its resolved list.
◆The archive grades it L4 · DOC-CORROBORATED — the testimony is corroborated by primary government documents, the top of our scale.
Counts are resolved totals of what sources say, computed 2026-10-03; the reported details above are claims in the record, not findings. A record of reports, not a verdict on what happened.
EVENT DATE
13 August 1947
LOCATION
Salmon Dam / Twin Falls, Idaho · USA
COORDS
42.84°N 114.90°W
INDEPENDENCE
L4 · DOC-CORROBORATED
SOURCES
1 distinct
CLAIMANTS
7
STATUS
Government primary · DoW UAP Release
⤢
NUMBERS COMPUTED 2026-10-03 · RESOLVED COUNTS, NOT A VERDICT
Two reports from southern Idaho share a date, 13 August 1947, in the summer when such reports were arriving in numbers. At Twin Falls a sky-blue disc was described racing through a canyon low enough to whip the treetops, moving as though it were in a vacuum. At Salmon Dam on the same day two miners reported watching a pair of discs turning in the air, which they likened to round mirrors. The two sightings are held here as one entry.
What is on the record
This is a document-carried case. Eight government primary records sit in the file. Four come from Project Blue Book by way of the National Archives, and three of those name Salmon Dam and Twin Falls in Idaho in August 1947 directly, which ties the paperwork to these reports rather than merely to the period. Four further items come from the Department of War UAP release. The fourth Blue Book item is a July 1947 file from Black River Falls in Wisconsin, which does not belong to this event and is best read as era matching rather than corroboration.
The testimony side is thin by comparison. A single video on a single channel carries the story, and the two claimants it supplies are not people. They are listed as two miners and as canyon observers. The archive's count reaches seven only because five more names come from the paper records attached to the case: J. H. Brown, L. W. Hawkins, Sig Hanson, a Mr Young and a Mrs Frosterbrook. The archive has not established which sighting each of them belongs to.
That is the shape worth being straight about. The strength of the entry lies in the fact that the sightings were reported to the Air Force and written down at the time, not in the number or the quality of the witnesses the archive can reach. What the files record is that the reports were made, not what was in the air above the canyon.
Why it sits where it does
The case grades L4, the archive's document-corroborated tier, because official paperwork rather than retelling anchors it. It earns that on filing rather than on witnesses, and the distinction matters. What passed down the canyon at Twin Falls, and what the miners watched turning over Salmon Dam, is not resolved here.
