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I appreciate your detailed query, but I must clarify a critical geographic and factual issue before proceeding.
**The query conflates two entirely separate locations that cannot be combined:**
1. **Barrage de Montsalvens** is located in the Gruyère region of **Fribourg, Switzerland**—a European alpine dam built 1918–1921, featuring the first double-curvature arch dam architecture on the continent.
2. **Koyna Dam** is located in **Maharashtra, India**—a concrete gravity dam on the Koyna River in the Western Ghats, built in 1963.
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