Between 1978 and 1986, the lake was filled with almost 10,000 hollow concrete blocks to prevent sediments from shifting. Conservation of the affected area continued into the 2000s via the federal target program "Nuclear and Radiation Safety in 2008 and for the period up to 2015", with the rest of the lake finally being backfilled in November 2015. Conservation work was completed in December 2016 with the final layer of rock and soil being added, effectively making the former lake "a near-surface permanent and dry nuclear waste storage facility."