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Eric Thomas Grigg — Idaho fishing guide or outfitter.
Best Season
May – October
Best Season
The seasons when this guide most often runs trips.
Group Size
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Group Size
Typical number of guests on a trip with this guide.
Primary Waters
Idaho waters
Primary Waters
Regions where this guide primarily operates within.
Skill Level
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Skill Level
The angler XP level best suited for trips with this guide.
Guiding Experience
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Guiding Experience
How long this guide has been guiding professionally.
Eric Thomas Grigg grew up in Soda Springs, Idaho, where he developed a passion for fly-fishing from an early age under his mother's instruction. He earned a degree in Biotechnology from Montana State University while maintaining his dedication to fishing, which eventually led him to join Three Rivers Ranch as a guide in 2003. Grigg has extensive experience on southeast Idaho's premier waters, particularly the South Fork of the Snake River where he spent his formative years fishing, and he also guides on the lower Henry's Fork. Based in Ashton, Idaho, he values the collaborative culture at Three Rivers Ranch and frequently fishes during his free time and off-season months.
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Ashton, ID
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An official Idaho outfitter/guide license is on file for this provider.
Sourced from official Idaho Board of Outfitters & Guides license records. This listing has not yet been claimed by the provider. Last updated August 16, 2026.