Creep is recognized as rock salt's primary deformation mechanism. However, commonly used creep laws do not accurately predict creep at small deviatoric stresses, which dominate the behavior of salt structures given that the vast majority of the volume experiences small stresses. Including multiple creep law segments with progressively smaller stress exponents but larger coefficients, as expected for different stress regimes, can increase predicted volumetric closure rates around circular openings by a factor of 10 compared to using a single creep law segment. This better accounts for the requirement of strain compatibility whereby deformation must occur throughout the volume to avoid voids.