35 / 100

Mostly False Montana USA

Lake Floodhead is described as a transparent and large lake in Montana, USA, with an area of 510 square kilometers and a depth of 100 meters.

Q: Is it true that Lake Floodhead is described as a transparent and large lake in Montana, USA, with an area of 510 square kilometers and a depth of 100 meters.?

Mostly False. The examination of the claims about Lake Floodhead involves mixed results. While there is evidence to support the high transparency of a similar lake, Flathead Lake, the claim about it being one of the most transparent lakes in the world lacks direct corroborative evidence. The claim about being the largest body of water in America is false, with Lake Superior holding that title. The reported area of 510 square kilometers for Lake Floodhead is not supported by the evidence, which shows a slightly smaller size of 495.9 square kilometers. Additionally, there is no evidence confirmi

Infact verdict: Mostly False (35/100).

The examination of the claims about Lake Floodhead involves mixed results. While there is evidence to support the high transparency of a similar lake, Flathead Lake, the claim about it being one of the most transparent lakes in the world lacks direct corroborative evidence. The claim about being the largest body of water in America is false, with Lake Superior holding that title. The reported area of 510 square kilometers for Lake Floodhead is not supported by the evidence, which shows a slightly smaller size of 495.9 square kilometers. Additionally, there is no evidence confirming the specific depth of Lake Floodhead. Finally, the location of Lake Floodhead in Montana is consistent with the evidence citing it is formed from Glacial Lake Missoula influences. Overall, several claims were inconsistent with evidence, pointing to inaccuracies in descriptions regarding the size and status of the lake.

March 18, 2026 Language: en 5 claims analyzed

How is this score determined? →

60

Mostly True Natural Features

Lake Floodhead is one of the most transparent lakes in the world.

The evidence suggests that Flathead Lake is known for its transparency, often cited for its clarity. However, there is no direct evidence in the retrieval supporting Lake Floodhead's specific status as one of the most transparent lakes globally.

Fact Check Score None

Fact Check Weight 0

Web Consensus Score 60

Web Consensus Weight 50

Source Quality Score 60

Source Quality Weight 25

Llm Reasoning Score 60

Llm Reasoning Weight 25

Weighted Total 60

Evidence Summary No fact-check, indirect evidence on Flathead Lake transparency.

Sources flbs.umt.edu flatheadlakers.org www3.uwsp.edu

12

False Geography

Lake Floodhead is the largest body of water in America.

Multiple high-reliability sources confirm Lake Superior is the largest body of water in America, contradicting the claim about Lake Floodhead.

Fact Check Score None

Fact Check Weight 0

Web Consensus Score 0

Web Consensus Weight 50

Source Quality Score 0

Source Quality Weight 25

Llm Reasoning Score 0

Llm Reasoning Weight 25

Weighted Total 12

Evidence Summary Multiple sources confirm Lake Superior is the largest.

Sources worldatlas.com en.wikipedia.org science.howstuffworks.com

42

Mixed Geography

Lake Floodhead has an area of 510 square kilometers.

Evidence shows Lake Floodhead (likely confused with Flathead Lake) has an area of 495.9 square kilometers. The claim of 510 square kilometers is inaccurate.

Fact Check Score None

Fact Check Weight 0

Web Consensus Score 40

Web Consensus Weight 50

Source Quality Score 40

Source Quality Weight 25

Llm Reasoning Score 40

Llm Reasoning Weight 25

Weighted Total 42

Evidence Summary Lake size reported as 495.9 km².

Sources flbs.umt.edu en.wikipedia.org youtube.com

50

Mixed Natural Features

Lake Floodhead has a depth of up to 100 meters.

There is no available evidence to confirm or refute the specific depth of Lake Floodhead at 100 meters. More data is needed for verification.

Fact Check Score None

Fact Check Weight 0

Web Consensus Score 50

Web Consensus Weight 50

Source Quality Score 50

Source Quality Weight 25

Llm Reasoning Score 50

Llm Reasoning Weight 25

Weighted Total 50

Evidence Summary No depth-specific evidence found.

Sources ccalculators.co.uk waterdatafortexas.org trinityra.org

11

False Geography

Lake Floodhead is located in Montana, USA.

Fact Check Score None

Fact Check Weight 0

Web Consensus Score None

Web Consensus Weight 0

Source Quality Score None

Source Quality Weight 0

Llm Reasoning Score -1

Llm Reasoning Weight 100

Weighted Total 11

Evidence Summary None

Lake Floodhead is described as a transparent and large lake in Montana, USA, with an area of 510 square kilometers and a depth of 100 meters.

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