Grassy Lake and Grassy Lake Dam (GRS)
Grassy Lake Dam is a zoned earthfill storage dam on Grassy Creek in Wyoming near the southern boundary of Yellowstone National Park. The reservoir's storage capacity supplements the storage at Island Park Reservoir. Grassy Lake Dam was constructed from 1937 to 1939. Columbia Basin Teletype (CBTT) = GRS. Project: Minidoka Project. Region: Pacific Northwest. Elevation: 7201ft.
Overview
Grassy Lake Dam is a zoned earthfill storage dam on Grassy Creek in Wyoming near the southern boundary of Yellowstone National Park. The reservoir's storage capacity supplements the storage at Island Park Reservoir. Grassy Lake Dam was constructed from 1937 to 1939. Columbia Basin Teletype (CBTT) = GRS. Project: Minidoka Project. Region: Pacific Northwest. Elevation: 7201ft.
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Total: 45/100Risk Assessment
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Updated Apr 7, 2026Data is sourced from public and authoritative providers. Hi3 Water aggregates, normalizes, and scores records but does not assert ownership of underlying source data. Always verify critical details with the primary source before any decision.