This dataset provides estimates of the cumulative dextral shear in the Blythe region. Included in the dataset are descriptions of the fault location, features used to measure right separation, the magnitude of separation and the source of the estimate provided, as well as the timing constraints for individual faults. These datasets are associated with a manuscript accepted for publication: Mavor, S.P., Bennett, S.E.K., Crow, R.S., Singleton, J.S., Langenheim, V., Stockli, D., Stelten, M., Brickey, T.A., Sr., Umhoefer, P.J., and Beard, L.S., 2023, Evolution of Miocene normal and dextral faulting in the lower Colorado River region near Blythe, California, USA: Geosphere, v. 19, https://doi.org/10.1130/GES02608.1.