Put In is the initial access point for the Great Falls section of the Potomac, marking the start of a technically demanding and consequential run through narrow, boulder-strewn channels. Paddlers must carefully navigate the complex entry and be prepared for quick decision-making, as the rapid sets the tone for the challenging whitewater that follows. Precise boat positioning and a clean launch are critical, with limited margin for error due to the surrounding rocky terrain and potential hydraulic features.