This document provides a description of data available to support water quality modeling in the Truckee River Basin (DSAMMt model). Conditions within the Truckee Basin have changed considerably throughout the 19th century (beaver importation, riparian tree removal, channelization, flow diversion for agriculture, flood control, Marble Bluff Dam, grazing, flow augmentation, riparian restoration, etc.). Future changes are expected associated with river operations, flood control, and channel restoration