  We study classical spin ice under uniaxial strain along the $[111]$
crystallographic axis. Remarkably, such strain preserves the extensive ice
degeneracy and the corresponding classical Coulomb phase. The emergent monopole
excitations remain thermodynamically deconfined exactly as in the isotropic
case. However, their motion under local heat bath dynamics depends
qualitatively on the sign of the strain. In the low-temperature limit for
negative strain, the monopoles diffuse, while for positive strain, they
localize. Introducing additional ring exchange dynamics into the ice background
transforms the localized monopoles into sub-dimensional excitations whose
motion is restricted to diffusion in the $(111)$-plane. The phenomena we
identify are experimentally accessible in rare-earth pyrochlores under uniaxial
pressure as well as in tripod kagome materials. The diffusive versus localized
nature of the monopoles manifests in characteristic magnetic noise spectra,
which we compute.
