It looks like there was a protective layer of masking tape around the hole
The Yugin Plaques website
Visitors get rare glimpse of Glory Hole spill at Whiskeytown Lake
Visitors get rare glimpse of Glory Hole spill at Whiskeytown Lake
1920-1929 – Alpine Club of Canada Vancouver Island Section
The Collective Magazines Celebrating the best our region has to
Monticello Dam - Wikipedia
1935 – 1939 – Alpine Club of Canada Vancouver Island Section
Yes, There Was Skiing Before We Built The Chairlift — Rossland
Full Brochure - STA Travel Hub
Against the Current and Into the Light: Performing History and
Redesigned: Standout Essays Archive - Ivy Scholars
The alleged glory hole in Strathcona Park has been fixed
Comox Valley Archives - The Collective Magazines
Rivers – OttawaVeloOutaouais