This class covers a broad spectrum of river modeling techniques within the International River Interface Cooperative (iRIC) public-domain modeling interface. The course will be taught in a workshop format starting with basic data input and stepping through the processes of grid generation, model execution, visualization, and verification. The interface incorporates a variety of computational modeling approaches including finite difference and finite volume models using both structured and unstructured coordinate systems; only a subset of the available techniques will be covered in this short class. Basic principles will be briefly covered, but the emphasis of this short course is hands-on application using data sets for realistic problems on real rivers. For the class in Golden, the students will learn and use the following: FaSTMECH, Nays2dh, Nays2dFlood, and more. The class will be taught by Jonathan Nelson and Scott Charlton. All software and the class are freely available. Contact Jonathan Nelson (jmn@usgs.gov) for enrollment. Space is strictly limited to 16 students as this class will be taught at the GSTL facility in Golden.