"On Sept. 2, an area north of downtown Juneau will hear a loud, discordant siren. Juneau’s power company will be testing a disaster plan for a scenario where the 168-foot Salmon Creek hydroelectric dam fails and floods a largely commercial district near the regional hospital.
“We do the siren test every year, but this is the big one,” Alaska Electric Light & Power Company executive Debbie Driscoll said. She’s in charge of community affairs for the utility company. She said the 2021 test is part of a five-year drill involving federal, state and local authorities.
“This provides a complete test of the emergency action plan to determine if the plan is adequate to deal with an emergency arising from a failure of the dam,” she said."