Geology & The 'Elbow' Itself
The Devils Elbow gets its name from the dramatic 90-degree bend in the Big Piney River, where the channel makes an almost-perfect right-angle turn before continuing northward toward its confluence with the Gasconade. This bend is one of the most pronounced river meanders in the Missouri Ozarks and is the result of millions of years of water erosion against differential rock layers in the limestone bedrock. The outside of the bend, where the river hits the resistant rock face directly, has carved a sharp curve; the inside of the bend has accumulated sand and gravel deposits in a typical point-bar formation.
From the overlook, the full geometry of the elbow is visible in a way that is not apparent from the bridge or river level. You can trace the river coming from the south (left, as you look at the view), see it slamming into the bluff and turning sharply, and follow it continuing northward (right). The bridge crosses the river just downstream of the elbow itself, where the channel has straightened slightly after the dramatic bend. The total drop from the overlook to the river is roughly 100-150 feet, depending on which overlook point you stand at.
The limestone bluffs that line both sides of the river bottom are part of the Roubidoux Formation — a 470-million-year-old dolomite and limestone unit that underlies much of central Missouri. The same rock formation produces the karst springs (including Roubidoux Spring in Waynesville) and the dramatic bluff scenery that defines much of the Ozark plateau. The bluffs at Devils Elbow are particularly photogenic because the rock is exposed in clean vertical faces with characteristic horizontal bedding planes visible.
