Evacuations are being conducted throughout the town of Twain Hart after a large boom was heard and cracks appeared in the nearby dam. Tuolumne County Sheriff Deputies investigated after loud "explosions" were heard just after noon. A sheriff's spokesperson says there is no evidence of an explosion and that crews are actively working to lower lake levels. Good Shepherd Drive and Lucky Strike Trail in Upper Crystal are the areas currently being evacuated but there is no threat to the county as a whole, according to the Sheriff's office. KCRA reports the dam was built in 1928 and is now owned by the Twain Hart Lake Association, Inc. The dam is 36 feet high was a crest of 325 feet in length. Back in September of 2021, the Twain Hart dam made the list of state dams at satisfactory performance with no restrictions.