USGS recently published a U.S. Fish and Wildlife dataset about invasive tamarisk species occurrences in select tributaries of the Colorado River Basin from data collected in 2014 and 2017. The study encompasses the U.S. portion of the River and were collected by a research team from Colorado State University’s Natural Resources Ecology Laboratory. The dataset consists of 1,575 records of the genus Tamarix.
More can be found about the study that was derived from these data here: https://mountainscholar.org/handle/10217/187177.