Curtain Falls is a super clean 30' river wide granite ledge waterfall. The generally accepted standard line is to start right of a midstream boulder following a feature visible in the submerged bedrock called "The question mark" (due to its shape). This leads you faithfully over the blind roll off of the ledge to a hopefully safe landing. In general the current tries to move you left harder than expected and slight right boat angle is needed to nail the ideal line which falls off the right side of the smooth central tongue with a pencil or late boof, your back!, your choice!.