According to the UTAH GEOLOGIC SURVEY (UGS) and as you can see, Panguitch Dam was built on a very substantial concealed gravity fault. The fault is located on the east side of the dam in the formation noted as TM or the Markagunt Gravity Slide. According to the UGS the gravity slide fault exceeds 2000' thick in some locations.
Most Dams are designed with the curvature of the dam crest towards the pressure side (the lake) not the other direction.
A crack spotted in the early morning hours after a local earthquake shows geologic activity is present.
There is a large separation line where the curtain wall attaches and nests to the native laminated rock formation. At high water just prior and subsequent to water flowing over the crest of the dam, a significant amount of seepage water flows through the separation line at the laminated formation.
As you can see there is a separation line just above the water line in this picture where water seeps to the other side-also prior patching where the cobble nests into the existing fractured rock formation. The cobble appears to be laid in lifts with an unconsolidated concrete cap. Hopefully in each lift there is steel reinforcement but after fifty years of operation, that steel reinforcement should have been epoxy coated to resist rust and corrosion which technically wasn't available at the time of dam construction.