  We present a measurement of the cosmic-ray spectrum above 100\,PeV using the
part of the surface detector of the Pierre Auger Observatory that has a spacing
of 750~m. An inflection of the spectrum is observed, confirming the presence of
the so-called \emph{second-knee} feature. The spectrum is then combined with
that of the 1500\,m array to produce a single measurement of the flux, linking
this spectral feature with the three additional breaks at the highest energies.
The combined spectrum, with an energy scale set calorimetrically via
fluorescence telescopes and using a single detector type, results in the most
statistically and systematically precise measurement of spectral breaks yet
obtained. These measurements are critical for furthering our understanding of
the highest energy cosmic rays.
